HEADER    HYDROLASE                               30-JUN-05   2A5K              
TITLE     CRYSTAL STRUCTURES OF SARS CORONAVIRUS MAIN PEPTIDASE INHIBITED BY AN 
TITLE    2 AZA-PEPTIDE EPOXIDE IN SPACE GROUP P212121                           
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: 3C-LIKE PEPTIDASE;                                         
COMPND   3 CHAIN: A, B;                                                         
COMPND   4 SYNONYM: 3CL-PRO, 3CLP, NSP2;                                        
COMPND   5 EC: 3.4.22.-;                                                        
COMPND   6 ENGINEERED: YES;                                                     
COMPND   7 MUTATION: YES                                                        
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: SARS CORONAVIRUS;                               
SOURCE   3 ORGANISM_TAXID: 227859;                                              
SOURCE   4 STRAIN: SARS;                                                        
SOURCE   5 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   6 EXPRESSION_SYSTEM_TAXID: 562;                                        
SOURCE   7 EXPRESSION_SYSTEM_STRAIN: GJ1158;                                    
SOURCE   8 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID;                              
SOURCE   9 EXPRESSION_SYSTEM_PLASMID: PT7HSP2                                   
KEYWDS    CYSTEINE PEPTIDASE, 3C-LIKE, N-FINGER, CHYMOTRYPSIN-LIKE FOLD, LONG   
KEYWDS   2 LOOP, ALPHA-HELICAL DOMAIN, DIMER, CATALYTIC DYAD, SPECIFICITY       
KEYWDS   3 POCKETS, AZA-PEPTIDE EPOXIDE, SUBSTRATE-LIKE INHIBITOR, C-S COVALENT 
KEYWDS   4 BOND, EPOXIDE STEREOCHEMISTRY, HYDROLASE                             
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    T.-W.LEE,M.M.CHERNEY,C.HUITEMA,J.LIU,K.E.JAMES,J.C.POWERS,L.D.ELTIS,  
AUTHOR   2 M.N.JAMES                                                            
REVDAT   5   13-NOV-24 2A5K    1       REMARK                                   
REVDAT   4   23-AUG-23 2A5K    1       REMARK SEQADV LINK                       
REVDAT   3   24-FEB-09 2A5K    1       VERSN                                    
REVDAT   2   01-NOV-05 2A5K    1       JRNL                                     
REVDAT   1   25-OCT-05 2A5K    0                                                
JRNL        AUTH   T.-W.LEE,M.M.CHERNEY,C.HUITEMA,J.LIU,K.E.JAMES,J.C.POWERS,   
JRNL        AUTH 2 L.D.ELTIS,M.N.JAMES                                          
JRNL        TITL   CRYSTAL STRUCTURES OF THE MAIN PEPTIDASE FROM THE SARS       
JRNL        TITL 2 CORONAVIRUS INHIBITED BY A SUBSTRATE-LIKE AZA-PEPTIDE        
JRNL        TITL 3 EPOXIDE                                                      
JRNL        REF    J.MOL.BIOL.                   V. 353  1137 2005              
JRNL        REFN                   ISSN 0022-2836                               
JRNL        PMID   16219322                                                     
JRNL        DOI    10.1016/J.JMB.2005.09.004                                    
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.30 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : REFMAC 5.2.0005                                      
REMARK   3   AUTHORS     : MURSHUDOV,SKUBAK,LEBEDEV,PANNU,STEINER,              
REMARK   3               : NICHOLLS,WINN,LONG,VAGIN                             
REMARK   3                                                                      
REMARK   3    REFINEMENT TARGET : MAXIMUM LIKELIHOOD                            
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.30                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 40.00                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 0.000                          
REMARK   3   COMPLETENESS FOR RANGE        (%) : 99.1                           
REMARK   3   NUMBER OF REFLECTIONS             : 31565                          
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 + TEST SET) : 0.178                           
REMARK   3   R VALUE            (WORKING SET) : 0.175                           
REMARK   3   FREE R VALUE                     : 0.249                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 5.100                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 1684                            
REMARK   3                                                                      
REMARK   3  FIT IN THE HIGHEST RESOLUTION BIN.                                  
REMARK   3   TOTAL NUMBER OF BINS USED           : 20                           
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : 2.30                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 2.36                         
REMARK   3   REFLECTION IN BIN     (WORKING SET) : 2153                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : 92.90                        
REMARK   3   BIN R VALUE           (WORKING SET) : 0.2600                       
REMARK   3   BIN FREE R VALUE SET COUNT          : 110                          
REMARK   3   BIN FREE R VALUE                    : 0.3460                       
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 4676                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 92                                      
REMARK   3   SOLVENT ATOMS            : 278                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : NULL                           
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : 47.45                          
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : 3.01000                                              
REMARK   3    B22 (A**2) : -1.27000                                             
REMARK   3    B33 (A**2) : -1.74000                                             
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 OVERALL COORDINATE ERROR.                                 
REMARK   3   ESU BASED ON R VALUE                            (A): 0.283         
REMARK   3   ESU BASED ON FREE R VALUE                       (A): 0.237         
REMARK   3   ESU BASED ON MAXIMUM LIKELIHOOD                 (A): 0.174         
REMARK   3   ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): 14.506        
REMARK   3                                                                      
REMARK   3 CORRELATION COEFFICIENTS.                                            
REMARK   3   CORRELATION COEFFICIENT FO-FC      : 0.963                         
REMARK   3   CORRELATION COEFFICIENT FO-FC FREE : 0.931                         
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES        COUNT    RMS    WEIGHT      
REMARK   3   BOND LENGTHS REFINED ATOMS        (A):  5009 ; 0.021 ; 0.022       
REMARK   3   BOND LENGTHS OTHERS               (A):  NULL ;  NULL ;  NULL       
REMARK   3   BOND ANGLES REFINED ATOMS   (DEGREES):  6798 ; 1.944 ; 1.966       
REMARK   3   BOND ANGLES OTHERS          (DEGREES):  NULL ;  NULL ;  NULL       
REMARK   3   TORSION ANGLES, PERIOD 1    (DEGREES):   612 ; 7.517 ; 5.000       
REMARK   3   TORSION ANGLES, PERIOD 2    (DEGREES):   230 ;37.716 ;23.913       
REMARK   3   TORSION ANGLES, PERIOD 3    (DEGREES):   825 ;18.855 ;15.000       
REMARK   3   TORSION ANGLES, PERIOD 4    (DEGREES):    32 ;22.179 ;15.000       
REMARK   3   CHIRAL-CENTER RESTRAINTS       (A**3):   758 ; 0.129 ; 0.200       
REMARK   3   GENERAL PLANES REFINED ATOMS      (A):  3833 ; 0.008 ; 0.020       
REMARK   3   GENERAL PLANES OTHERS             (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED CONTACTS REFINED ATOMS (A):  2347 ; 0.254 ; 0.300       
REMARK   3   NON-BONDED CONTACTS OTHERS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED TORSION REFINED ATOMS  (A):  3428 ; 0.333 ; 0.500       
REMARK   3   NON-BONDED TORSION OTHERS         (A):  NULL ;  NULL ;  NULL       
REMARK   3   H-BOND (X...Y) REFINED ATOMS      (A):   479 ; 0.236 ; 0.500       
REMARK   3   H-BOND (X...Y) OTHERS             (A):  NULL ;  NULL ;  NULL       
REMARK   3   POTENTIAL METAL-ION REFINED ATOMS (A):  NULL ;  NULL ;  NULL       
REMARK   3   POTENTIAL METAL-ION OTHERS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY VDW REFINED ATOMS        (A):    46 ; 0.292 ; 0.300       
REMARK   3   SYMMETRY VDW OTHERS               (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY H-BOND REFINED ATOMS     (A):    12 ; 0.284 ; 0.500       
REMARK   3   SYMMETRY H-BOND OTHERS            (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY METAL-ION REFINED ATOMS  (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY METAL-ION OTHERS         (A):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.     COUNT   RMS    WEIGHT      
REMARK   3   MAIN-CHAIN BOND REFINED ATOMS  (A**2):  3113 ; 1.602 ; 2.000       
REMARK   3   MAIN-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   MAIN-CHAIN ANGLE REFINED ATOMS (A**2):  4946 ; 2.529 ; 3.000       
REMARK   3   MAIN-CHAIN ANGLE OTHER ATOMS   (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN BOND REFINED ATOMS  (A**2):  2123 ; 1.616 ; 2.000       
REMARK   3   SIDE-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN ANGLE REFINED ATOMS (A**2):  1852 ; 2.285 ; 3.000       
REMARK   3   SIDE-CHAIN ANGLE OTHER ATOMS   (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   LONG RANGE B REFINED ATOMS     (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   LONG RANGE B OTHER ATOMS       (A**2):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3 ANISOTROPIC THERMAL FACTOR RESTRAINTS.    COUNT   RMS   WEIGHT       
REMARK   3   RIGID-BOND RESTRAINTS          (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SPHERICITY; FREE ATOMS         (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SPHERICITY; BONDED ATOMS       (A**2):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3  NCS RESTRAINTS STATISTICS                                           
REMARK   3   NUMBER OF DIFFERENT NCS GROUPS : NULL                              
REMARK   3                                                                      
REMARK   3  TLS DETAILS                                                         
REMARK   3   NUMBER OF TLS GROUPS  : NULL                                       
REMARK   3                                                                      
REMARK   3  BULK SOLVENT MODELLING.                                             
REMARK   3   METHOD USED : BABINET MODEL WITH MASK                              
REMARK   3   PARAMETERS FOR MASK CALCULATION                                    
REMARK   3   VDW PROBE RADIUS   : 1.20                                          
REMARK   3   ION PROBE RADIUS   : 0.80                                          
REMARK   3   SHRINKAGE RADIUS   : 0.80                                          
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: NULL                                      
REMARK   4                                                                      
REMARK   4 2A5K COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 11-JUL-05.                  
REMARK 100 THE DEPOSITION ID IS D_1000033514.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 25-AUG-04                          
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               : ALS                                
REMARK 200  BEAMLINE                       : 8.3.1                              
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 1.115869                           
REMARK 200  MONOCHROMATOR                  : NULL                               
REMARK 200  OPTICS                         : NULL                               
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : CCD                                
REMARK 200  DETECTOR MANUFACTURER          : ADSC QUANTUM 210                   
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : DENZO                              
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 33305                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.300                              
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     (%) : 99.2                               
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) : 2.30                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 2.38                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 95.5                               
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: MOLREP                                                
REMARK 200 STARTING MODEL: PDB ENTRY 2A5A                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 54.90                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.73                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: AMMONIUM ACETATE, PEG 8000, ETHYLENE     
REMARK 280  GLYCOL, DITHIOTHREITOL, MES, PH 6.5, VAPOR DIFFUSION, HANGING       
REMARK 280  DROP, TEMPERATURE 298K                                              
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 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                                                                      
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       32.67650            
REMARK 290   SMTRY2   2  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000  1.000000       83.66100            
REMARK 290   SMTRY1   3 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       33.73900            
REMARK 290   SMTRY3   3  0.000000  0.000000 -1.000000       83.66100            
REMARK 290   SMTRY1   4  1.000000  0.000000  0.000000       32.67650            
REMARK 290   SMTRY2   4  0.000000 -1.000000  0.000000       33.73900            
REMARK 290   SMTRY3   4  0.000000  0.000000 -1.000000        0.00000            
REMARK 290                                                                      
REMARK 290 REMARK: NULL                                                         
REMARK 300                                                                      
REMARK 300 BIOMOLECULE: 1                                                       
REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM                
REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN                  
REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON               
REMARK 300 BURIED SURFACE AREA.                                                 
REMARK 350                                                                      
REMARK 350 COORDINATES FOR A COMPLETE MULTIMER REPRESENTING THE KNOWN           
REMARK 350 BIOLOGICALLY SIGNIFICANT OLIGOMERIZATION STATE OF THE                
REMARK 350 MOLECULE CAN BE GENERATED BY APPLYING BIOMT TRANSFORMATIONS          
REMARK 350 GIVEN BELOW.  BOTH NON-CRYSTALLOGRAPHIC AND                          
REMARK 350 CRYSTALLOGRAPHIC OPERATIONS ARE GIVEN.                               
REMARK 350                                                                      
REMARK 350 BIOMOLECULE: 1                                                       
REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: DIMERIC                           
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 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     ALA A     0                                                      
REMARK 465     PHE A   305                                                      
REMARK 465     GLN A   306                                                      
REMARK 465     ALA B     0                                                      
REMARK 465     SER B   301                                                      
REMARK 465     GLY B   302                                                      
REMARK 465     VAL B   303                                                      
REMARK 465     THR B   304                                                      
REMARK 465     PHE B   305                                                      
REMARK 465     GLN B   306                                                      
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: CLOSE CONTACTS IN SAME ASYMMETRIC UNIT                     
REMARK 500                                                                      
REMARK 500 THE FOLLOWING ATOMS ARE IN CLOSE CONTACT.                            
REMARK 500                                                                      
REMARK 500  ATM1  RES C  SSEQI   ATM2  RES C  SSEQI           DISTANCE          
REMARK 500   O    HOH A   372     O    HOH A   374              2.18            
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
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    THR B 224   C     THR B 224   O       0.118                       
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    LEU A  67   CA  -  CB  -  CG  ANGL. DEV. =  14.2 DEGREES          
REMARK 500    CYS A 128   CA  -  CB  -  SG  ANGL. DEV. =   6.6 DEGREES          
REMARK 500    LEU A 167   CA  -  CB  -  CG  ANGL. DEV. =  14.2 DEGREES          
REMARK 500    ARG B   4   NE  -  CZ  -  NH1 ANGL. DEV. =  -4.7 DEGREES          
REMARK 500    LEU B  87   CB  -  CG  -  CD1 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    ASP A  33     -129.94     49.00                                   
REMARK 500    ASN A  51       62.25   -159.18                                   
REMARK 500    ASN A  84     -121.36     47.69                                   
REMARK 500    TYR A 154     -108.03     65.24                                   
REMARK 500    PRO A 184       35.10    -82.97                                   
REMARK 500    THR A 285     -158.35    -81.59                                   
REMARK 500    ILE A 286      130.83     53.94                                   
REMARK 500    ILE A 286      130.83     90.83                                   
REMARK 500    ASP B  33     -122.18     46.22                                   
REMARK 500    ASN B  84     -121.34     50.52                                   
REMARK 500    TYR B 154      -71.14     54.85                                   
REMARK 500    PRO B 184       38.01    -89.93                                   
REMARK 500    GLN B 192      141.71   -178.18                                   
REMARK 500    ASN B 214        0.21    -60.17                                   
REMARK 500    ARG B 217       -5.81   -149.37                                   
REMARK 500    ARG B 279     -179.16    -63.82                                   
REMARK 500    ARG B 279      178.53    -53.93                                   
REMARK 500    ILE B 286      139.36     56.01                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 600                                                                      
REMARK 600 HETEROGEN BEFORE BINDING TO THE PEPTIDASE, CBM, CBO AND OBN FORM     
REMARK 600 AN EPOXIDE RING IN AZP. UPON BINDING TO THE PEPTIDASE, CYS145 SG     
REMARK 600 NUCLEOPHILLICALLY ATTACKS CBM, RESULTING IN THE OPENING OF THE       
REMARK 600 RING AND THE INVERSION OF THE CONFIGURATIONS OF CBM AND CBO.         
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE AZP A 307                 
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC2                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE AZP B 307                 
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 2A5A   RELATED DB: PDB                                   
REMARK 900 CRYSTAL STRUCTURE OF SARS CORONAVIRUS MAIN PEPTIDASE UNBOUND IN THE  
REMARK 900 CRYSTAL FORM C2                                                      
REMARK 900 RELATED ID: 2A5I   RELATED DB: PDB                                   
REMARK 900 CRYSTAL STRUCTURE OF SARS CORONAVIRUS MAIN PEPTIDASE INHIBITED BY    
REMARK 900 AN AZA-PEPTIDE EPOXIDE IN THE CRYSTAL FORM C2                        
DBREF  2A5K A    1   306  UNP    P59641   R1AB_CVHSA    3241   3546             
DBREF  2A5K B    1   306  UNP    P59641   R1AB_CVHSA    3241   3546             
SEQADV 2A5K ALA A    0  UNP  P59641              EXPRESSION TAG                 
SEQADV 2A5K ALA B    0  UNP  P59641              EXPRESSION TAG                 
SEQRES   1 A  307  ALA SER GLY PHE ARG LYS MET ALA PHE PRO SER GLY LYS          
SEQRES   2 A  307  VAL GLU GLY CYS MET VAL GLN VAL THR CYS GLY THR THR          
SEQRES   3 A  307  THR LEU ASN GLY LEU TRP LEU ASP ASP THR VAL TYR CYS          
SEQRES   4 A  307  PRO ARG HIS VAL ILE CYS THR ALA GLU ASP MET LEU ASN          
SEQRES   5 A  307  PRO ASN TYR GLU ASP LEU LEU ILE ARG LYS SER ASN HIS          
SEQRES   6 A  307  SER PHE LEU VAL GLN ALA GLY ASN VAL GLN LEU ARG VAL          
SEQRES   7 A  307  ILE GLY HIS SER MET GLN ASN CYS LEU LEU ARG LEU LYS          
SEQRES   8 A  307  VAL ASP THR SER ASN PRO LYS THR PRO LYS TYR LYS PHE          
SEQRES   9 A  307  VAL ARG ILE GLN PRO GLY GLN THR PHE SER VAL LEU ALA          
SEQRES  10 A  307  CYS TYR ASN GLY SER PRO SER GLY VAL TYR GLN CYS ALA          
SEQRES  11 A  307  MET ARG PRO ASN HIS THR ILE LYS GLY SER PHE LEU ASN          
SEQRES  12 A  307  GLY SER CYS GLY SER VAL GLY PHE ASN ILE ASP TYR ASP          
SEQRES  13 A  307  CYS VAL SER PHE CYS TYR MET HIS HIS MET GLU LEU PRO          
SEQRES  14 A  307  THR GLY VAL HIS ALA GLY THR ASP LEU GLU GLY LYS PHE          
SEQRES  15 A  307  TYR GLY PRO PHE VAL ASP ARG GLN THR ALA GLN ALA ALA          
SEQRES  16 A  307  GLY THR ASP THR THR ILE THR LEU ASN VAL LEU ALA TRP          
SEQRES  17 A  307  LEU TYR ALA ALA VAL ILE ASN GLY ASP ARG TRP PHE LEU          
SEQRES  18 A  307  ASN ARG PHE THR THR THR LEU ASN ASP PHE ASN LEU VAL          
SEQRES  19 A  307  ALA MET LYS TYR ASN TYR GLU PRO LEU THR GLN ASP HIS          
SEQRES  20 A  307  VAL ASP ILE LEU GLY PRO LEU SER ALA GLN THR GLY ILE          
SEQRES  21 A  307  ALA VAL LEU ASP MET CYS ALA ALA LEU LYS GLU LEU LEU          
SEQRES  22 A  307  GLN ASN GLY MET ASN GLY ARG THR ILE LEU GLY SER THR          
SEQRES  23 A  307  ILE LEU GLU ASP GLU PHE THR PRO PHE ASP VAL VAL ARG          
SEQRES  24 A  307  GLN CYS SER GLY VAL THR PHE GLN                              
SEQRES   1 B  307  ALA SER GLY PHE ARG LYS MET ALA PHE PRO SER GLY LYS          
SEQRES   2 B  307  VAL GLU GLY CYS MET VAL GLN VAL THR CYS GLY THR THR          
SEQRES   3 B  307  THR LEU ASN GLY LEU TRP LEU ASP ASP THR VAL TYR CYS          
SEQRES   4 B  307  PRO ARG HIS VAL ILE CYS THR ALA GLU ASP MET LEU ASN          
SEQRES   5 B  307  PRO ASN TYR GLU ASP LEU LEU ILE ARG LYS SER ASN HIS          
SEQRES   6 B  307  SER PHE LEU VAL GLN ALA GLY ASN VAL GLN LEU ARG VAL          
SEQRES   7 B  307  ILE GLY HIS SER MET GLN ASN CYS LEU LEU ARG LEU LYS          
SEQRES   8 B  307  VAL ASP THR SER ASN PRO LYS THR PRO LYS TYR LYS PHE          
SEQRES   9 B  307  VAL ARG ILE GLN PRO GLY GLN THR PHE SER VAL LEU ALA          
SEQRES  10 B  307  CYS TYR ASN GLY SER PRO SER GLY VAL TYR GLN CYS ALA          
SEQRES  11 B  307  MET ARG PRO ASN HIS THR ILE LYS GLY SER PHE LEU ASN          
SEQRES  12 B  307  GLY SER CYS GLY SER VAL GLY PHE ASN ILE ASP TYR ASP          
SEQRES  13 B  307  CYS VAL SER PHE CYS TYR MET HIS HIS MET GLU LEU PRO          
SEQRES  14 B  307  THR GLY VAL HIS ALA GLY THR ASP LEU GLU GLY LYS PHE          
SEQRES  15 B  307  TYR GLY PRO PHE VAL ASP ARG GLN THR ALA GLN ALA ALA          
SEQRES  16 B  307  GLY THR ASP THR THR ILE THR LEU ASN VAL LEU ALA TRP          
SEQRES  17 B  307  LEU TYR ALA ALA VAL ILE ASN GLY ASP ARG TRP PHE LEU          
SEQRES  18 B  307  ASN ARG PHE THR THR THR LEU ASN ASP PHE ASN LEU VAL          
SEQRES  19 B  307  ALA MET LYS TYR ASN TYR GLU PRO LEU THR GLN ASP HIS          
SEQRES  20 B  307  VAL ASP ILE LEU GLY PRO LEU SER ALA GLN THR GLY ILE          
SEQRES  21 B  307  ALA VAL LEU ASP MET CYS ALA ALA LEU LYS GLU LEU LEU          
SEQRES  22 B  307  GLN ASN GLY MET ASN GLY ARG THR ILE LEU GLY SER THR          
SEQRES  23 B  307  ILE LEU GLU ASP GLU PHE THR PRO PHE ASP VAL VAL ARG          
SEQRES  24 B  307  GLN CYS SER GLY VAL THR PHE GLN                              
HET    AZP  A 307      46                                                       
HET    AZP  B 307      46                                                       
HETNAM     AZP (5S,8S,14R)-ETHYL 11-(3-AMINO-3-OXOPROPYL)-8-BENZYL-14-          
HETNAM   2 AZP  HYDROXY-5-ISOBUTYL-3,6,9,12-TETRAOXO-1-PHENYL-2-OXA-4,          
HETNAM   3 AZP  7,10,11-TETRAAZAPENTADECAN-15-OATE                              
FORMUL   3  AZP    2(C32 H43 N5 O9)                                             
FORMUL   5  HOH   *278(H2 O)                                                    
HELIX    1   1 SER A   10  GLY A   15  1                                   6    
HELIX    2   2 HIS A   41  CYS A   44  5                                   4    
HELIX    3   3 ASN A   53  ARG A   60  1                                   8    
HELIX    4   4 SER A   62  PHE A   66  5                                   5    
HELIX    5   5 ILE A  200  ASN A  214  1                                  15    
HELIX    6   6 THR A  226  TYR A  237  1                                  12    
HELIX    7   7 THR A  243  LEU A  250  1                                   8    
HELIX    8   8 LEU A  250  GLY A  258  1                                   9    
HELIX    9   9 ALA A  260  GLY A  275  1                                  16    
HELIX   10  10 THR A  292  GLY A  302  1                                  11    
HELIX   11  11 SER B   10  GLY B   15  1                                   6    
HELIX   12  12 HIS B   41  CYS B   44  5                                   4    
HELIX   13  13 THR B   45  MET B   49  5                                   5    
HELIX   14  14 ASN B   53  LYS B   61  1                                   9    
HELIX   15  15 SER B   62  PHE B   66  5                                   5    
HELIX   16  16 ILE B  200  GLY B  215  1                                  16    
HELIX   17  17 THR B  226  TYR B  237  1                                  12    
HELIX   18  18 THR B  243  LEU B  250  1                                   8    
HELIX   19  19 LEU B  250  GLY B  258  1                                   9    
HELIX   20  20 ALA B  260  GLY B  275  1                                  16    
HELIX   21  21 THR B  292  GLN B  299  1                                   8    
SHEET    1   A 7 VAL A  73  LEU A  75  0                                        
SHEET    2   A 7 LEU A  67  ALA A  70 -1  N  ALA A  70   O  VAL A  73           
SHEET    3   A 7 MET A  17  CYS A  22 -1  N  THR A  21   O  LEU A  67           
SHEET    4   A 7 THR A  25  LEU A  32 -1  O  LEU A  27   N  VAL A  20           
SHEET    5   A 7 THR A  35  PRO A  39 -1  O  TYR A  37   N  LEU A  30           
SHEET    6   A 7 LEU A  86  VAL A  91 -1  O  LEU A  89   N  VAL A  36           
SHEET    7   A 7 VAL A  77  GLN A  83 -1  N  GLN A  83   O  LEU A  86           
SHEET    1   B 5 TYR A 101  PHE A 103  0                                        
SHEET    2   B 5 CYS A 156  GLU A 166  1  O  PHE A 159   N  LYS A 102           
SHEET    3   B 5 VAL A 148  ASP A 153 -1  N  ASN A 151   O  SER A 158           
SHEET    4   B 5 THR A 111  TYR A 118 -1  N  SER A 113   O  PHE A 150           
SHEET    5   B 5 SER A 121  ALA A 129 -1  O  TYR A 126   N  VAL A 114           
SHEET    1   C 3 TYR A 101  PHE A 103  0                                        
SHEET    2   C 3 CYS A 156  GLU A 166  1  O  PHE A 159   N  LYS A 102           
SHEET    3   C 3 HIS A 172  THR A 175 -1  O  ALA A 173   N  MET A 165           
SHEET    1   D 7 VAL B  73  LEU B  75  0                                        
SHEET    2   D 7 LEU B  67  ALA B  70 -1  N  ALA B  70   O  VAL B  73           
SHEET    3   D 7 MET B  17  CYS B  22 -1  N  THR B  21   O  LEU B  67           
SHEET    4   D 7 THR B  25  LEU B  32 -1  O  GLY B  29   N  VAL B  18           
SHEET    5   D 7 THR B  35  PRO B  39 -1  O  TYR B  37   N  LEU B  30           
SHEET    6   D 7 LEU B  86  VAL B  91 -1  O  LEU B  87   N  CYS B  38           
SHEET    7   D 7 VAL B  77  GLN B  83 -1  N  ILE B  78   O  LYS B  90           
SHEET    1   E 5 TYR B 101  PHE B 103  0                                        
SHEET    2   E 5 CYS B 156  GLU B 166  1  O  VAL B 157   N  LYS B 102           
SHEET    3   E 5 VAL B 148  ASP B 153 -1  N  ASN B 151   O  SER B 158           
SHEET    4   E 5 THR B 111  TYR B 118 -1  N  SER B 113   O  PHE B 150           
SHEET    5   E 5 SER B 121  ALA B 129 -1  O  TYR B 126   N  VAL B 114           
SHEET    1   F 3 TYR B 101  PHE B 103  0                                        
SHEET    2   F 3 CYS B 156  GLU B 166  1  O  VAL B 157   N  LYS B 102           
SHEET    3   F 3 HIS B 172  THR B 175 -1  O  ALA B 173   N  MET B 165           
LINK         SG  CYS A 145                 CBM AZP A 307     1555   1555  2.09  
LINK         SG  CYS B 145                 CBM AZP B 307     1555   1555  2.05  
SITE     1 AC1 26 THR A  25  HIS A  41  MET A  49  TYR A  54                    
SITE     2 AC1 26 PHE A 140  LEU A 141  ASN A 142  GLY A 143                    
SITE     3 AC1 26 SER A 144  CYS A 145  HIS A 163  HIS A 164                    
SITE     4 AC1 26 MET A 165  GLU A 166  LEU A 167  HIS A 172                    
SITE     5 AC1 26 PHE A 185  ASP A 187  ARG A 188  GLN A 189                    
SITE     6 AC1 26 THR A 190  GLN A 192  LYS A 236  HOH A 328                    
SITE     7 AC1 26 HOH A 348  HOH A 397                                          
SITE     1 AC2 21 THR B  25  HIS B  41  MET B  49  TYR B  54                    
SITE     2 AC2 21 PHE B 140  LEU B 141  ASN B 142  GLY B 143                    
SITE     3 AC2 21 SER B 144  CYS B 145  HIS B 163  HIS B 164                    
SITE     4 AC2 21 MET B 165  GLU B 166  PRO B 168  HIS B 172                    
SITE     5 AC2 21 ASP B 187  ARG B 188  GLN B 189  THR B 190                    
SITE     6 AC2 21 ALA B 191                                                     
CRYST1   65.353   67.478  167.322  90.00  90.00  90.00 P 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      0.015302  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.014820  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.005977        0.00000