PDB Short entry for 2PUA
HEADER    TRANSCRIPTION/DNA                       04-OCT-97   2PUA              
TITLE     CRYSTAL STRUCTURE OF THE LACI FAMILY MEMBER, PURR, BOUND TO DNA: MINOR
TITLE    2 GROOVE BINDING BY ALPHA HELICES                                      
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: DNA (5'-                                                   
COMPND   3 D(*TP*AP*CP*GP*CP*AP*AP*AP*CP*GP*TP*TP*TP*GP*CP*GP*T )-3');          
COMPND   4 CHAIN: B;                                                            
COMPND   5 ENGINEERED: YES;                                                     
COMPND   6 MOL_ID: 2;                                                           
COMPND   7 MOLECULE: PURINE REPRESSOR;                                          
COMPND   8 CHAIN: A;                                                            
COMPND   9 ENGINEERED: YES;                                                     
COMPND  10 MUTATION: YES                                                        
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 MOL_ID: 2;                                                           
SOURCE   3 ORGANISM_SCIENTIFIC: ESCHERICHIA COLI;                               
SOURCE   4 ORGANISM_TAXID: 562;                                                 
SOURCE   5 GENE: PURR;                                                          
SOURCE   6 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   7 EXPRESSION_SYSTEM_TAXID: 511693;                                     
SOURCE   8 EXPRESSION_SYSTEM_STRAIN: BL21;                                      
SOURCE   9 EXPRESSION_SYSTEM_VECTOR: PET24A                                     
KEYWDS    COMPLEX (DNA-BINDING PROTEIN-DNA), DNA-BINDING REGULATORY PROTEIN,    
KEYWDS   2 TRANSCRIPTION-DNA COMPLEX                                            
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    R.G.SCHUMACHER,K.Y.CHOI,H.ZALKIN,M.A.BRENNAN                          
REVDAT   5   03-NOV-21 2PUA    1       REMARK SEQADV                            
REVDAT   4   04-APR-18 2PUA    1       REMARK                                   
REVDAT   3   08-MAR-17 2PUA    1       AUTHOR SOURCE VERSN                      
REVDAT   2   24-FEB-09 2PUA    1       VERSN                                    
REVDAT   1   06-MAY-98 2PUA    0                                                
JRNL        AUTH   M.A.SCHUMACHER,K.Y.CHOI,H.ZALKIN,R.G.BRENNAN                 
JRNL        TITL   CRYSTAL STRUCTURE OF LACI MEMBER, PURR, BOUND TO DNA: MINOR  
JRNL        TITL 2 GROOVE BINDING BY ALPHA HELICES.                             
JRNL        REF    SCIENCE                       V. 266   763 1994              
JRNL        REFN                   ISSN 0036-8075                               
JRNL        PMID   7973627                                                      
REMARK   1                                                                      
REMARK   1 REFERENCE 1                                                          
REMARK   1  AUTH   F.LU,M.A.SCHUMACHER,D.N.ARVIDSON,A.HALDIMANN,B.L.WANNER,     
REMARK   1  AUTH 2 H.ZALKIN,R.G.BRENNAN                                         
REMARK   1  TITL   STRUCTURE-BASED REDESIGN OF COREPRESSOR SPECIFICITY OF THE   
REMARK   1  TITL 2 ESCHERICHIA COLI PURINE REPRESSOR BY SUBSTITUTION OF RESIDUE 
REMARK   1  TITL 3 190                                                          
REMARK   1  REF    BIOCHEMISTRY                  V.  37   971 1998              
REMARK   1  REFN                   ISSN 0006-2960                               
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.90 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : TNT                                                  
REMARK   3   AUTHORS     : TRONRUD,TEN EYCK,MATTHEWS                            
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.90                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 10.00                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 1.000                          
REMARK   3   COMPLETENESS FOR RANGE        (%) : 99.0                           
REMARK   3   NUMBER OF REFLECTIONS             : 14911                          
REMARK   3                                                                      
REMARK   3  USING DATA ABOVE SIGMA CUTOFF.                                      
REMARK   3   CROSS-VALIDATION METHOD          : NULL                            
REMARK   3   FREE R VALUE TEST SET SELECTION  : NULL                            
REMARK   3   R VALUE     (WORKING + TEST SET) : NULL                            
REMARK   3   R VALUE            (WORKING SET) : 0.166                           
REMARK   3   FREE R VALUE                     : NULL                            
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : NULL                            
REMARK   3   FREE R VALUE TEST SET COUNT      : NULL                            
REMARK   3                                                                      
REMARK   3  USING ALL DATA, NO SIGMA CUTOFF.                                    
REMARK   3   R VALUE   (WORKING + TEST SET, NO CUTOFF) : NULL                   
REMARK   3   R VALUE          (WORKING SET, NO CUTOFF) : NULL                   
REMARK   3   FREE R VALUE                  (NO CUTOFF) : NULL                   
REMARK   3   FREE R VALUE TEST SET SIZE (%, NO CUTOFF) : NULL                   
REMARK   3   FREE R VALUE TEST SET COUNT   (NO CUTOFF) : NULL                   
REMARK   3   TOTAL NUMBER OF REFLECTIONS   (NO CUTOFF) : NULL                   
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 2651                                    
REMARK   3   NUCLEIC ACID ATOMS       : 345                                     
REMARK   3   HETEROGEN ATOMS          : 10                                      
REMARK   3   SOLVENT ATOMS            : 59                                      
REMARK   3                                                                      
REMARK   3  WILSON B VALUE (FROM FCALC, A**2) : NULL                            
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.    RMS    WEIGHT  COUNT           
REMARK   3   BOND LENGTHS                 (A) : 0.016 ; 1.900 ; 3097            
REMARK   3   BOND ANGLES            (DEGREES) : 1.756 ; 2.200 ; 4243            
REMARK   3   TORSION ANGLES         (DEGREES) : 20.510; 0.000 ; 1754            
REMARK   3   PSEUDOROTATION ANGLES  (DEGREES) : 63.310; 1.000 ; 15              
REMARK   3   TRIGONAL CARBON PLANES       (A) : 0.012 ; 3.400 ; 67              
REMARK   3   GENERAL PLANES               (A) : 0.010 ; 4.000 ; 409             
REMARK   3   ISOTROPIC THERMAL FACTORS (A**2) : 5.098 ; 4.900 ; 2705            
REMARK   3   NON-BONDED CONTACTS          (A) : 0.060 ; 19.000; 0               
REMARK   3                                                                      
REMARK   3  INCORRECT CHIRAL-CENTERS (COUNT) : NULL                             
REMARK   3                                                                      
REMARK   3  BULK SOLVENT MODELING.                                              
REMARK   3   METHOD USED : NULL                                                 
REMARK   3   KSOL        : NULL                                                 
REMARK   3   BSOL        : NULL                                                 
REMARK   3                                                                      
REMARK   3  RESTRAINT LIBRARIES.                                                
REMARK   3   STEREOCHEMISTRY : NULL                                             
REMARK   3   ISOTROPIC THERMAL FACTOR RESTRAINTS : ISOTROPIC                    
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: NULL                                      
REMARK   4                                                                      
REMARK   4 2PUA COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY NDB.                                
REMARK 100 THE DEPOSITION ID IS D_1000178518.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : NULL                               
REMARK 200  TEMPERATURE           (KELVIN) : 293.00                             
REMARK 200  PH                             : 7.40                               
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) : NULL                               
REMARK 200  WAVELENGTH OR RANGE        (A) : 1.5418                             
REMARK 200  MONOCHROMATOR                  : NULL                               
REMARK 200  OPTICS                         : NULL                               
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : AREA DETECTOR                      
REMARK 200  DETECTOR MANUFACTURER          : SDMS                               
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : SDMS                               
REMARK 200  DATA SCALING SOFTWARE          : SDMS                               
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 14911                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.900                              
REMARK 200  RESOLUTION RANGE LOW       (A) : NULL                               
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : NULL                               
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 99.0                               
REMARK 200  DATA REDUNDANCY                : 3.430                              
REMARK 200  R MERGE                    (I) : 0.09000                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 5.7000                             
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: NULL                                           
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: NULL                         
REMARK 200 SOFTWARE USED: NULL                                                  
REMARK 200 STARTING MODEL: NULL                                                 
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 68.76                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 3.94                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: PH 7.40, VAPOR DIFFUSION, HANGING        
REMARK 280  DROP, TEMPERATURE 293.00K                                           
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: C 2 2 21                         
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X,-Y,Z+1/2                                             
REMARK 290       3555   -X,Y,-Z+1/2                                             
REMARK 290       4555   X,-Y,-Z                                                 
REMARK 290       5555   X+1/2,Y+1/2,Z                                           
REMARK 290       6555   -X+1/2,-Y+1/2,Z+1/2                                     
REMARK 290       7555   -X+1/2,Y+1/2,-Z+1/2                                     
REMARK 290       8555   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       40.91500            
REMARK 290   SMTRY1   3 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   3  0.000000  0.000000 -1.000000       40.91500            
REMARK 290   SMTRY1   4  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   4  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   4  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   5  1.000000  0.000000  0.000000       87.82500            
REMARK 290   SMTRY2   5  0.000000  1.000000  0.000000       47.34000            
REMARK 290   SMTRY3   5  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   6 -1.000000  0.000000  0.000000       87.82500            
REMARK 290   SMTRY2   6  0.000000 -1.000000  0.000000       47.34000            
REMARK 290   SMTRY3   6  0.000000  0.000000  1.000000       40.91500            
REMARK 290   SMTRY1   7 -1.000000  0.000000  0.000000       87.82500            
REMARK 290   SMTRY2   7  0.000000  1.000000  0.000000       47.34000            
REMARK 290   SMTRY3   7  0.000000  0.000000 -1.000000       40.91500            
REMARK 290   SMTRY1   8  1.000000  0.000000  0.000000       87.82500            
REMARK 290   SMTRY2   8  0.000000 -1.000000  0.000000       47.34000            
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: THE COMPLEX LIES ON A CRYSTALLOGRAPHIC TWO-FOLD AXIS, AND    
REMARK 300 ONLY ONE MONOMER-DNA HALF-SITE CONSTITUTES THE ASYMMETRIC            
REMARK 300 UNIT.  THE COORDINATES COMPRISE ONE REPRESSOR MONOMER AND            
REMARK 300 ONE DNA STRAND FOR THE ENTIRE SITE.  THE FULL COMPLEX CAN            
REMARK 300 BE CONSTRUCTED BY GENERATING THE SECOND HALF USING THE               
REMARK 300 CRYSTALLOGRAPHIC SYMMETRY OPERATION (X, -Y, -Z).                     
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 APPLY THE FOLLOWING TO CHAINS: B, 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        0.00000            
REMARK 350   BIOMT3   2  0.000000  0.000000 -1.000000        0.00000            
REMARK 400                                                                      
REMARK 400 COMPOUND                                                             
REMARK 400 THE HYDROGEN BONDS FROM ARG 190 TO THE O6 EXOCYCLIC ATOM             
REMARK 400 IS WHAT DETERMINES PURR'S SPECIFICITY FOR COREPRESSORS               
REMARK 400 HYPOXANTHINE AND GUANINE AND ALLOWS IT TO DISCRIMINATE               
REMARK 400 AGAINST ADENINE.  MUTATING ARG 190 TO ALA RESULTS IN A               
REMARK 400 PURR PROTEIN WHICH CAN BIND ADENINE IN ADDITION TO                   
REMARK 400 HYPOXANTHINE AND GUANINE.                                            
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     ARG A   341                                                      
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: COVALENT BOND LENGTHS                                      
REMARK 500                                                                      
REMARK 500 THE STEREOCHEMICAL PARAMETERS OF THE FOLLOWING RESIDUES              
REMARK 500 HAVE VALUES WHICH DEVIATE FROM EXPECTED VALUES BY MORE               
REMARK 500 THAN 6*RMSD (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN               
REMARK 500 IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE).                 
REMARK 500                                                                      
REMARK 500 STANDARD TABLE:                                                      
REMARK 500 FORMAT: (10X,I3,1X,2(A3,1X,A1,I4,A1,1X,A4,3X),1X,F6.3)               
REMARK 500                                                                      
REMARK 500 EXPECTED VALUES PROTEIN: ENGH AND HUBER, 1999                        
REMARK 500 EXPECTED VALUES NUCLEIC ACID: CLOWNEY ET AL 1996                     
REMARK 500                                                                      
REMARK 500  M RES CSSEQI ATM1   RES CSSEQI ATM2   DEVIATION                     
REMARK 500     DG B 702   N7     DG B 702   C8      0.050                       
REMARK 500     DG B 708   N7     DG B 708   C8      0.048                       
REMARK 500     DG B 712   N7     DG B 712   C8      0.048                       
REMARK 500     DG B 714   N7     DG B 714   C8      0.054                       
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: COVALENT BOND ANGLES                                       
REMARK 500                                                                      
REMARK 500 THE STEREOCHEMICAL PARAMETERS OF THE FOLLOWING RESIDUES              
REMARK 500 HAVE VALUES WHICH DEVIATE FROM EXPECTED VALUES BY MORE               
REMARK 500 THAN 6*RMSD (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN               
REMARK 500 IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE).                 
REMARK 500                                                                      
REMARK 500 STANDARD TABLE:                                                      
REMARK 500 FORMAT: (10X,I3,1X,A3,1X,A1,I4,A1,3(1X,A4,2X),12X,F5.1)              
REMARK 500                                                                      
REMARK 500 EXPECTED VALUES PROTEIN: ENGH AND HUBER, 1999                        
REMARK 500 EXPECTED VALUES NUCLEIC ACID: CLOWNEY ET AL 1996                     
REMARK 500                                                                      
REMARK 500  M RES CSSEQI ATM1   ATM2   ATM3                                     
REMARK 500     DC B 713   O4' -  C1' -  N1  ANGL. DEV. =   2.2 DEGREES          
REMARK 500     DT B 715   O4' -  C1' -  N1  ANGL. DEV. =   2.0 DEGREES          
REMARK 500    LEU A 173   CA  -  CB  -  CG  ANGL. DEV. = -14.7 DEGREES          
REMARK 500    PRO A 223   C   -  N   -  CD  ANGL. DEV. = -13.8 DEGREES          
REMARK 500    PRO A 237   C   -  N   -  CD  ANGL. DEV. = -18.5 DEGREES          
REMARK 500    ASP A 248   CB  -  CG  -  OD2 ANGL. DEV. =   6.0 DEGREES          
REMARK 500    CYS A 256   CB  -  CA  -  C   ANGL. DEV. =   7.6 DEGREES          
REMARK 500    CYS A 256   CA  -  CB  -  SG  ANGL. DEV. =   7.5 DEGREES          
REMARK 500    LEU A 263   CA  -  CB  -  CG  ANGL. DEV. = -20.4 DEGREES          
REMARK 500    LEU A 263   CB  -  CG  -  CD1 ANGL. DEV. = -10.6 DEGREES          
REMARK 500    VAL A 269   CB  -  CA  -  C   ANGL. DEV. = -13.6 DEGREES          
REMARK 500    LEU A 287   CA  -  CB  -  CG  ANGL. DEV. = -15.1 DEGREES          
REMARK 500    LEU A 305   CB  -  CG  -  CD2 ANGL. DEV. = -10.3 DEGREES          
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
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    HIS A  58      143.38   -177.58                                   
REMARK 500    TYR A  73      -72.39    -51.00                                   
REMARK 500    TRP A  98       15.74     56.10                                   
REMARK 500    SER A 124      -80.89     63.40                                   
REMARK 500    GLU A 136      -18.95    -42.37                                   
REMARK 500    PHE A 154       33.02    -94.24                                   
REMARK 500    ARG A 179      -17.41   -145.80                                   
REMARK 500    PHE A 221       -1.24     79.66                                   
REMARK 500    TYR A 227      -70.13    -32.30                                   
REMARK 500    SER A 235       33.51    -90.46                                   
REMARK 500    PRO A 237      -64.93    -28.38                                   
REMARK 500    ASP A 275      -42.27    130.38                                   
REMARK 500    ASN A 276       64.70     62.94                                   
REMARK 500    ASP A 307      -70.36    -52.08                                   
REMARK 500    ILE A 309      -75.50    -53.46                                   
REMARK 500    LYS A 312       40.80     32.58                                   
REMARK 500    ARG A 328     -132.88   -116.13                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE 6MP A 599                 
DBREF  2PUA A    2   341  UNP    P0ACP7   PURR_ECOLI       1    340             
DBREF  2PUA B  699   715  PDB    2PUA     2PUA           699    715             
SEQADV 2PUA ALA A  190  UNP  P0ACP7    ARG   189 ENGINEERED MUTATION            
SEQRES   1 B   17   DT  DA  DC  DG  DC  DA  DA  DA  DC  DG  DT  DT  DT          
SEQRES   2 B   17   DG  DC  DG  DT                                              
SEQRES   1 A  340  ALA THR ILE LYS ASP VAL ALA LYS ARG ALA ASN VAL SER          
SEQRES   2 A  340  THR THR THR VAL SER HIS VAL ILE ASN LYS THR ARG PHE          
SEQRES   3 A  340  VAL ALA GLU GLU THR ARG ASN ALA VAL TRP ALA ALA ILE          
SEQRES   4 A  340  LYS GLU LEU HIS TYR SER PRO SER ALA VAL ALA ARG SER          
SEQRES   5 A  340  LEU LYS VAL ASN HIS THR LYS SER ILE GLY LEU LEU ALA          
SEQRES   6 A  340  THR SER SER GLU ALA ALA TYR PHE ALA GLU ILE ILE GLU          
SEQRES   7 A  340  ALA VAL GLU LYS ASN CYS PHE GLN LYS GLY TYR THR LEU          
SEQRES   8 A  340  ILE LEU GLY ASN ALA TRP ASN ASN LEU GLU LYS GLN ARG          
SEQRES   9 A  340  ALA TYR LEU SER MET MET ALA GLN LYS ARG VAL ASP GLY          
SEQRES  10 A  340  LEU LEU VAL MET CYS SER GLU TYR PRO GLU PRO LEU LEU          
SEQRES  11 A  340  ALA MET LEU GLU GLU TYR ARG HIS ILE PRO MET VAL VAL          
SEQRES  12 A  340  MET ASP TRP GLY GLU ALA LYS ALA ASP PHE THR ASP ALA          
SEQRES  13 A  340  VAL ILE ASP ASN ALA PHE GLU GLY GLY TYR MET ALA GLY          
SEQRES  14 A  340  ARG TYR LEU ILE GLU ARG GLY HIS ARG GLU ILE GLY VAL          
SEQRES  15 A  340  ILE PRO GLY PRO LEU GLU ALA ASN THR GLY ALA GLY ARG          
SEQRES  16 A  340  LEU ALA GLY PHE MET LYS ALA MET GLU GLU ALA MET ILE          
SEQRES  17 A  340  LYS VAL PRO GLU SER TRP ILE VAL GLN GLY ASP PHE GLU          
SEQRES  18 A  340  PRO GLU SER GLY TYR ARG ALA MET GLN GLN ILE LEU SER          
SEQRES  19 A  340  GLN PRO HIS ARG PRO THR ALA VAL PHE CYS GLY GLY ASP          
SEQRES  20 A  340  ILE MET ALA MET GLY ALA LEU CYS ALA ALA ASP GLU MET          
SEQRES  21 A  340  GLY LEU ARG VAL PRO GLN ASP VAL SER LEU ILE GLY TYR          
SEQRES  22 A  340  ASP ASN VAL ARG ASN ALA ARG TYR PHE THR PRO ALA LEU          
SEQRES  23 A  340  THR THR ILE HIS GLN PRO LYS ASP SER LEU GLY GLU THR          
SEQRES  24 A  340  ALA PHE ASN MET LEU LEU ASP ARG ILE VAL ASN LYS ARG          
SEQRES  25 A  340  GLU GLU PRO GLN SER ILE GLU VAL HIS PRO ARG LEU ILE          
SEQRES  26 A  340  GLU ARG ARG SER VAL ALA ASP GLY PRO PHE ARG ASP TYR          
SEQRES  27 A  340  ARG ARG                                                      
HET    6MP  A 599      10                                                       
HETNAM     6MP 6-METHYLPURINE                                                   
FORMUL   3  6MP    C6 H6 N4                                                     
FORMUL   4  HOH   *59(H2 O)                                                     
HELIX    1   1 ILE A    4  ALA A   11  1                                   8    
HELIX    2   2 THR A   15  ASN A   23  1                                   9    
HELIX    3   3 GLU A   30  LEU A   43  1                                  14    
HELIX    4   4 ALA A   49  VAL A   56  1                                   8    
HELIX    5   5 ALA A   72  GLN A   87  1                                  16    
HELIX    6   6 LEU A  101  GLN A  113  1                                  13    
HELIX    7   7 GLU A  128  TYR A  137  1                                  10    
HELIX    8   8 ALA A  162  ARG A  176  1                                  15    
HELIX    9   9 ASN A  191  GLU A  206  1                                  16    
HELIX   10  10 GLU A  213  TRP A  215  5                                   3    
HELIX   11  11 PRO A  223  LEU A  234  1                                  12    
HELIX   12  12 ASP A  248  MET A  261  1                                  14    
HELIX   13  13 ALA A  280  TYR A  282  5                                   3    
HELIX   14  14 LYS A  294  VAL A  310  1                                  17    
SHEET    1   A 4 LEU A  92  ASN A  96  0                                        
SHEET    2   A 4 ILE A  62  ALA A  66  1  N  ILE A  62   O  ILE A  93           
SHEET    3   A 4 GLY A 118  MET A 122  1  N  GLY A 118   O  GLY A  63           
SHEET    4   A 4 PRO A 141  VAL A 144  1  N  PRO A 141   O  LEU A 119           
SHEET    1   B 2 ALA A 157  ILE A 159  0                                        
SHEET    2   B 2 SER A 318  GLU A 320  1  N  ILE A 319   O  ALA A 157           
SHEET    1   C 5 ILE A 181  ILE A 184  0                                        
SHEET    2   C 5 ALA A 242  CYS A 245  1  N  ALA A 242   O  GLY A 182           
SHEET    3   C 5 SER A 270  ASP A 275  1  N  SER A 270   O  VAL A 243           
SHEET    4   C 5 THR A 288  HIS A 291  1  N  THR A 288   O  GLY A 273           
SHEET    5   C 5 ARG A 324  ILE A 326 -1  N  ILE A 326   O  THR A 289           
CISPEP   1 VAL A  265    PRO A  266          0         3.47                     
CISPEP   2 THR A  284    PRO A  285          0         2.54                     
SITE     1 AC1  7 TYR A  73  PHE A  74  SER A 124  THR A 192                    
SITE     2 AC1  7 ARG A 196  PHE A 221  ASP A 275                               
CRYST1  175.650   94.680   81.830  90.00  90.00  90.00 C 2 2 21      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      0.005693  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.010562  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.012220        0.00000