PDB Short entry for 1PFB
HEADER    PEPTIDE BINDING PROTEIN                 24-MAY-03   1PFB              
TITLE     STRUCTURAL BASIS FOR SPECIFIC BINDING OF POLYCOMB CHROMODOMAIN TO     
TITLE    2 HISTONE H3 METHYLATED AT K27                                         
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: POLYCOMB PROTEIN;                                          
COMPND   3 CHAIN: A;                                                            
COMPND   4 FRAGMENT: CHROMODOMAIN;                                              
COMPND   5 ENGINEERED: YES;                                                     
COMPND   6 MOL_ID: 2;                                                           
COMPND   7 MOLECULE: HISTONE H3, EMBRYONIC;                                     
COMPND   8 CHAIN: B;                                                            
COMPND   9 ENGINEERED: YES                                                      
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: DROSOPHILA MELANOGASTER;                        
SOURCE   3 ORGANISM_COMMON: FRUIT FLY;                                          
SOURCE   4 ORGANISM_TAXID: 7227;                                                
SOURCE   5 GENE: PC OR CG7618;                                                  
SOURCE   6 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   7 EXPRESSION_SYSTEM_TAXID: 562;                                        
SOURCE   8 MOL_ID: 2;                                                           
SOURCE   9 SYNTHETIC: YES;                                                      
SOURCE  10 OTHER_DETAILS: THE PEPTIDE WAS CHEMICALLY SYNTHESIZED. IT IS         
SOURCE  11 NATURALLY FOUND IN STRONGYLOCENTROTUS PURPURATUS.                    
KEYWDS    CHROMATIN, HISTONE METHYLATION, POLYCOMB, CHROMODOMAIN, PEPTIDE       
KEYWDS   2 BINDING PROTEIN                                                      
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    J.R.MIN,Y.ZHANG,R.-M.XU                                               
REVDAT   3   11-OCT-17 1PFB    1       REMARK                                   
REVDAT   2   24-FEB-09 1PFB    1       VERSN                                    
REVDAT   1   07-OCT-03 1PFB    0                                                
JRNL        AUTH   J.R.MIN,Y.ZHANG,R.-M.XU                                      
JRNL        TITL   STRUCTURAL BASIS FOR SPECIFIC BINDING OF POLYCOMB            
JRNL        TITL 2 CHROMODOMAIN TO HISTONE H3 METHYLATED AT LYS 27.             
JRNL        REF    GENES DEV.                    V.  17  1823 2003              
JRNL        REFN                   ISSN 0890-9369                               
JRNL        PMID   12897052                                                     
JRNL        DOI    10.1101/GAD.269603                                           
REMARK   2                                                                      
REMARK   2 RESOLUTION.    1.40 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : CNS                                                  
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) : 1.40                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 27.28                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 0.000                          
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             : 17050                          
REMARK   3                                                                      
REMARK   3  FIT TO DATA USED IN REFINEMENT.                                     
REMARK   3   CROSS-VALIDATION METHOD          : NULL                            
REMARK   3   FREE R VALUE TEST SET SELECTION  : RANDOM                          
REMARK   3   R VALUE            (WORKING SET) : 0.197                           
REMARK   3   FREE R VALUE                     : 0.216                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : NULL                            
REMARK   3   FREE R VALUE TEST SET COUNT      : 1701                            
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            : 559                                     
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 10                                      
REMARK   3   SOLVENT ATOMS            : 147                                     
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) : NULL                                                 
REMARK   3    B22 (A**2) : NULL                                                 
REMARK   3    B33 (A**2) : NULL                                                 
REMARK   3    B12 (A**2) : NULL                                                 
REMARK   3    B13 (A**2) : NULL                                                 
REMARK   3    B23 (A**2) : NULL                                                 
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) : NULL                            
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) : 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 : NULL                                                 
REMARK   3   KSOL        : NULL                                                 
REMARK   3   BSOL        : NULL                                                 
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 1PFB COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 05-JUN-03.                  
REMARK 100 THE DEPOSITION ID IS D_1000019290.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 19-NOV-02                          
REMARK 200  TEMPERATURE           (KELVIN) : 100                                
REMARK 200  PH                             : 6.5                                
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : Y                                  
REMARK 200  RADIATION SOURCE               : NSLS                               
REMARK 200  BEAMLINE                       : X26C                               
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 1.1                                
REMARK 200  MONOCHROMATOR                  : GRAPHITE                           
REMARK 200  OPTICS                         : NULL                               
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : CCD                                
REMARK 200  DETECTOR MANUFACTURER          : ADSC QUANTUM 4                     
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : MADNESS                            
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 17050                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 1.400                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 50.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : 0.000                              
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 86.8                               
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) : 1.40                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 1.45                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 42.3                               
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: AMORE                                                 
REMARK 200 STARTING MODEL: NULL                                                 
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 59.39                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 3.03                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: 30% PEG8000, 200MM AMMONIUM SULFATE,     
REMARK 280  PH 6.5, VAPOR DIFFUSION, HANGING DROP, TEMPERATURE 290K             
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: I 21 21 21                       
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X+1/2,-Y,Z+1/2                                         
REMARK 290       3555   -X,Y+1/2,-Z+1/2                                         
REMARK 290       4555   X+1/2,-Y+1/2,-Z                                         
REMARK 290       5555   X+1/2,Y+1/2,Z+1/2                                       
REMARK 290       6555   -X,-Y+1/2,Z                                             
REMARK 290       7555   -X+1/2,Y,-Z                                             
REMARK 290       8555   X,-Y,-Z+1/2                                             
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       16.21450            
REMARK 290   SMTRY2   2  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000  1.000000       38.63650            
REMARK 290   SMTRY1   3 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       38.51650            
REMARK 290   SMTRY3   3  0.000000  0.000000 -1.000000       38.63650            
REMARK 290   SMTRY1   4  1.000000  0.000000  0.000000       16.21450            
REMARK 290   SMTRY2   4  0.000000 -1.000000  0.000000       38.51650            
REMARK 290   SMTRY3   4  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   5  1.000000  0.000000  0.000000       16.21450            
REMARK 290   SMTRY2   5  0.000000  1.000000  0.000000       38.51650            
REMARK 290   SMTRY3   5  0.000000  0.000000  1.000000       38.63650            
REMARK 290   SMTRY1   6 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   6  0.000000 -1.000000  0.000000       38.51650            
REMARK 290   SMTRY3   6  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   7 -1.000000  0.000000  0.000000       16.21450            
REMARK 290   SMTRY2   7  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   7  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   8  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   8  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   8  0.000000  0.000000 -1.000000       38.63650            
REMARK 290                                                                      
REMARK 290 REMARK: NULL                                                         
REMARK 300                                                                      
REMARK 300 BIOMOLECULE: 1, 2                                                    
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: DIMERIC                           
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DIMERIC                    
REMARK 350 SOFTWARE USED: PISA                                                  
REMARK 350 TOTAL BURIED SURFACE AREA: 1560 ANGSTROM**2                          
REMARK 350 SURFACE AREA OF THE COMPLEX: 4880 ANGSTROM**2                        
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -8.0 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                                                                      
REMARK 350 BIOMOLECULE: 2                                                       
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TETRAMERIC                 
REMARK 350 SOFTWARE USED: PISA                                                  
REMARK 350 TOTAL BURIED SURFACE AREA: 4300 ANGSTROM**2                          
REMARK 350 SURFACE AREA OF THE COMPLEX: 8830 ANGSTROM**2                        
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -36.0 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       32.42900            
REMARK 350   BIOMT2   2  0.000000 -1.000000  0.000000       38.51650            
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 CL    CL A 203  LIES ON A SPECIAL POSITION.                          
REMARK 375 CL    CL A 204  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 205  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 332  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 339  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 340  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 341  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH B   2  LIES ON A SPECIAL POSITION.                          
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  77    CG   CD   CE   NZ                                   
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: CLOSE CONTACTS                                             
REMARK 500                                                                      
REMARK 500 THE FOLLOWING ATOMS THAT ARE RELATED BY CRYSTALLOGRAPHIC             
REMARK 500 SYMMETRY ARE IN CLOSE CONTACT.  AN ATOM LOCATED WITHIN 0.15          
REMARK 500 ANGSTROMS OF A SYMMETRY RELATED ATOM IS ASSUMED TO BE ON A           
REMARK 500 SPECIAL POSITION AND IS, THEREFORE, LISTED IN REMARK 375             
REMARK 500 INSTEAD OF REMARK 500.  ATOMS WITH NON-BLANK ALTERNATE               
REMARK 500 LOCATION INDICATORS ARE NOT INCLUDED IN THE CALCULATIONS.            
REMARK 500                                                                      
REMARK 500 DISTANCE CUTOFF:                                                     
REMARK 500 2.2 ANGSTROMS FOR CONTACTS NOT INVOLVING HYDROGEN ATOMS              
REMARK 500 1.6 ANGSTROMS FOR CONTACTS INVOLVING HYDROGEN ATOMS                  
REMARK 500                                                                      
REMARK 500  ATM1  RES C  SSEQI   ATM2  RES C  SSEQI  SSYMOP   DISTANCE          
REMARK 500   O    HOH A   206     O    HOH A   206     8565     1.48            
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 CL A 203                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC2                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CL A 204                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC3                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE BME A 202                 
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC4                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ACY A 201                 
DBREF  1PFB A   23    77  UNP    P26017   PC_DROME        23     77             
DBREF  1PFB B   20    30  UNP    P06352   H3_STRPU        20     30             
SEQADV 1PFB M3L B   27  UNP  P06352    LYS    27 MODIFIED RESIDUE               
SEQRES   1 A   55  ASP LEU VAL TYR ALA ALA GLU LYS ILE ILE GLN LYS ARG          
SEQRES   2 A   55  VAL LYS LYS GLY VAL VAL GLU TYR ARG VAL LYS TRP LYS          
SEQRES   3 A   55  GLY TRP ASN GLN ARG TYR ASN THR TRP GLU PRO GLU VAL          
SEQRES   4 A   55  ASN ILE LEU ASP ARG ARG LEU ILE ASP ILE TYR GLU GLN          
SEQRES   5 A   55  THR ASN LYS                                                  
SEQRES   1 B   11  LEU ALA THR LYS ALA ALA ARG M3L SER ALA PRO                  
MODRES 1PFB M3L B   27  LYS  N-TRIMETHYLLYSINE                                  
HET    M3L  B  27      12                                                       
HET     CL  A 203       1                                                       
HET     CL  A 204       1                                                       
HET    BME  A 202       4                                                       
HET    ACY  A 201       4                                                       
HETNAM     M3L N-TRIMETHYLLYSINE                                                
HETNAM      CL CHLORIDE ION                                                     
HETNAM     BME BETA-MERCAPTOETHANOL                                             
HETNAM     ACY ACETIC ACID                                                      
FORMUL   2  M3L    C9 H21 N2 O2 1+                                              
FORMUL   3   CL    2(CL 1-)                                                     
FORMUL   5  BME    C2 H6 O S                                                    
FORMUL   6  ACY    C2 H4 O2                                                     
FORMUL   7  HOH   *147(H2 O)                                                    
HELIX    1   1 ASN A   51  ASN A   55  5                                   5    
HELIX    2   2 VAL A   61  ILE A   63  5                                   3    
HELIX    3   3 ARG A   66  GLN A   74  1                                   9    
SHEET    1   A 4 THR A  56  PRO A  59  0                                        
SHEET    2   A 4 VAL A  40  TRP A  47 -1  N  VAL A  45   O  THR A  56           
SHEET    3   A 4 LEU A  24  LYS A  37 -1  N  LYS A  30   O  LYS A  46           
SHEET    4   A 4 LYS B  23  M3L B  27 -1  O  LYS B  23   N  ALA A  28           
LINK         C   ARG B  26                 N   M3L B  27     1555   1555  1.34  
LINK         C   M3L B  27                 N   SER B  28     1555   1555  1.34  
SITE     1 AC1  1 HOH A 303                                                     
SITE     1 AC2  3 ILE A  32  GLN A  33  HOH A 208                               
SITE     1 AC3  4 ARG A  44  ARG A  53  TYR A  54  HOH A 232                    
SITE     1 AC4  7 ARG A  35  LYS A  37  ARG A  53  HOH A 238                    
SITE     2 AC4  7 HOH A 243  HOH A 302  HOH A 340                               
CRYST1   32.429   77.033   77.273  90.00  90.00  90.00 I 21 21 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      0.030837  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.012981  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.012941        0.00000