PDB Short entry for 1I6P
HEADER    LYASE                                   02-MAR-01   1I6P              
TITLE     CRYSTAL STRUCTURE OF E. COLI BETA CARBONIC ANHYDRASE (ECCA)           
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: CARBONIC ANHYDRASE;                                        
COMPND   3 CHAIN: A;                                                            
COMPND   4 EC: 4.2.1.1;                                                         
COMPND   5 ENGINEERED: YES                                                      
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: ESCHERICHIA COLI;                               
SOURCE   3 ORGANISM_TAXID: 562;                                                 
SOURCE   4 GENE: YADF;                                                          
SOURCE   5 EXPRESSION_SYSTEM: ESCHERICHIA COLI BL21;                            
SOURCE   6 EXPRESSION_SYSTEM_TAXID: 511693;                                     
SOURCE   7 EXPRESSION_SYSTEM_STRAIN: BL21;                                      
SOURCE   8 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID;                              
SOURCE   9 EXPRESSION_SYSTEM_PLASMID: PET3A                                     
KEYWDS    CARBONIC ANHYDRASE, METALLOENZYME, ZINC COORDINATION, PH-DEPENDENT    
KEYWDS   2 ACTIVITY, MAD PHASING, LYASE                                         
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    J.D.CRONK,J.A.ENDRIZZI,M.R.CRONK,J.W.O'NEILL,K.Y.J.ZHANG              
REVDAT   4   13-JUL-11 1I6P    1       VERSN                                    
REVDAT   3   24-FEB-09 1I6P    1       VERSN                                    
REVDAT   2   01-APR-03 1I6P    1       JRNL                                     
REVDAT   1   09-MAY-01 1I6P    0                                                
JRNL        AUTH   J.D.CRONK,J.A.ENDRIZZI,M.R.CRONK,J.W.O'NEILL,K.Y.ZHANG       
JRNL        TITL   CRYSTAL STRUCTURE OF E. COLI BETA-CARBONIC ANHYDRASE, AN     
JRNL        TITL 2 ENZYME WITH AN UNUSUAL PH-DEPENDENT ACTIVITY.                
JRNL        REF    PROTEIN SCI.                  V.  10   911 2001              
JRNL        REFN                   ISSN 0961-8368                               
JRNL        PMID   11316870                                                     
JRNL        DOI    10.1110/PS.46301                                             
REMARK   1                                                                      
REMARK   1 REFERENCE 1                                                          
REMARK   1  AUTH   J.D.CRONK,J.W.O'NEILL,M.R.CRONK,J.A.ENDRIZZI,K.Y.J.ZHANG     
REMARK   1  TITL   CLONING, CRYSTALLIZATION AND PRELIMINARY CHARACTERIZATION OF 
REMARK   1  TITL 2 A BETA CARBONIC ANHYDRASE FROM ESCHERICHIA COLI              
REMARK   1  REF    ACTA CRYSTALLOGR.,SECT.D      V.  52  1176 2000              
REMARK   1  REFN                   ISSN 0907-4449                               
REMARK   1  DOI    10.1107/S0907444900008519                                    
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.00 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : CNS 1.0                                              
REMARK   3   AUTHORS     : BRUNGER,ADAMS,CLORE,DELANO,GROS,GROSSE-              
REMARK   3               : KUNSTLEVE,JIANG,KUSZEWSKI,NILGES,PANNU,              
REMARK   3               : READ,RICE,SIMONSON,WARREN                            
REMARK   3                                                                      
REMARK   3  REFINEMENT TARGET : ENGH & HUBER                                    
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.00                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 42.21                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 0.000                          
REMARK   3   DATA CUTOFF HIGH         (ABS(F)) : 334555.690                     
REMARK   3   DATA CUTOFF LOW          (ABS(F)) : 0.0000                         
REMARK   3   COMPLETENESS (WORKING+TEST)   (%) : 94.7                           
REMARK   3   NUMBER OF REFLECTIONS             : 13653                          
REMARK   3                                                                      
REMARK   3  FIT TO DATA USED IN REFINEMENT.                                     
REMARK   3   CROSS-VALIDATION METHOD          : THROUGHOUT                      
REMARK   3   FREE R VALUE TEST SET SELECTION  : RANDOM                          
REMARK   3   R VALUE            (WORKING SET) : 0.176                           
REMARK   3   FREE R VALUE                     : 0.202                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 10.100                          
REMARK   3   FREE R VALUE TEST SET COUNT      : 1379                            
REMARK   3   ESTIMATED ERROR OF FREE R VALUE  : 0.005                           
REMARK   3                                                                      
REMARK   3  FIT IN THE HIGHEST RESOLUTION BIN.                                  
REMARK   3   TOTAL NUMBER OF BINS USED           : 6                            
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : 2.00                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 2.13                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : 92.60                        
REMARK   3   REFLECTIONS IN BIN    (WORKING SET) : 1955                         
REMARK   3   BIN R VALUE           (WORKING SET) : 0.1910                       
REMARK   3   BIN FREE R VALUE                    : 0.2150                       
REMARK   3   BIN FREE R VALUE TEST SET SIZE  (%) : 10.20                        
REMARK   3   BIN FREE R VALUE TEST SET COUNT     : 223                          
REMARK   3   ESTIMATED ERROR OF BIN FREE R VALUE : 0.014                        
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 1715                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 1                                       
REMARK   3   SOLVENT ATOMS            : 62                                      
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : 15.60                          
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : 28.80                          
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : -0.34000                                             
REMARK   3    B22 (A**2) : -0.34000                                             
REMARK   3    B33 (A**2) : 0.69000                                              
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) : 0.19                            
REMARK   3   ESD FROM SIGMAA              (A) : 0.11                            
REMARK   3   LOW RESOLUTION CUTOFF        (A) : 5.00                            
REMARK   3                                                                      
REMARK   3  CROSS-VALIDATED ESTIMATED COORDINATE ERROR.                         
REMARK   3   ESD FROM C-V LUZZATI PLOT    (A) : 0.24                            
REMARK   3   ESD FROM C-V SIGMAA          (A) : 0.15                            
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.                                   
REMARK   3   BOND LENGTHS                 (A) : 0.004                           
REMARK   3   BOND ANGLES            (DEGREES) : 1.10                            
REMARK   3   DIHEDRAL ANGLES        (DEGREES) : 20.40                           
REMARK   3   IMPROPER ANGLES        (DEGREES) : 0.62                            
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL MODEL : RESTRAINED                                
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.    RMS    SIGMA                
REMARK   3   MAIN-CHAIN BOND              (A**2) : NULL  ; NULL                 
REMARK   3   MAIN-CHAIN ANGLE             (A**2) : NULL  ; NULL                 
REMARK   3   SIDE-CHAIN BOND              (A**2) : NULL  ; NULL                 
REMARK   3   SIDE-CHAIN ANGLE             (A**2) : NULL  ; NULL                 
REMARK   3                                                                      
REMARK   3  BULK SOLVENT MODELING.                                              
REMARK   3   METHOD USED : FLAT MODEL                                           
REMARK   3   KSOL        : 0.34                                                 
REMARK   3   BSOL        : 44.43                                                
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  : PROTEIN_REP.PARAM                              
REMARK   3  PARAMETER FILE  2  : WATER_REP.PARAM                                
REMARK   3  PARAMETER FILE  3  : ION.PARAM                                      
REMARK   3  PARAMETER FILE  4  : NULL                                           
REMARK   3  TOPOLOGY FILE  1   : PROTEIN.TOP                                    
REMARK   3  TOPOLOGY FILE  2   : NULL                                           
REMARK   3  TOPOLOGY FILE  3   : NULL                                           
REMARK   3  TOPOLOGY FILE  4   : NULL                                           
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: NULL                                      
REMARK   4                                                                      
REMARK   4 1I6P COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK  99                                                                      
REMARK  99 DENSITY FOR THE FOLLOWING ATOMS WITHIN THE MAIN CHAIN                
REMARK  99 IS RELATIVELY WEAK AND LIKELY REFLECTS INCREASED LOCAL               
REMARK  99 CONFORMATIONAL FLEXIBILITY OF THE MAIN CHAIN IN THIS                 
REMARK  99 REGION.                                                              
REMARK  99 GLN A 31 CA                                                          
REMARK  99 ALA A 32 N                                                           
REMARK  99 ALA A 32 CA                                                          
REMARK  99                                                                      
REMARK  99 DENSITY FOR THE SIDE CHAINS OF THE LISTED RESIDUES IS                
REMARK  99 RELATIVELY POORLY DEFINED.  THE MODEL REPRESENTS THE                 
REMARK  99 MOST PROBABLE CONFORMATIONS FOR THESE RESIDUES BASED                 
REMARK  99 ON THE OBSERVED DENSITY.                                             
REMARK  99 GLU A    20                                                          
REMARK  99 GLU A    21                                                          
REMARK  99 LYS A    28                                                          
REMARK  99 LEU A    29                                                          
REMARK  99 GLN A    31                                                          
REMARK  99 ALA A    32                                                          
REMARK  99 GLN A    33                                                          
REMARK  99 LYS A    34                                                          
REMARK  99 GLU A   112                                                          
REMARK  99 GLU A   140                                                          
REMARK  99 ARG A   141                                                          
REMARK  99 LYS A   169                                                          
REMARK  99 LYS A   173                                                          
REMARK  99 ARG A   189                                                          
REMARK  99 ARG A   198                                                          
REMARK  99 GLU A   199                                                          
REMARK  99 LYS A   213                                                          
REMARK  99 LEU A   214                                                          
REMARK  99 LYS A   215                                                          
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 07-MAR-01.                  
REMARK 100 THE RCSB ID CODE IS RCSB012972.                                      
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 08-APR-99                          
REMARK 200  TEMPERATURE           (KELVIN) : 291                                
REMARK 200  PH                             : 6.3                                
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : N                                  
REMARK 200  RADIATION SOURCE               : ROTATING ANODE                     
REMARK 200  BEAMLINE                       : NULL                               
REMARK 200  X-RAY GENERATOR MODEL          : RIGAKU RU200                       
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 1.5418                             
REMARK 200  MONOCHROMATOR                  : MIRRORS                            
REMARK 200  OPTICS                         : MIRRORS                            
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : IMAGE PLATE                        
REMARK 200  DETECTOR MANUFACTURER          : RIGAKU RAXIS IV                    
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : DENZO                              
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 13974                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.000                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 40.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : 0.000                              
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 96.7                               
REMARK 200  DATA REDUNDANCY                : 6.500                              
REMARK 200  R MERGE                    (I) : 0.06500                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 20.4000                            
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 2.00                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 2.03                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 96.9                               
REMARK 200  DATA REDUNDANCY IN SHELL       : 3.50                               
REMARK 200  R MERGE FOR SHELL          (I) : 0.30900                            
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : 4.400                              
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH                              
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: EPMR                                                  
REMARK 200 STARTING MODEL: PDB ENTRY 1I6O                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 36.40                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.01                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: AMMONIUM SULFATE, MES PH 6.3, VAPOR      
REMARK 280  DIFFUSION, HANGING DROP, TEMPERATURE 293K                           
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 42 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   -Y+1/2,X+1/2,Z+1/2                                      
REMARK 290       4555   Y+1/2,-X+1/2,Z+1/2                                      
REMARK 290       5555   -X+1/2,Y+1/2,-Z+1/2                                     
REMARK 290       6555   X+1/2,-Y+1/2,-Z+1/2                                     
REMARK 290       7555   Y,X,-Z                                                  
REMARK 290       8555   -Y,-X,-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  0.000000 -1.000000  0.000000       34.26750            
REMARK 290   SMTRY2   3  1.000000  0.000000  0.000000       34.26750            
REMARK 290   SMTRY3   3  0.000000  0.000000  1.000000       42.93850            
REMARK 290   SMTRY1   4  0.000000  1.000000  0.000000       34.26750            
REMARK 290   SMTRY2   4 -1.000000  0.000000  0.000000       34.26750            
REMARK 290   SMTRY3   4  0.000000  0.000000  1.000000       42.93850            
REMARK 290   SMTRY1   5 -1.000000  0.000000  0.000000       34.26750            
REMARK 290   SMTRY2   5  0.000000  1.000000  0.000000       34.26750            
REMARK 290   SMTRY3   5  0.000000  0.000000 -1.000000       42.93850            
REMARK 290   SMTRY1   6  1.000000  0.000000  0.000000       34.26750            
REMARK 290   SMTRY2   6  0.000000 -1.000000  0.000000       34.26750            
REMARK 290   SMTRY3   6  0.000000  0.000000 -1.000000       42.93850            
REMARK 290   SMTRY1   7  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   7  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   7  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   8  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   8 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   8  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 300 REMARK: A TETRAMER CONSTRUCTED FROM THE OPERATIONS -Y, -X, -Z; Y,    
REMARK 300 X, -Z; -1-X, 1-Y, Z IS THOUGHT TO EXIST IN SOLUTION UNDER            
REMARK 300 PHYSIOLOGICAL CONDITIONS.                                            
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: 15570 ANGSTROM**2                         
REMARK 350 SURFACE AREA OF THE COMPLEX: 33060 ANGSTROM**2                       
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -83.0 KCAL/MOL                        
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A                                     
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        0.00000            
REMARK 350   BIOMT2   2  0.000000 -1.000000  0.000000      137.07000            
REMARK 350   BIOMT3   2  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT1   3  0.000000  1.000000  0.000000      -68.53500            
REMARK 350   BIOMT2   3  1.000000  0.000000  0.000000       68.53500            
REMARK 350   BIOMT3   3  0.000000  0.000000 -1.000000       85.87700            
REMARK 350   BIOMT1   4  0.000000 -1.000000  0.000000       68.53500            
REMARK 350   BIOMT2   4 -1.000000  0.000000  0.000000       68.53500            
REMARK 350   BIOMT3   4  0.000000  0.000000 -1.000000       85.87700            
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     HIS A   216                                                      
REMARK 465     ALA A   217                                                      
REMARK 465     ASN A   218                                                      
REMARK 465     HIS A   219                                                      
REMARK 465     LYS A   220                                                      
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    GLU A  21      -31.31   -151.41                                   
REMARK 500    ASP A  22       67.28   -168.13                                   
REMARK 500    ALA A  32       87.51    -52.75                                   
REMARK 500    SER A  45       53.28     39.78                                   
REMARK 500    ASP A 185       -2.91   -150.25                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
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                              ZN A 301  ZN                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 CYS A 101   SG                                                     
REMARK 620 2 ASP A  44   OD2 112.2                                              
REMARK 620 3 HIS A  98   NE2 108.1 100.3                                        
REMARK 620 4 CYS A  42   SG  113.3  99.8 121.9                                  
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 ZN A 301                  
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 1I6O   RELATED DB: PDB                                   
REMARK 900 CRYSTAL STRUCTURE OF E. COLI BETA CARBONIC ANHYDRASE (ECCA)          
REMARK 900 IN A DIFFERENT SPACE GROUP, P4322, SOLVED TO 2.2A RESOLUTION         
DBREF  1I6P A    1   220  UNP    P61517   CAN_ECOLI        1    220             
SEQRES   1 A  220  MET LYS ASP ILE ASP THR LEU ILE SER ASN ASN ALA LEU          
SEQRES   2 A  220  TRP SER LYS MET LEU VAL GLU GLU ASP PRO GLY PHE PHE          
SEQRES   3 A  220  GLU LYS LEU ALA GLN ALA GLN LYS PRO ARG PHE LEU TRP          
SEQRES   4 A  220  ILE GLY CYS SER ASP SER ARG VAL PRO ALA GLU ARG LEU          
SEQRES   5 A  220  THR GLY LEU GLU PRO GLY GLU LEU PHE VAL HIS ARG ASN          
SEQRES   6 A  220  VAL ALA ASN LEU VAL ILE HIS THR ASP LEU ASN CYS LEU          
SEQRES   7 A  220  SER VAL VAL GLN TYR ALA VAL ASP VAL LEU GLU VAL GLU          
SEQRES   8 A  220  HIS ILE ILE ILE CYS GLY HIS TYR GLY CYS GLY GLY VAL          
SEQRES   9 A  220  GLN ALA ALA VAL GLU ASN PRO GLU LEU GLY LEU ILE ASN          
SEQRES  10 A  220  ASN TRP LEU LEU HIS ILE ARG ASP ILE TRP PHE LYS HIS          
SEQRES  11 A  220  SER SER LEU LEU GLY GLU MET PRO GLN GLU ARG ARG LEU          
SEQRES  12 A  220  ASP THR LEU CYS GLU LEU ASN VAL MET GLU GLN VAL TYR          
SEQRES  13 A  220  ASN LEU GLY HIS SER THR ILE MET GLN SER ALA TRP LYS          
SEQRES  14 A  220  ARG GLY GLN LYS VAL THR ILE HIS GLY TRP ALA TYR GLY          
SEQRES  15 A  220  ILE HIS ASP GLY LEU LEU ARG ASP LEU ASP VAL THR ALA          
SEQRES  16 A  220  THR ASN ARG GLU THR LEU GLU GLN ARG TYR ARG HIS GLY          
SEQRES  17 A  220  ILE SER ASN LEU LYS LEU LYS HIS ALA ASN HIS LYS              
HET     ZN  A 301       1                                                       
HETNAM      ZN ZINC ION                                                         
FORMUL   2   ZN    ZN 2+                                                        
FORMUL   3  HOH   *62(H2 O)                                                     
HELIX    1   1 ASP A    3  GLU A   20  1                                  18    
HELIX    2   2 PHE A   26  GLN A   31  1                                   6    
HELIX    3   3 PRO A   48  GLY A   54  1                                   7    
HELIX    4   4 ASP A   74  VAL A   87  1                                  14    
HELIX    5   5 CYS A  101  ASN A  110  1                                  10    
HELIX    6   6 LEU A  115  HIS A  130  1                                  16    
HELIX    7   7 HIS A  130  GLY A  135  1                                   6    
HELIX    8   8 GLU A  136  MET A  137  5                                   2    
HELIX    9   9 PRO A  138  GLU A  140  5                                   3    
HELIX   10  10 ARG A  141  SER A  161  1                                  21    
HELIX   11  11 SER A  161  ARG A  170  1                                  10    
HELIX   12  12 ASN A  197  LYS A  215  1                                  19    
SHEET    1   A 5 LEU A  60  ASN A  65  0                                        
SHEET    2   A 5 PHE A  37  CYS A  42  1  O  PHE A  37   N  PHE A  61           
SHEET    3   A 5 HIS A  92  HIS A  98  1  O  HIS A  92   N  LEU A  38           
SHEET    4   A 5 THR A 175  TYR A 181  1  O  THR A 175   N  ILE A  93           
SHEET    5   A 5 LEU A 188  ASP A 190 -1  N  ARG A 189   O  ALA A 180           
LINK        ZN    ZN A 301                 SG  CYS A 101     1555   1555  2.37  
LINK        ZN    ZN A 301                 OD2 ASP A  44     1555   1555  2.10  
LINK        ZN    ZN A 301                 NE2 HIS A  98     1555   1555  2.21  
LINK        ZN    ZN A 301                 SG  CYS A  42     1555   1555  2.34  
SITE     1 AC1  4 CYS A  42  ASP A  44  HIS A  98  CYS A 101                    
CRYST1   68.535   68.535   85.877  90.00  90.00  90.00 P 42 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      0.014591  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.014591  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.011645        0.00000