PDB Short entry for 1F27
HEADER    RNA                                     23-MAY-00   1F27              
TITLE     CRYSTAL STRUCTURE OF A BIOTIN-BINDING RNA PSEUDOKNOT                  
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: RNA (5'-                                                   
COMPND   3 R(*AP*CP*CP*GP*UP*CP*AP*GP*AP*GP*GP*AP*CP*AP*CP*GP*GP*UP*U)-3');     
COMPND   4 CHAIN: A;                                                            
COMPND   5 ENGINEERED: YES;                                                     
COMPND   6 OTHER_DETAILS: RNA BIOTIN-BINDING APTAMER;                           
COMPND   7 MOL_ID: 2;                                                           
COMPND   8 MOLECULE: RNA (5'-R(*AP*AP*AP*AP*AP*GP*UP*CP*CP*UP*C)-3');           
COMPND   9 CHAIN: B;                                                            
COMPND  10 ENGINEERED: YES;                                                     
COMPND  11 OTHER_DETAILS: RNA BIOTIN-BINDING APTAMER                            
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 SYNTHETIC: YES;                                                      
SOURCE   3 OTHER_DETAILS: SEQUENCE FROM IN VITRO SELECTION EXPERIMENT;          
SOURCE   4 MOL_ID: 2;                                                           
SOURCE   5 SYNTHETIC: YES                                                       
KEYWDS    RNA APTAMER, PSEUDOKNOT, BIOTIN-BINDING RNA, RNA                      
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    J.NIX,D.SUSSMAN,C.WILSON                                              
REVDAT   4   07-FEB-24 1F27    1       REMARK LINK                              
REVDAT   3   24-FEB-09 1F27    1       VERSN                                    
REVDAT   2   01-APR-03 1F27    1       JRNL                                     
REVDAT   1   12-JUN-00 1F27    0                                                
JRNL        AUTH   J.NIX,D.SUSSMAN,C.WILSON                                     
JRNL        TITL   THE 1.3 A CRYSTAL STRUCTURE OF A BIOTIN-BINDING PSEUDOKNOT   
JRNL        TITL 2 AND THE BASIS FOR RNA MOLECULAR RECOGNITION.                 
JRNL        REF    J.MOL.BIOL.                   V. 296  1235 2000              
JRNL        REFN                   ISSN 0022-2836                               
JRNL        PMID   10698630                                                     
JRNL        DOI    10.1006/JMBI.2000.3539                                       
REMARK   2                                                                      
REMARK   2 RESOLUTION.    1.30 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 : NULL                                            
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 1.30                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 17.18                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 2.000                          
REMARK   3   DATA CUTOFF HIGH         (ABS(F)) : NULL                           
REMARK   3   DATA CUTOFF LOW          (ABS(F)) : NULL                           
REMARK   3   COMPLETENESS (WORKING+TEST)   (%) : 91.7                           
REMARK   3   NUMBER OF REFLECTIONS             : 20852                          
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) : 0.199                           
REMARK   3   FREE R VALUE                     : 0.238                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 8.600                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 1797                            
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            : 0                                       
REMARK   3   NUCLEIC ACID ATOMS       : 634                                     
REMARK   3   HETEROGEN ATOMS          : 22                                      
REMARK   3   SOLVENT ATOMS            : 184                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : 12.20                          
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 1F27 COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 25-MAY-00.                  
REMARK 100 THE DEPOSITION ID IS D_1000011153.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 20-SEP-98; 21-MAR-99               
REMARK 200  TEMPERATURE           (KELVIN) : 100; NULL                          
REMARK 200  PH                             : 7.4                                
REMARK 200  NUMBER OF CRYSTALS USED        : 2                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : Y; Y                               
REMARK 200  RADIATION SOURCE               : ALS; ALS                           
REMARK 200  BEAMLINE                       : 5.0.2; 5.0.2                       
REMARK 200  X-RAY GENERATOR MODEL          : NULL; NULL                         
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M; M                               
REMARK 200  WAVELENGTH OR RANGE        (A) : 0.97186, 0.97954, 0.97969,         
REMARK 200                                   0.98743; 0.9650                    
REMARK 200  MONOCHROMATOR                  : NULL; NULL                         
REMARK 200  OPTICS                         : NULL; NULL                         
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : CCD; CCD                           
REMARK 200  DETECTOR MANUFACTURER          : ADSC QUANTUM 4; ADSC QUANTUM 4     
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : DENZO                              
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : NULL                               
REMARK 200  RESOLUTION RANGE HIGH      (A) : 1.300                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 18.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : 1.000                              
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 92.0                               
REMARK 200  DATA REDUNDANCY                : 6.300                              
REMARK 200  R MERGE                    (I) : 0.04800                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 9.0000                             
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.30                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 1.38                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 66.4                               
REMARK 200  DATA REDUNDANCY IN SHELL       : NULL                               
REMARK 200  R MERGE FOR SHELL          (I) : 0.38000                            
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : NULL                               
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH; SINGLE WAVELENGTH           
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: NULL                         
REMARK 200 SOFTWARE USED: SHARP                                                 
REMARK 200 STARTING MODEL: NULL                                                 
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 44.43                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.21                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: MPD, POTASIUM HEPES, MGCL2, KCL,         
REMARK 280  BIOTIN, SPERMINE, PH 7.4, VAPOR DIFFUSION, HANGING DROP,            
REMARK 280  TEMPERATURE 301K                                                    
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: C 1 2 1                          
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X,Y,-Z                                                 
REMARK 290       3555   X+1/2,Y+1/2,Z                                           
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        0.00000            
REMARK 290   SMTRY2   2  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   3  1.000000  0.000000  0.000000       23.79500            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       15.48000            
REMARK 290   SMTRY3   3  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   4 -1.000000  0.000000  0.000000       23.79500            
REMARK 290   SMTRY2   4  0.000000  1.000000  0.000000       15.48000            
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 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 197  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       A A   3    O5'                                                 
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: PLANAR GROUPS                                              
REMARK 500                                                                      
REMARK 500 PLANAR GROUPS IN THE FOLLOWING RESIDUES HAVE A TOTAL                 
REMARK 500 RMS DISTANCE OF ALL ATOMS FROM THE BEST-FIT PLANE                    
REMARK 500 BY MORE THAN AN EXPECTED VALUE OF 6*RMSD, WITH AN                    
REMARK 500 RMSD 0.02 ANGSTROMS, OR AT LEAST ONE ATOM HAS                        
REMARK 500 AN RMSD GREATER THAN THIS VALUE                                      
REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER;               
REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE).                             
REMARK 500                                                                      
REMARK 500  M RES CSSEQI        RMS     TYPE                                    
REMARK 500      U A   7         0.09    SIDE CHAIN                              
REMARK 500      U B  31         0.07    SIDE CHAIN                              
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 620                                                                      
REMARK 620 METAL COORDINATION                                                   
REMARK 620 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER;               
REMARK 620 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE):                             
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A  35  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1   U A   7   O4                                                     
REMARK 620 2 HOH A 162   O    82.9                                              
REMARK 620 3 HOH A 164   O   100.3  87.2                                        
REMARK 620 4 HOH A 173   O    84.2  80.9 166.7                                  
REMARK 620 N                    1     2     3                                   
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A  37  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1   C A   8   OP2                                                    
REMARK 620 2 HOH A 105   O    87.0                                              
REMARK 620 3 HOH A 170   O    91.0  88.4                                        
REMARK 620 4 HOH A 172   O    93.1  85.7 172.6                                  
REMARK 620 5 HOH A 202   O   177.4  94.0  86.7  89.4                            
REMARK 620 6 HOH A 203   O    97.5 174.3  95.0  90.6  81.6                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A  36  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1   A A   9   OP2                                                    
REMARK 620 2 HOH A  65   O   171.5                                              
REMARK 620 3 HOH A 165   O    87.2  89.4                                        
REMARK 620 4 HOH A 166   O    98.3  89.3  88.7                                  
REMARK 620 5 HOH A 167   O    86.7  85.7  93.0 174.7                            
REMARK 620 6 HOH A 168   O    94.1  89.5 178.6  90.6  87.6                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG B  38  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 BTN A  33   O3                                                     
REMARK 620 2 HOH A 159   O    87.0                                              
REMARK 620 3 HOH A 160   O    84.8 171.8                                        
REMARK 620 4   A B  25   OP2 179.0  93.0  95.2                                  
REMARK 620 5 HOH B 158   O    90.5  91.3  88.3  88.4                            
REMARK 620 6 HOH B 161   O    88.1  88.6  91.5  92.9 178.6                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A  34  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1  MG A  39  MG                                                      
REMARK 620 2 HOH A  43   O    47.2                                              
REMARK 620 3 HOH A 163   O   137.2  93.0                                        
REMARK 620 4 HOH A 169   O    44.5  80.7 163.1                                  
REMARK 620 5 HOH A 171   O    75.1  84.6  87.9 107.0                            
REMARK 620 6 HOH A 199   O    42.3  83.5 137.8  57.5  49.9                      
REMARK 620 7 HOH A 200   O   107.0  91.7  85.9  78.6 172.6 136.1                
REMARK 620 8 HOH A 201   O   124.8 171.4  93.6  94.4  90.1  87.9  94.3          
REMARK 620 N                    1     2     3     4     5     6     7           
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A  39  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 HOH A  43   O                                                      
REMARK 620 2 HOH A 169   O    86.7                                              
REMARK 620 3 HOH A 171   O    63.9  81.1                                        
REMARK 620 4 HOH A 197   O    95.2 171.6  92.4                                  
REMARK 620 5 HOH A 197   O    95.6 171.8  92.8   0.5                            
REMARK 620 6 HOH A 198   O    92.4 101.2 156.1  86.9  86.5                      
REMARK 620 7 HOH A 198   O   174.9  94.1 111.3  83.2  82.9  92.3                
REMARK 620 8 HOH A 199   O    99.2  68.8  37.8 102.8 103.1 164.1  76.5          
REMARK 620 N                    1     2     3     4     5     6     7           
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 34                   
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC2                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 35                   
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC3                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 36                   
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC4                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 37                   
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC5                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG B 38                   
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC6                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 39                   
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC7                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE BTN A 33                  
DBREF  1F27 A    3    21  PDB    1F27     1F27             3     21             
DBREF  1F27 B   22    32  PDB    1F27     1F27            22     32             
SEQRES   1 A   19    A   C   C   G   U   C   A   G   A   G   G   A   C          
SEQRES   2 A   19    A   C   G   G   U   U                                      
SEQRES   1 B   11    A   A   A   A   A   G   U   C   C   U   C                  
HET     MG  A  34       1                                                       
HET     MG  A  35       1                                                       
HET     MG  A  36       1                                                       
HET     MG  A  37       1                                                       
HET     MG  A  39       1                                                       
HET    BTN  A  33      16                                                       
HET     MG  B  38       1                                                       
HETNAM      MG MAGNESIUM ION                                                    
HETNAM     BTN BIOTIN                                                           
FORMUL   3   MG    6(MG 2+)                                                     
FORMUL   8  BTN    C10 H16 N2 O3 S                                              
FORMUL  10  HOH   *184(H2 O)                                                    
LINK         O4    U A   7                MG    MG A  35     1555   1555  2.31  
LINK         OP2   C A   8                MG    MG A  37     1555   1555  1.92  
LINK         OP2   A A   9                MG    MG A  36     1555   1555  2.01  
LINK         O3  BTN A  33                MG    MG B  38     1555   1555  2.06  
LINK        MG    MG A  34                MG    MG A  39     1555   2655  2.88  
LINK        MG    MG A  34                 O   HOH A  43     1555   1555  2.21  
LINK        MG    MG A  34                 O   HOH A 163     1555   1555  2.09  
LINK        MG    MG A  34                 O   HOH A 169     1555   2655  2.19  
LINK        MG    MG A  34                 O   HOH A 171     1555   1555  2.04  
LINK        MG    MG A  34                 O   HOH A 199     1555   1555  2.46  
LINK        MG    MG A  34                 O   HOH A 200     1555   1555  1.99  
LINK        MG    MG A  34                 O   HOH A 201     1555   1555  2.04  
LINK        MG    MG A  35                 O   HOH A 162     1555   1555  2.09  
LINK        MG    MG A  35                 O   HOH A 164     1555   1555  2.04  
LINK        MG    MG A  35                 O   HOH A 173     1555   1555  2.08  
LINK        MG    MG A  36                 O   HOH A  65     1555   1555  2.16  
LINK        MG    MG A  36                 O   HOH A 165     1555   1555  2.03  
LINK        MG    MG A  36                 O   HOH A 166     1555   1555  2.16  
LINK        MG    MG A  36                 O   HOH A 167     1555   1555  2.12  
LINK        MG    MG A  36                 O   HOH A 168     1555   1555  2.06  
LINK        MG    MG A  37                 O   HOH A 105     1555   1555  2.30  
LINK        MG    MG A  37                 O   HOH A 170     1555   1555  2.24  
LINK        MG    MG A  37                 O   HOH A 172     1555   1555  2.07  
LINK        MG    MG A  37                 O   HOH A 202     1555   1555  1.97  
LINK        MG    MG A  37                 O   HOH A 203     1555   1555  1.97  
LINK        MG    MG A  39                 O   HOH A  43     1555   2655  2.13  
LINK        MG    MG A  39                 O   HOH A 169     1555   1555  2.02  
LINK        MG    MG A  39                 O   HOH A 171     1555   2655  3.07  
LINK        MG    MG A  39                 O   HOH A 197     1555   1555  2.24  
LINK        MG    MG A  39                 O   HOH A 197     1555   2655  2.25  
LINK        MG    MG A  39                 O   HOH A 198     1555   1555  1.96  
LINK        MG    MG A  39                 O   HOH A 198     1555   2655  2.11  
LINK        MG    MG A  39                 O   HOH A 199     1555   2655  1.96  
LINK         O   HOH A 159                MG    MG B  38     1555   1555  2.10  
LINK         O   HOH A 160                MG    MG B  38     1555   1555  2.05  
LINK         OP2   A B  25                MG    MG B  38     1555   1555  1.99  
LINK        MG    MG B  38                 O   HOH B 158     1555   1555  2.03  
LINK        MG    MG B  38                 O   HOH B 161     1555   1555  2.08  
SITE     1 AC1  8  MG A  39  HOH A  43  HOH A 163  HOH A 169                    
SITE     2 AC1  8 HOH A 171  HOH A 199  HOH A 200  HOH A 201                    
SITE     1 AC2  4   U A   7  HOH A 162  HOH A 164  HOH A 173                    
SITE     1 AC3  6   A A   9  HOH A  65  HOH A 165  HOH A 166                    
SITE     2 AC3  6 HOH A 167  HOH A 168                                          
SITE     1 AC4  6   C A   8  HOH A 105  HOH A 170  HOH A 172                    
SITE     2 AC4  6 HOH A 202  HOH A 203                                          
SITE     1 AC5  6 BTN A  33  HOH A 159  HOH A 160    A B  25                    
SITE     2 AC5  6 HOH B 158  HOH B 161                                          
SITE     1 AC6  7  MG A  34  HOH A  43  HOH A 169  HOH A 171                    
SITE     2 AC6  7 HOH A 197  HOH A 198  HOH A 199                               
SITE     1 AC7 10   G A   6    U A   7  HOH A 159  HOH A 160                    
SITE     2 AC7 10   A B  26    G B  27   MG B  38  HOH B  53                    
SITE     3 AC7 10 HOH B 158  HOH B 161                                          
CRYST1   47.590   30.960   62.110  90.00 111.88  90.00 C 1 2 1       4          
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      0.021013  0.000000  0.008439        0.00000                         
SCALE2      0.000000  0.032300  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.017350        0.00000