PDB Short entry for 1XL4
HEADER    METAL TRANSPORT                         30-SEP-04   1XL4              
TITLE     INTERMEDIATE GATING STRUCTURE 1 OF THE INWARDLY RECTIFYING K+ CHANNEL 
TITLE    2 KIRBAC3.1                                                            
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: INWARD RECTIFIER POTASSIUM CHANNEL;                        
COMPND   3 CHAIN: A, B;                                                         
COMPND   4 SYNONYM: INWARDLY RECTIFYING K+ CHANNEL KIRBAC3.1, COG1226: KEF-TYPE 
COMPND   5 K+ TRANSPORT SYSTEMS, PREDICTED NAD-BINDING COMPONENT;               
COMPND   6 ENGINEERED: YES                                                      
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: MAGNETOSPIRILLUM MAGNETOTACTICUM;               
SOURCE   3 ORGANISM_TAXID: 188;                                                 
SOURCE   4 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   5 EXPRESSION_SYSTEM_TAXID: 562;                                        
SOURCE   6 EXPRESSION_SYSTEM_STRAIN: BL-21(DE3)STAR;                            
SOURCE   7 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID;                              
SOURCE   8 EXPRESSION_SYSTEM_PLASMID: PET-30A                                   
KEYWDS    INTEGRAL MEMBRANE PROTEIN, ION CHANNEL, INWARDLY RECTIFYING K+        
KEYWDS   2 CHANNEL, METAL TRANSPORT                                             
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    J.M.GULBIS,A.KUO,B.SMITH,D.A.DOYLE,A.EDWARDS,C.ARROWSMITH,M.SUNDSTROM 
REVDAT   3   13-JUL-11 1XL4    1       VERSN                                    
REVDAT   2   24-FEB-09 1XL4    1       VERSN                                    
REVDAT   1   07-DEC-04 1XL4    0                                                
JRNL        AUTH   J.M.GULBIS,A.KUO,B.SMITH,D.A.DOYLE,A.EDWARDS,C.ARROWSMITH,   
JRNL        AUTH 2 M.SUNDSTROM                                                  
JRNL        TITL   TWO INTERMEDIATE GATING STATE CRYSTAL STRUCTURES OF THE      
JRNL        TITL 2 KIRBAC3.1 K+ CHANNEL                                         
JRNL        REF    TO BE PUBLISHED                                              
JRNL        REFN                                                                
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.60 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : X-PLOR                                               
REMARK   3   AUTHORS     : BRUNGER                                              
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.60                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 12.00                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 3.000                          
REMARK   3   DATA CUTOFF HIGH         (ABS(F)) : NULL                           
REMARK   3   DATA CUTOFF LOW          (ABS(F)) : NULL                           
REMARK   3   COMPLETENESS (WORKING+TEST)   (%) : NULL                           
REMARK   3   NUMBER OF REFLECTIONS             : 27724                          
REMARK   3                                                                      
REMARK   3  FIT TO DATA USED IN REFINEMENT.                                     
REMARK   3   CROSS-VALIDATION METHOD          : BRUNGER                         
REMARK   3   FREE R VALUE TEST SET SELECTION  : RANDOM                          
REMARK   3   R VALUE            (WORKING SET) : 0.226                           
REMARK   3   FREE R VALUE                     : 0.253                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 5.000                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 1525                            
REMARK   3   ESTIMATED ERROR OF FREE R VALUE  : NULL                            
REMARK   3                                                                      
REMARK   3  FIT IN THE HIGHEST RESOLUTION BIN.                                  
REMARK   3   TOTAL NUMBER OF BINS USED           : NULL                         
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : NULL                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : NULL                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : NULL                         
REMARK   3   REFLECTIONS IN BIN    (WORKING SET) : NULL                         
REMARK   3   BIN R VALUE           (WORKING SET) : NULL                         
REMARK   3   BIN FREE R VALUE                    : NULL                         
REMARK   3   BIN FREE R VALUE TEST SET SIZE  (%) : NULL                         
REMARK   3   BIN FREE R VALUE TEST SET COUNT     : NULL                         
REMARK   3   ESTIMATED ERROR OF BIN FREE R VALUE : NULL                         
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 4487                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 6                                       
REMARK   3   SOLVENT ATOMS            : 180                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : NULL                           
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : NULL                           
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : -3.75200                                             
REMARK   3    B22 (A**2) : -3.71400                                             
REMARK   3    B33 (A**2) : 7.46600                                              
REMARK   3    B12 (A**2) : 0.00000                                              
REMARK   3    B13 (A**2) : 0.00000                                              
REMARK   3    B23 (A**2) : 0.00000                                              
REMARK   3                                                                      
REMARK   3  ESTIMATED COORDINATE ERROR.                                         
REMARK   3   ESD FROM LUZZATI PLOT        (A) : NULL                            
REMARK   3   ESD FROM SIGMAA              (A) : NULL                            
REMARK   3   LOW RESOLUTION CUTOFF        (A) : NULL                            
REMARK   3                                                                      
REMARK   3  CROSS-VALIDATED ESTIMATED COORDINATE ERROR.                         
REMARK   3   ESD FROM C-V LUZZATI PLOT    (A) : NULL                            
REMARK   3   ESD FROM C-V SIGMAA          (A) : NULL                            
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.                                   
REMARK   3   BOND LENGTHS                 (A) : 0.007                           
REMARK   3   BOND ANGLES            (DEGREES) : NULL                            
REMARK   3   DIHEDRAL ANGLES        (DEGREES) : NULL                            
REMARK   3   IMPROPER ANGLES        (DEGREES) : NULL                            
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL MODEL : NULL                                      
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.    RMS    SIGMA                
REMARK   3   MAIN-CHAIN BOND              (A**2) : 1.695 ; 1.500                
REMARK   3   MAIN-CHAIN ANGLE             (A**2) : 2.086 ; 2.000                
REMARK   3   SIDE-CHAIN BOND              (A**2) : 2.972 ; 2.000                
REMARK   3   SIDE-CHAIN ANGLE             (A**2) : 3.243 ; 2.500                
REMARK   3                                                                      
REMARK   3  NCS MODEL : NULL                                                    
REMARK   3                                                                      
REMARK   3  NCS RESTRAINTS.                         RMS   SIGMA/WEIGHT          
REMARK   3   GROUP  1  POSITIONAL            (A) : NULL  ; NULL                 
REMARK   3   GROUP  1  B-FACTOR           (A**2) : NULL  ; NULL                 
REMARK   3                                                                      
REMARK   3  PARAMETER FILE  1  : NULL                                           
REMARK   3  TOPOLOGY FILE  1   : NULL                                           
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: NULL                                      
REMARK   4                                                                      
REMARK   4 1XL4 COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBJ ON 05-OCT-04.                  
REMARK 100 THE RCSB ID CODE IS RCSB030479.                                      
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : NULL                               
REMARK 200  TEMPERATURE           (KELVIN) : NULL                               
REMARK 200  PH                             : 7.6                                
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : NULL                               
REMARK 200  RADIATION SOURCE               : NULL                               
REMARK 200  BEAMLINE                       : NULL                               
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : NULL                               
REMARK 200  MONOCHROMATOR                  : NULL                               
REMARK 200  OPTICS                         : NULL                               
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : NULL                               
REMARK 200  DETECTOR MANUFACTURER          : NULL                               
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : MOSFLM                             
REMARK 200  DATA SCALING SOFTWARE          : CCP4 (SCALA)                       
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 29551                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.600                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 26.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : NULL                               
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : NULL                               
REMARK 200  DATA REDUNDANCY                : NULL                               
REMARK 200  R MERGE                    (I) : NULL                               
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : NULL                               
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : NULL                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : NULL                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : NULL                               
REMARK 200  DATA REDUNDANCY IN SHELL       : NULL                               
REMARK 200  R MERGE FOR SHELL          (I) : NULL                               
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : NULL                               
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH                              
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: CNS                                                   
REMARK 200 STARTING MODEL: PDB ENTRY 1P7B                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 65.00                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 3.80                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: 90MM HEPES, 2.5% PEG 8000, 2.5% PEG      
REMARK 280  4000, 20% PEG 400, 12.5MM MAGNESIUM CHLORIDE, 42.5MM MAGNESIUM      
REMARK 280  ACETATE, 2.5% GLYCEROL, 14MM HEGA-10, PH 7.6, VAPOR DIFFUSION,      
REMARK 280  SITTING DROP, TEMPERATURE 293K                                      
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 2                        
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X,-Y,Z                                                 
REMARK 290       3555   -X+1/2,Y+1/2,-Z                                         
REMARK 290       4555   X+1/2,-Y+1/2,-Z                                         
REMARK 290                                                                      
REMARK 290     WHERE NNN -> OPERATOR NUMBER                                     
REMARK 290           MMM -> TRANSLATION VECTOR                                  
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS                            
REMARK 290 THE FOLLOWING TRANSFORMATIONS OPERATE ON THE ATOM/HETATM             
REMARK 290 RECORDS IN THIS ENTRY TO PRODUCE CRYSTALLOGRAPHICALLY                
REMARK 290 RELATED MOLECULES.                                                   
REMARK 290   SMTRY1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   1  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   2 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   2  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   3 -1.000000  0.000000  0.000000       52.81350            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       54.69250            
REMARK 290   SMTRY3   3  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   4  1.000000  0.000000  0.000000       52.81350            
REMARK 290   SMTRY2   4  0.000000 -1.000000  0.000000       54.69250            
REMARK 290   SMTRY3   4  0.000000  0.000000 -1.000000        0.00000            
REMARK 290                                                                      
REMARK 290 REMARK: NULL                                                         
REMARK 300                                                                      
REMARK 300 BIOMOLECULE: 1                                                       
REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM                
REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN                  
REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON               
REMARK 300 BURIED SURFACE AREA.                                                 
REMARK 350                                                                      
REMARK 350 COORDINATES FOR A COMPLETE MULTIMER REPRESENTING THE KNOWN           
REMARK 350 BIOLOGICALLY SIGNIFICANT OLIGOMERIZATION STATE OF THE                
REMARK 350 MOLECULE CAN BE GENERATED BY APPLYING BIOMT TRANSFORMATIONS          
REMARK 350 GIVEN BELOW.  BOTH NON-CRYSTALLOGRAPHIC AND                          
REMARK 350 CRYSTALLOGRAPHIC OPERATIONS ARE GIVEN.                               
REMARK 350                                                                      
REMARK 350 BIOMOLECULE: 1                                                       
REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: TETRAMERIC                        
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TETRAMERIC                 
REMARK 350 SOFTWARE USED: PISA,PQS                                              
REMARK 350 TOTAL BURIED SURFACE AREA: 21070 ANGSTROM**2                         
REMARK 350 SURFACE AREA OF THE COMPLEX: 50790 ANGSTROM**2                       
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -128.0 KCAL/MOL                       
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B                                  
REMARK 350   BIOMT1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT3   1  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT1   2 -1.000000  0.000000  0.000000      105.62700            
REMARK 350   BIOMT2   2  0.000000 -1.000000  0.000000     -109.38500            
REMARK 350   BIOMT3   2  0.000000  0.000000  1.000000        0.00000            
REMARK 375                                                                      
REMARK 375 SPECIAL POSITION                                                     
REMARK 375 THE FOLLOWING ATOMS ARE FOUND TO BE WITHIN 0.15 ANGSTROMS            
REMARK 375 OF A SYMMETRY RELATED ATOM AND ARE ASSUMED TO BE ON SPECIAL          
REMARK 375 POSITIONS.                                                           
REMARK 375                                                                      
REMARK 375 ATOM RES CSSEQI                                                      
REMARK 375      HOH B2002  LIES ON A SPECIAL POSITION.                          
REMARK 375 K      K A1000  LIES ON A SPECIAL POSITION.                          
REMARK 375 K      K A1001  LIES ON A SPECIAL POSITION.                          
REMARK 375 K      K A1003  LIES ON A SPECIAL POSITION.                          
REMARK 375 K      K A1004  LIES ON A SPECIAL POSITION.                          
REMARK 375 MG    MG A2001  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A2002  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A2003  LIES ON A SPECIAL POSITION.                          
REMARK 375 K      K A1002  LIES ON A SPECIAL POSITION.                          
REMARK 465                                                                      
REMARK 465 MISSING RESIDUES                                                     
REMARK 465 THE FOLLOWING RESIDUES WERE NOT LOCATED IN THE                       
REMARK 465 EXPERIMENT. (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN               
REMARK 465 IDENTIFIER; SSSEQ=SEQUENCE NUMBER; I=INSERTION CODE.)                
REMARK 465                                                                      
REMARK 465   M RES C SSSEQI                                                     
REMARK 465     MET A     1                                                      
REMARK 465     THR A     2                                                      
REMARK 465     GLY A     3                                                      
REMARK 465     GLY A     4                                                      
REMARK 465     MET A     5                                                      
REMARK 465     LYS A     6                                                      
REMARK 465     PRO A     7                                                      
REMARK 465     PRO A     8                                                      
REMARK 465     ALA A     9                                                      
REMARK 465     ARG A    10                                                      
REMARK 465     HIS A   300                                                      
REMARK 465     HIS A   301                                                      
REMARK 465     MET B     1                                                      
REMARK 465     THR B     2                                                      
REMARK 465     GLY B     3                                                      
REMARK 465     GLY B     4                                                      
REMARK 465     MET B     5                                                      
REMARK 465     LYS B     6                                                      
REMARK 465     PRO B     7                                                      
REMARK 465     PRO B     8                                                      
REMARK 465     ALA B     9                                                      
REMARK 465     ARG B    10                                                      
REMARK 465     LYS B    11                                                      
REMARK 465     PRO B    12                                                      
REMARK 465     ARG B    13                                                      
REMARK 465     ILE B    14                                                      
REMARK 465     LEU B    15                                                      
REMARK 465     ASN B    16                                                      
REMARK 465     SER B    17                                                      
REMARK 465     ASP B    18                                                      
REMARK 465     GLY B    19                                                      
REMARK 465     SER B    20                                                      
REMARK 465     SER B    21                                                      
REMARK 465     ASN B    22                                                      
REMARK 465     HIS B   300                                                      
REMARK 465     HIS B   301                                                      
REMARK 470                                                                      
REMARK 470 MISSING ATOM                                                         
REMARK 470 THE FOLLOWING RESIDUES HAVE MISSING ATOMS (M=MODEL NUMBER;           
REMARK 470 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER;          
REMARK 470 I=INSERTION CODE):                                                   
REMARK 470   M RES CSSEQI  ATOMS                                                
REMARK 470     LYS A  11    CG   CD   CE   NZ                                   
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: TORSION ANGLES                                             
REMARK 500                                                                      
REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS:            
REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER;               
REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE).                             
REMARK 500                                                                      
REMARK 500 STANDARD TABLE:                                                      
REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2)                    
REMARK 500                                                                      
REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI-           
REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400            
REMARK 500                                                                      
REMARK 500  M RES CSSEQI        PSI       PHI                                   
REMARK 500    LEU A  28      103.64    -37.75                                   
REMARK 500    LYS A  30      -99.97    -51.20                                   
REMARK 500    ASP A  36     -110.39    -71.39                                   
REMARK 500    VAL A  44      169.79    -49.47                                   
REMARK 500    ILE A 103      146.94    -23.41                                   
REMARK 500    PRO A 104     -179.76    -63.08                                   
REMARK 500    GLU A 188       13.64    -69.36                                   
REMARK 500    LEU A 210      -90.15   -118.46                                   
REMARK 500    THR A 276     -158.05   -115.71                                   
REMARK 500    ALA A 284      122.78   -176.73                                   
REMARK 500    LEU A 287        1.70    -64.91                                   
REMARK 500    LEU B  28       66.13   -161.33                                   
REMARK 500    ARG B  31      172.59     49.50                                   
REMARK 500    ASP B  36     -161.75    -69.15                                   
REMARK 500    HIS B  37       37.70    -79.01                                   
REMARK 500    VAL B  44      158.90    -41.13                                   
REMARK 500    ASP B  73       68.71   -105.55                                   
REMARK 500    ILE B 103      160.80    -32.76                                   
REMARK 500    PRO B 107      -38.32    -30.42                                   
REMARK 500    GLU B 188        4.34    -66.62                                   
REMARK 500    LEU B 210      -93.70   -115.61                                   
REMARK 500    ASP B 280       61.62   -109.42                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 525                                                                      
REMARK 525 SOLVENT                                                              
REMARK 525                                                                      
REMARK 525 THE SOLVENT MOLECULES HAVE CHAIN IDENTIFIERS THAT                    
REMARK 525 INDICATE THE POLYMER CHAIN WITH WHICH THEY ARE MOST                  
REMARK 525 CLOSELY ASSOCIATED. THE REMARK LISTS ALL THE SOLVENT                 
REMARK 525 MOLECULES WHICH ARE MORE THAN 5A AWAY FROM THE                       
REMARK 525 NEAREST POLYMER CHAIN (M = MODEL NUMBER;                             
REMARK 525 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE                  
REMARK 525 NUMBER; I=INSERTION CODE):                                           
REMARK 525                                                                      
REMARK 525  M RES CSSEQI                                                        
REMARK 525    HOH B2022        DISTANCE =  5.68 ANGSTROMS                       
REMARK 600                                                                      
REMARK 600 HETEROGEN                                                            
REMARK 600 THERE ARE TWO ALTERNATE ARRANGEMENTS OF IONS AND                     
REMARK 600 COORDINATED WATER MOLECULES.                                         
REMARK 600 THE FIRST INCLUDES K(A1001), K(A1003), HOH(A2002),                   
REMARK 600 MG(A2001) AND HOH(B2002).                                            
REMARK 600 THE SECOND INCLUDES K(A1002), K(A1004) AND HOH(A2003).               
REMARK 620                                                                      
REMARK 620 METAL COORDINATION                                                   
REMARK 620 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER;               
REMARK 620 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE):                             
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                               K A1004   K                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 THR A  96   O                                                      
REMARK 620 2 THR A  96   OG1  60.1                                              
REMARK 620 3 THR B  96   O    77.4  97.7                                        
REMARK 620 4 THR B  96   OG1 116.3  79.4  60.7                                  
REMARK 620 N                    1     2     3                                   
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A2001  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 THR A  96   OG1                                                    
REMARK 620 2 THR B  96   OG1  92.1                                              
REMARK 620 3 HOH B2002   O    96.8 100.1                                        
REMARK 620 N                    1     2                                         
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                               K A1003   K                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 ILE A  97   O                                                      
REMARK 620 2 ILE B  97   O    85.9                                              
REMARK 620 3 HOH A2002   O   109.5 107.4                                        
REMARK 620 N                    1     2                                         
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                               K A1002   K                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 GLY A  98   O                                                      
REMARK 620 2 TYR A  99   O    64.8                                              
REMARK 620 3 TYR B  99   O    85.6  86.0                                        
REMARK 620 4 HOH A2003   O    50.4 110.2 109.6                                  
REMARK 620 N                    1     2     3                                   
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE K A 1002                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC2                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE K A 1003                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC3                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE K A 1004                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC4                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 2001                 
DBREF  1XL4 A    5   295  GB     46201166 ZP_00055625      1    291             
DBREF  1XL4 B    5   295  GB     46201166 ZP_00055625      1    291             
SEQADV 1XL4 MET A    1  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 THR A    2  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 GLY A    3  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 GLY A    4  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS A  296  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS A  297  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS A  298  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS A  299  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS A  300  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS A  301  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 MET B    1  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 THR B    2  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 GLY B    3  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 GLY B    4  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS B  296  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS B  297  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS B  298  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS B  299  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS B  300  GB   46201166            EXPRESSION TAG                 
SEQADV 1XL4 HIS B  301  GB   46201166            EXPRESSION TAG                 
SEQRES   1 A  301  MET THR GLY GLY MET LYS PRO PRO ALA ARG LYS PRO ARG          
SEQRES   2 A  301  ILE LEU ASN SER ASP GLY SER SER ASN ILE THR ARG LEU          
SEQRES   3 A  301  GLY LEU GLU LYS ARG GLY TRP LEU ASP ASP HIS TYR HIS          
SEQRES   4 A  301  ASP LEU LEU THR VAL SER TRP PRO VAL PHE ILE THR LEU          
SEQRES   5 A  301  ILE THR GLY LEU TYR LEU VAL THR ASN ALA LEU PHE ALA          
SEQRES   6 A  301  LEU ALA TYR LEU ALA CYS GLY ASP VAL ILE GLU ASN ALA          
SEQRES   7 A  301  ARG PRO GLY SER PHE THR ASP ALA PHE PHE PHE SER VAL          
SEQRES   8 A  301  GLN THR MET ALA THR ILE GLY TYR GLY LYS LEU ILE PRO          
SEQRES   9 A  301  ILE GLY PRO LEU ALA ASN THR LEU VAL THR LEU GLU ALA          
SEQRES  10 A  301  LEU CYS GLY MET LEU GLY LEU ALA VAL ALA ALA SER LEU          
SEQRES  11 A  301  ILE TYR ALA ARG PHE THR ARG PRO THR ALA GLY VAL LEU          
SEQRES  12 A  301  PHE SER SER ARG MET VAL ILE SER ASP PHE GLU GLY LYS          
SEQRES  13 A  301  PRO THR LEU MET MET ARG LEU ALA ASN LEU ARG ILE GLU          
SEQRES  14 A  301  GLN ILE ILE GLU ALA ASP VAL HIS LEU VAL LEU VAL ARG          
SEQRES  15 A  301  SER GLU ILE SER GLN GLU GLY MET VAL PHE ARG ARG PHE          
SEQRES  16 A  301  HIS ASP LEU THR LEU THR ARG SER ARG SER PRO ILE PHE          
SEQRES  17 A  301  SER LEU SER TRP THR VAL MET HIS PRO ILE ASP HIS HIS          
SEQRES  18 A  301  SER PRO ILE TYR GLY GLU THR ASP GLU THR LEU ARG ASN          
SEQRES  19 A  301  SER HIS SER GLU PHE LEU VAL LEU PHE THR GLY HIS HIS          
SEQRES  20 A  301  GLU ALA PHE ALA GLN ASN VAL HIS ALA ARG HIS ALA TYR          
SEQRES  21 A  301  SER CYS ASP GLU ILE ILE TRP GLY GLY HIS PHE VAL ASP          
SEQRES  22 A  301  VAL PHE THR THR LEU PRO ASP GLY ARG ARG ALA LEU ASP          
SEQRES  23 A  301  LEU GLY LYS PHE HIS GLU ILE ALA GLN HIS HIS HIS HIS          
SEQRES  24 A  301  HIS HIS                                                      
SEQRES   1 B  301  MET THR GLY GLY MET LYS PRO PRO ALA ARG LYS PRO ARG          
SEQRES   2 B  301  ILE LEU ASN SER ASP GLY SER SER ASN ILE THR ARG LEU          
SEQRES   3 B  301  GLY LEU GLU LYS ARG GLY TRP LEU ASP ASP HIS TYR HIS          
SEQRES   4 B  301  ASP LEU LEU THR VAL SER TRP PRO VAL PHE ILE THR LEU          
SEQRES   5 B  301  ILE THR GLY LEU TYR LEU VAL THR ASN ALA LEU PHE ALA          
SEQRES   6 B  301  LEU ALA TYR LEU ALA CYS GLY ASP VAL ILE GLU ASN ALA          
SEQRES   7 B  301  ARG PRO GLY SER PHE THR ASP ALA PHE PHE PHE SER VAL          
SEQRES   8 B  301  GLN THR MET ALA THR ILE GLY TYR GLY LYS LEU ILE PRO          
SEQRES   9 B  301  ILE GLY PRO LEU ALA ASN THR LEU VAL THR LEU GLU ALA          
SEQRES  10 B  301  LEU CYS GLY MET LEU GLY LEU ALA VAL ALA ALA SER LEU          
SEQRES  11 B  301  ILE TYR ALA ARG PHE THR ARG PRO THR ALA GLY VAL LEU          
SEQRES  12 B  301  PHE SER SER ARG MET VAL ILE SER ASP PHE GLU GLY LYS          
SEQRES  13 B  301  PRO THR LEU MET MET ARG LEU ALA ASN LEU ARG ILE GLU          
SEQRES  14 B  301  GLN ILE ILE GLU ALA ASP VAL HIS LEU VAL LEU VAL ARG          
SEQRES  15 B  301  SER GLU ILE SER GLN GLU GLY MET VAL PHE ARG ARG PHE          
SEQRES  16 B  301  HIS ASP LEU THR LEU THR ARG SER ARG SER PRO ILE PHE          
SEQRES  17 B  301  SER LEU SER TRP THR VAL MET HIS PRO ILE ASP HIS HIS          
SEQRES  18 B  301  SER PRO ILE TYR GLY GLU THR ASP GLU THR LEU ARG ASN          
SEQRES  19 B  301  SER HIS SER GLU PHE LEU VAL LEU PHE THR GLY HIS HIS          
SEQRES  20 B  301  GLU ALA PHE ALA GLN ASN VAL HIS ALA ARG HIS ALA TYR          
SEQRES  21 B  301  SER CYS ASP GLU ILE ILE TRP GLY GLY HIS PHE VAL ASP          
SEQRES  22 B  301  VAL PHE THR THR LEU PRO ASP GLY ARG ARG ALA LEU ASP          
SEQRES  23 B  301  LEU GLY LYS PHE HIS GLU ILE ALA GLN HIS HIS HIS HIS          
SEQRES  24 B  301  HIS HIS                                                      
HET      K  A1000       1                                                       
HET      K  A1001       1                                                       
HET      K  A1002       1                                                       
HET      K  A1003       1                                                       
HET      K  A1004       1                                                       
HET     MG  A2001       1                                                       
HETNAM       K POTASSIUM ION                                                    
HETNAM      MG MAGNESIUM ION                                                    
FORMUL   3    K    5(K 1+)                                                      
FORMUL   8   MG    MG 2+                                                        
FORMUL   9  HOH   *180(H2 O)                                                    
HELIX    1   1 HIS A   39  VAL A   44  1                                   6    
HELIX    2   2 SER A   45  CYS A   71  1                                  27    
HELIX    3   3 SER A   82  ALA A   95  1                                  14    
HELIX    4   4 ILE A  105  THR A  136  1                                  32    
HELIX    5   5 THR A  228  HIS A  236  1                                   9    
HELIX    6   6 HIS B   37  VAL B   44  1                                   8    
HELIX    7   7 SER B   45  ALA B   70  1                                  26    
HELIX    8   8 SER B   82  ALA B   95  1                                  14    
HELIX    9   9 ILE B  105  THR B  136  1                                  32    
HELIX   10  10 THR B  228  SER B  235  1                                   8    
HELIX   11  11 LEU B  287  PHE B  290  5                                   4    
SHEET    1   A 3 THR A  24  ARG A  25  0                                        
SHEET    2   A 3 ARG B 283  LEU B 285  1  O  LEU B 285   N  THR A  24           
SHEET    3   A 3 PHE B 275  THR B 277 -1  N  THR B 276   O  ALA B 284           
SHEET    1   B 3 VAL A 142  PHE A 144  0                                        
SHEET    2   B 3 LYS A 156  ASN A 165 -1  O  ALA A 164   N  LEU A 143           
SHEET    3   B 3 SER A 211  PRO A 217 -1  O  HIS A 216   N  LEU A 159           
SHEET    1   C 4 VAL A 142  PHE A 144  0                                        
SHEET    2   C 4 LYS A 156  ASN A 165 -1  O  ALA A 164   N  LEU A 143           
SHEET    3   C 4 MET A 148  PHE A 153 -1  N  VAL A 149   O  MET A 160           
SHEET    4   C 4 ILE A 265  TRP A 267  1  O  ILE A 266   N  MET A 148           
SHEET    1   D 3 VAL A 191  ASP A 197  0                                        
SHEET    2   D 3 ILE A 171  ILE A 185 -1  N  LEU A 180   O  HIS A 196           
SHEET    3   D 3 ARG A 204  PHE A 208 -1  O  PHE A 208   N  ILE A 171           
SHEET    1   E 4 VAL A 191  ASP A 197  0                                        
SHEET    2   E 4 ILE A 171  ILE A 185 -1  N  LEU A 180   O  HIS A 196           
SHEET    3   E 4 GLU A 238  HIS A 247 -1  O  LEU A 240   N  VAL A 179           
SHEET    4   E 4 GLN A 252  SER A 261 -1  O  VAL A 254   N  GLY A 245           
SHEET    1   F 2 HIS A 270  PHE A 271  0                                        
SHEET    2   F 2 ILE A 293  ALA A 294 -1  O  ALA A 294   N  HIS A 270           
SHEET    1   G 2 PHE A 275  THR A 277  0                                        
SHEET    2   G 2 ARG A 283  LEU A 285 -1  O  ALA A 284   N  THR A 276           
SHEET    1   H 3 VAL B 142  PHE B 144  0                                        
SHEET    2   H 3 LYS B 156  ASN B 165 -1  O  ALA B 164   N  LEU B 143           
SHEET    3   H 3 SER B 211  PRO B 217 -1  O  HIS B 216   N  LEU B 159           
SHEET    1   I 4 VAL B 142  PHE B 144  0                                        
SHEET    2   I 4 LYS B 156  ASN B 165 -1  O  ALA B 164   N  LEU B 143           
SHEET    3   I 4 MET B 148  PHE B 153 -1  N  VAL B 149   O  MET B 160           
SHEET    4   I 4 ILE B 265  TRP B 267  1  O  ILE B 266   N  MET B 148           
SHEET    1   J 3 VAL B 191  ASP B 197  0                                        
SHEET    2   J 3 ILE B 171  ILE B 185 -1  N  ARG B 182   O  ARG B 194           
SHEET    3   J 3 ARG B 204  PHE B 208 -1  O  PHE B 208   N  ILE B 171           
SHEET    1   K 4 VAL B 191  ASP B 197  0                                        
SHEET    2   K 4 ILE B 171  ILE B 185 -1  N  ARG B 182   O  ARG B 194           
SHEET    3   K 4 GLU B 238  HIS B 247 -1  O  HIS B 246   N  ILE B 172           
SHEET    4   K 4 GLN B 252  SER B 261 -1  O  ALA B 256   N  PHE B 243           
SHEET    1   L 2 HIS B 270  PHE B 271  0                                        
SHEET    2   L 2 ILE B 293  ALA B 294 -1  O  ALA B 294   N  HIS B 270           
LINK         O   THR A  96                 K  B  K A1004     1555   1555  2.64  
LINK         OG1 THR A  96                 K  B  K A1004     1555   1555  2.52  
LINK         OG1 THR A  96                MG  A MG A2001     1555   1555  2.25  
LINK         O   ILE A  97                 K  A  K A1003     1555   1555  2.66  
LINK         O   GLY A  98                 K  B  K A1002     1555   1555  2.95  
LINK         O   TYR A  99                 K  B  K A1002     1555   1555  2.42  
LINK         O   THR B  96                 K  B  K A1004     1555   1555  2.59  
LINK         OG1 THR B  96                 K  B  K A1004     1555   1555  2.67  
LINK         OG1 THR B  96                MG  A MG A2001     1555   1555  2.36  
LINK         O   ILE B  97                 K  A  K A1003     1555   1555  2.68  
LINK         O   TYR B  99                 K  B  K A1002     1555   1555  2.49  
LINK         K  B  K A1002                 O  BHOH A2003     1555   1555  2.81  
LINK         K  A  K A1003                 O  AHOH A2002     1555   1555  2.97  
LINK        MG  A MG A2001                 O  AHOH B2002     1555   1555  2.08  
SITE     1 AC1  5 GLY A  98  TYR A  99  HOH A2003  GLY B  98                    
SITE     2 AC1  5 TYR B  99                                                     
SITE     1 AC2  5 ILE A  97  GLY A  98  HOH A2002  ILE B  97                    
SITE     2 AC2  5 GLY B  98                                                     
SITE     1 AC3  2 THR A  96  THR B  96                                          
SITE     1 AC4  3 THR A  96  THR B  96  HOH B2002                               
CRYST1  105.627  109.385   88.786  90.00  90.00  90.00 P 21 21 2     8          
ORIGX1      1.000000  0.000000  0.000000        0.00000                         
ORIGX2      0.000000  1.000000  0.000000        0.00000                         
ORIGX3      0.000000  0.000000  1.000000        0.00000                         
SCALE1      0.009467  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.009142  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.011263        0.00000