HEADER    VIRAL PROTEIN                           25-APR-08   3CYO              
TITLE     STRUCTURE OF A LONGER THERMALSTABLE CORE DOMAIN OF HIV-1 GP41         
TITLE    2 CONTAINING THE ENFUVIRTIDE RESISTANCE MUTATION N43D AND COMPLEMENTARY
TITLE    3 MUTATION E137K                                                       
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: TRANSMEMBRANE PROTEIN;                                     
COMPND   3 CHAIN: A;                                                            
COMPND   4 FRAGMENT: FUSION PROTEIN OF UNP RESIDUES 536-579, LINKER, AND UNP    
COMPND   5 RESIDUES 628-663;                                                    
COMPND   6 SYNONYM: TM, GLYCOPROTEIN41, GP41;                                   
COMPND   7 ENGINEERED: YES;                                                     
COMPND   8 MUTATION: YES                                                        
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: HUMAN IMMUNODEFICIENCY VIRUS TYPE 1;            
SOURCE   3 GENE: ENV;                                                           
SOURCE   4 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   5 EXPRESSION_SYSTEM_TAXID: 562;                                        
SOURCE   6 EXPRESSION_SYSTEM_STRAIN: BL21(DE3)PLYSS;                            
SOURCE   7 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID;                              
SOURCE   8 EXPRESSION_SYSTEM_PLASMID: PET41A                                    
KEYWDS    HIV-1 ENVELOPE GLYCOPROTEIN, 6-HELIX BUNDLE, GP41, N43D, E137K, AIDS, 
KEYWDS   2 APOPTOSIS, COILED COIL, ENVELOPE PROTEIN, FUSION PROTEIN, HOST-VIRUS 
KEYWDS   3 INTERACTION, MEMBRANE, TRANSMEMBRANE, VIRION, VIRAL PROTEIN,         
KEYWDS   4 CLEAVAGE ON PAIR OF BASIC RESIDUES, LIPOPROTEIN, PALMITATE, VIRAL    
KEYWDS   5 IMMUNOEVASION                                                        
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    Z.M.WANG,J.J.DWYER                                                    
REVDAT   6   30-AUG-23 3CYO    1       REMARK                                   
REVDAT   5   20-OCT-21 3CYO    1       SEQADV                                   
REVDAT   4   16-AUG-17 3CYO    1       SOURCE REMARK                            
REVDAT   3   14-APR-10 3CYO    1       JRNL                                     
REVDAT   2   24-FEB-09 3CYO    1       VERSN                                    
REVDAT   1   17-JUN-08 3CYO    0                                                
JRNL        AUTH   X.BAI,K.L.WILSON,J.E.SEEDORFF,D.AHRENS,J.GREEN,D.K.DAVISON,  
JRNL        AUTH 2 L.JIN,S.A.STANFIELD-OAKLEY,S.M.MOSIER,T.E.MELBY,N.CAMMACK,   
JRNL        AUTH 3 Z.WANG,M.L.GREENBERG,J.J.DWYER                               
JRNL        TITL   IMPACT OF THE ENFUVIRTIDE RESISTANCE MUTATION N43D AND THE   
JRNL        TITL 2 ASSOCIATED BASELINE POLYMORPHISM E137K ON PEPTIDE            
JRNL        TITL 3 SENSITIVITY AND SIX-HELIX BUNDLE STRUCTURE.                  
JRNL        REF    BIOCHEMISTRY                  V.  47  6662 2008              
JRNL        REFN                   ISSN 0006-2960                               
JRNL        PMID   18507398                                                     
JRNL        DOI    10.1021/BI702509D                                            
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.10 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) : 2.10                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 50.00                          
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)   (%) : 91.8                           
REMARK   3   NUMBER OF REFLECTIONS             : 3876                           
REMARK   3                                                                      
REMARK   3  FIT TO DATA USED IN REFINEMENT.                                     
REMARK   3   CROSS-VALIDATION METHOD          : THROUGHOUT                      
REMARK   3   FREE R VALUE TEST SET SELECTION  : RANDOM                          
REMARK   3   R VALUE            (WORKING SET) : 0.242                           
REMARK   3   FREE R VALUE                     : 0.332                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : NULL                            
REMARK   3   FREE R VALUE TEST SET COUNT      : 396                             
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            : 605                                     
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 0                                       
REMARK   3   SOLVENT ATOMS            : 27                                      
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) : 0.00000                                              
REMARK   3    B22 (A**2) : 0.00000                                              
REMARK   3    B33 (A**2) : 0.00000                                              
REMARK   3    B12 (A**2) : 0.00000                                              
REMARK   3    B13 (A**2) : 0.00000                                              
REMARK   3    B23 (A**2) : 0.00000                                              
REMARK   3                                                                      
REMARK   3  ESTIMATED COORDINATE ERROR.                                         
REMARK   3   ESD FROM LUZZATI PLOT        (A) : NULL                            
REMARK   3   ESD FROM SIGMAA              (A) : NULL                            
REMARK   3   LOW RESOLUTION CUTOFF        (A) : NULL                            
REMARK   3                                                                      
REMARK   3  CROSS-VALIDATED ESTIMATED COORDINATE ERROR.                         
REMARK   3   ESD FROM C-V LUZZATI PLOT    (A) : NULL                            
REMARK   3   ESD FROM C-V SIGMAA          (A) : NULL                            
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.                                   
REMARK   3   BOND LENGTHS                 (A) : 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 : ANISOTROPIC                               
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 3CYO COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 07-MAY-08.                  
REMARK 100 THE DEPOSITION ID IS D_1000047374.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 01-NOV-07                          
REMARK 200  TEMPERATURE           (KELVIN) : 100.0                              
REMARK 200  PH                             : 7.50                               
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : N                                  
REMARK 200  RADIATION SOURCE               : ROTATING ANODE                     
REMARK 200  BEAMLINE                       : NULL                               
REMARK 200  X-RAY GENERATOR MODEL          : RIGAKU RU200                       
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 1.5418                             
REMARK 200  MONOCHROMATOR                  : GRAPHITE                           
REMARK 200  OPTICS                         : MIRRORS                            
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : IMAGE PLATE                        
REMARK 200  DETECTOR MANUFACTURER          : RIGAKU RAXIS IV                    
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : DENZO                              
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 4263                               
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.100                              
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     (%) : 98.7                               
REMARK 200  DATA REDUNDANCY                : NULL                               
REMARK 200  R MERGE                    (I) : NULL                               
REMARK 200  R SYM                      (I) : 0.09600                            
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 9.3000                             
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 2.10                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 2.18                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 88.3                               
REMARK 200  DATA REDUNDANCY IN SHELL       : NULL                               
REMARK 200  R MERGE FOR SHELL          (I) : 0.87900                            
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : NULL                               
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH                              
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: CNS                                                   
REMARK 200 STARTING MODEL: PDB ENTRY 1ENV                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 29.35                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 1.74                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: 25-40% ETHYLENE GLYCOL, 0.2 M MGCL2      
REMARK 280  AND 0.1 M HEPES PH 7.5, VAPOR DIFFUSION, SITTING DROP,              
REMARK 280  TEMPERATURE 295K, PH 7.50                                           
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 3                           
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   Z,X,Y                                                   
REMARK 290       6555   Z+1/2,-X+1/2,-Y                                         
REMARK 290       7555   -Z+1/2,-X,Y+1/2                                         
REMARK 290       8555   -Z,X+1/2,-Y+1/2                                         
REMARK 290       9555   Y,Z,X                                                   
REMARK 290      10555   -Y,Z+1/2,-X+1/2                                         
REMARK 290      11555   Y+1/2,-Z+1/2,-X                                         
REMARK 290      12555   -Y+1/2,-Z,X+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       29.64500            
REMARK 290   SMTRY2   2  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000  1.000000       29.64500            
REMARK 290   SMTRY1   3 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       29.64500            
REMARK 290   SMTRY3   3  0.000000  0.000000 -1.000000       29.64500            
REMARK 290   SMTRY1   4  1.000000  0.000000  0.000000       29.64500            
REMARK 290   SMTRY2   4  0.000000 -1.000000  0.000000       29.64500            
REMARK 290   SMTRY3   4  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   5  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY2   5  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   5  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY1   6  0.000000  0.000000  1.000000       29.64500            
REMARK 290   SMTRY2   6 -1.000000  0.000000  0.000000       29.64500            
REMARK 290   SMTRY3   6  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY1   7  0.000000  0.000000 -1.000000       29.64500            
REMARK 290   SMTRY2   7 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   7  0.000000  1.000000  0.000000       29.64500            
REMARK 290   SMTRY1   8  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY2   8  1.000000  0.000000  0.000000       29.64500            
REMARK 290   SMTRY3   8  0.000000 -1.000000  0.000000       29.64500            
REMARK 290   SMTRY1   9  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   9  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY3   9  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY1  10  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY2  10  0.000000  0.000000  1.000000       29.64500            
REMARK 290   SMTRY3  10 -1.000000  0.000000  0.000000       29.64500            
REMARK 290   SMTRY1  11  0.000000  1.000000  0.000000       29.64500            
REMARK 290   SMTRY2  11  0.000000  0.000000 -1.000000       29.64500            
REMARK 290   SMTRY3  11 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY1  12  0.000000 -1.000000  0.000000       29.64500            
REMARK 290   SMTRY2  12  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY3  12  1.000000  0.000000  0.000000       29.64500            
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: TRIMERIC                          
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TRIMERIC                   
REMARK 350 SOFTWARE USED: PISA                                                  
REMARK 350 TOTAL BURIED SURFACE AREA: 7410 ANGSTROM**2                          
REMARK 350 SURFACE AREA OF THE COMPLEX: 11280 ANGSTROM**2                       
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -63.7 KCAL/MOL                        
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A                                     
REMARK 350   BIOMT1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT3   1  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT1   2  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT2   2  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT3   2  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT1   3  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT2   3  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT3   3  1.000000  0.000000  0.000000        0.00000            
REMARK 375                                                                      
REMARK 375 SPECIAL POSITION                                                     
REMARK 375 THE FOLLOWING ATOMS ARE FOUND TO BE WITHIN 0.15 ANGSTROMS            
REMARK 375 OF A SYMMETRY RELATED ATOM AND ARE ASSUMED TO BE ON SPECIAL          
REMARK 375 POSITIONS.                                                           
REMARK 375                                                                      
REMARK 375 ATOM RES CSSEQI                                                      
REMARK 375      HOH A 101  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 102  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 103  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH A 104  LIES ON A SPECIAL POSITION.                          
REMARK 465                                                                      
REMARK 465 MISSING RESIDUES                                                     
REMARK 465 THE FOLLOWING RESIDUES WERE NOT LOCATED IN THE                       
REMARK 465 EXPERIMENT. (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN               
REMARK 465 IDENTIFIER; SSSEQ=SEQUENCE NUMBER; I=INSERTION CODE.)                
REMARK 465                                                                      
REMARK 465   M RES C SSSEQI                                                     
REMARK 465     THR A     1                                                      
REMARK 465     LEU A     2                                                      
REMARK 465     GLN A    42                                                      
REMARK 465     ALA A    43                                                      
REMARK 465     ARG A    44                                                      
REMARK 465     SER A    45                                                      
REMARK 465     GLY A    46                                                      
REMARK 465     GLY A    47                                                      
REMARK 465     ARG A    48                                                      
REMARK 465     GLY A    49                                                      
REMARK 465     GLY A    50                                                      
REMARK 465     TRP A    51                                                      
REMARK 465     LEU A    86                                                      
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     THR A   3    OG1                                                 
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 3CP1   RELATED DB: PDB                                   
REMARK 900 STRUCTURE OF A LONGER THERMALSTABLE CORE DOMAIN OF HIV-1 GP41        
REMARK 900 CONTAINING THE ENFUVIRTIDE RESISTANCE MUTATION N43D                  
DBREF  3CYO A    1    44  UNP    Q70626   ENV_HV1LW      536    579             
DBREF  3CYO A   51    86  UNP    Q70626   ENV_HV1LW      628    663             
SEQADV 3CYO ASP A   19  UNP  Q70626    ASN   554 ENGINEERED MUTATION            
SEQADV 3CYO SER A   45  UNP  Q70626              LINKER                         
SEQADV 3CYO GLY A   46  UNP  Q70626              LINKER                         
SEQADV 3CYO GLY A   47  UNP  Q70626              LINKER                         
SEQADV 3CYO ARG A   48  UNP  Q70626              LINKER                         
SEQADV 3CYO GLY A   49  UNP  Q70626              LINKER                         
SEQADV 3CYO GLY A   50  UNP  Q70626              LINKER                         
SEQADV 3CYO LYS A   71  UNP  Q70626    GLU   648 ENGINEERED MUTATION            
SEQRES   1 A   86  THR LEU THR VAL GLN ALA ARG GLN LEU LEU SER GLY ILE          
SEQRES   2 A   86  VAL GLN GLN GLN ASN ASP LEU LEU ARG ALA ILE GLU ALA          
SEQRES   3 A   86  GLN GLN HIS LEU LEU GLN LEU THR VAL TRP GLY ILE LYS          
SEQRES   4 A   86  GLN LEU GLN ALA ARG SER GLY GLY ARG GLY GLY TRP MET          
SEQRES   5 A   86  GLU TRP ASP ARG GLU ILE ASN ASN TYR THR SER LEU ILE          
SEQRES   6 A   86  HIS SER LEU ILE GLU LYS SER GLN ASN GLN GLN GLU LYS          
SEQRES   7 A   86  ASN GLU GLN GLU LEU LEU GLU LEU                              
FORMUL   2  HOH   *27(H2 O)                                                     
HELIX    1   1 THR A    3  LEU A   41  1                                  39    
HELIX    2   2 GLU A   53  LEU A   84  1                                  32    
CRYST1   59.290   59.290   59.290  90.00  90.00  90.00 P 21 3       12          
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      0.016866  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.016866  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.016866        0.00000