HEADER PROTON TRANSPORT 08-NOV-06 2NTW TITLE BACTERIORHODOPSIN, WILD TYPE, AFTER ILLUMINATION TO PRODUCE THE L TITLE 2 INTERMEDIATE COMPND MOL_ID: 1; COMPND 2 MOLECULE: BACTERIORHODOPSIN; COMPND 3 CHAIN: A; COMPND 4 SYNONYM: BR; COMPND 5 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: HALOBACTERIUM SALINARUM; SOURCE 3 ORGANISM_TAXID: 2242; SOURCE 4 CELLULAR_LOCATION: PLASMA MEMBRANE; SOURCE 5 GENE: BOP; SOURCE 6 EXPRESSION_SYSTEM: HALOBACTERIUM SALINARUM; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 2242; SOURCE 8 EXPRESSION_SYSTEM_STRAIN: MPK409; SOURCE 9 EXPRESSION_SYSTEM_CELLULAR_LOCATION: CYTOPLASM; SOURCE 10 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 11 EXPRESSION_SYSTEM_PLASMID: PBA2 KEYWDS ION PUMP, MEMBRANE PROTEIN, RETINAL PROTEIN, LIPIDS, PHOTORECEPTOR, KEYWDS 2 HALOARCHAEA, 7-TRANSMEMBRANE, SERPENTINE, ION TRANSPORT, KEYWDS 3 PHOTOINTERMEDIATE, PROTON TRANSPORT EXPDTA X-RAY DIFFRACTION NUMMDL 2 AUTHOR J.K.LANYI,B.SCHOBERT REVDAT 5 30-AUG-23 2NTW 1 REMARK LINK REVDAT 4 13-JUL-11 2NTW 1 VERSN REVDAT 3 24-FEB-09 2NTW 1 VERSN REVDAT 2 23-JAN-07 2NTW 1 JRNL REVDAT 1 26-DEC-06 2NTW 0 JRNL AUTH J.K.LANYI,B.SCHOBERT JRNL TITL STRUCTURAL CHANGES IN THE L PHOTOINTERMEDIATE OF JRNL TITL 2 BACTERIORHODOPSIN. JRNL REF J.MOL.BIOL. V. 365 1379 2007 JRNL REFN ISSN 0022-2836 JRNL PMID 17141271 JRNL DOI 10.1016/J.JMB.2006.11.016 REMARK 2 REMARK 2 RESOLUTION. 1.53 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : SHELXL-97 REMARK 3 AUTHORS : G.M.SHELDRICK REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.53 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 25.00 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 COMPLETENESS FOR RANGE (%) : 96.9 REMARK 3 CROSS-VALIDATION METHOD : FREE R REMARK 3 FREE R VALUE TEST SET SELECTION : RANDOM REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT (NO CUTOFF). REMARK 3 R VALUE (WORKING + TEST SET, NO CUTOFF) : 0.153 REMARK 3 R VALUE (WORKING SET, NO CUTOFF) : 0.153 REMARK 3 FREE R VALUE (NO CUTOFF) : 0.195 REMARK 3 FREE R VALUE TEST SET SIZE (%, NO CUTOFF) : 5.000 REMARK 3 FREE R VALUE TEST SET COUNT (NO CUTOFF) : 1845 REMARK 3 TOTAL NUMBER OF REFLECTIONS (NO CUTOFF) : 34929 REMARK 3 REMARK 3 FIT/AGREEMENT OF MODEL FOR DATA WITH F>4SIG(F). REMARK 3 R VALUE (WORKING + TEST SET, F>4SIG(F)) : 0.143 REMARK 3 R VALUE (WORKING SET, F>4SIG(F)) : 0.142 REMARK 3 FREE R VALUE (F>4SIG(F)) : 0.185 REMARK 3 FREE R VALUE TEST SET SIZE (%, F>4SIG(F)) : 5.000 REMARK 3 FREE R VALUE TEST SET COUNT (F>4SIG(F)) : 1425 REMARK 3 TOTAL NUMBER OF REFLECTIONS (F>4SIG(F)) : 27982 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 1720 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 20 REMARK 3 SOLVENT ATOMS : 23 REMARK 3 REMARK 3 MODEL REFINEMENT. REMARK 3 OCCUPANCY SUM OF NON-HYDROGEN ATOMS : 1763.0 REMARK 3 OCCUPANCY SUM OF HYDROGEN ATOMS : NULL REMARK 3 NUMBER OF DISCRETELY DISORDERED RESIDUES : 246 REMARK 3 NUMBER OF LEAST-SQUARES PARAMETERS : 7056 REMARK 3 NUMBER OF RESTRAINTS : 20914 REMARK 3 REMARK 3 RMS DEVIATIONS FROM RESTRAINT TARGET VALUES. REMARK 3 BOND LENGTHS (A) : 0.011 REMARK 3 ANGLE DISTANCES (A) : 0.026 REMARK 3 SIMILAR DISTANCES (NO TARGET VALUES) (A) : NULL REMARK 3 DISTANCES FROM RESTRAINT PLANES (A) : 0.023 REMARK 3 ZERO CHIRAL VOLUMES (A**3) : 0.037 REMARK 3 NON-ZERO CHIRAL VOLUMES (A**3) : 0.039 REMARK 3 ANTI-BUMPING DISTANCE RESTRAINTS (A) : 0.588 REMARK 3 RIGID-BOND ADP COMPONENTS (A**2) : NULL REMARK 3 SIMILAR ADP COMPONENTS (A**2) : 0.061 REMARK 3 APPROXIMATELY ISOTROPIC ADPS (A**2) : NULL REMARK 3 REMARK 3 BULK SOLVENT MODELING. REMARK 3 METHOD USED: NULL REMARK 3 REMARK 3 STEREOCHEMISTRY TARGET VALUES : ENGH AND HUBER REMARK 3 SPECIAL CASE: NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: MODEL REFINED AS TWO CONFORMATIONS, "A" REMARK 3 THE L STATE, "B" WITH 40% OCCUPANCY IS THE BR STATE. REMARK 3 CONFORMATION BEFORE ILLUMINATION (PDB ENTRY 2NTU) REMARK 4 REMARK 4 2NTW COMPLIES WITH FORMAT V. 3.15, 01-DEC-08 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 09-NOV-06. REMARK 100 THE DEPOSITION ID IS D_1000040296. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 14-APR-06 REMARK 200 TEMPERATURE (KELVIN) : 100.0 REMARK 200 PH : 5.6 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : SSRL REMARK 200 BEAMLINE : BL11-1 REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 0.97977 REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : ADSC QUANTUM REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : HKL-2000 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 33922 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.530 REMARK 200 RESOLUTION RANGE LOW (A) : 25.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 2.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 96.9 REMARK 200 DATA REDUNDANCY : NULL REMARK 200 R MERGE (I) : 0.02900 REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : 42.4000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.53 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.59 REMARK 200 COMPLETENESS FOR SHELL (%) : 86.5 REMARK 200 DATA REDUNDANCY IN SHELL : NULL REMARK 200 R MERGE FOR SHELL (I) : 0.57700 REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 FOR SHELL : 2.100 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT REMARK 200 SOFTWARE USED: SHELX REMARK 200 STARTING MODEL: PDB ENTRY 1C3W REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 44.05 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.20 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: MO:WATER:PHOSPHATE, PH 5.6, CUBIC REMARK 280 LIPID PHASE, TEMPERATURE 295K REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 63 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -Y,X-Y,Z REMARK 290 3555 -X+Y,-X,Z REMARK 290 4555 -X,-Y,Z+1/2 REMARK 290 5555 Y,-X+Y,Z+1/2 REMARK 290 6555 X-Y,X,Z+1/2 REMARK 290 REMARK 290 WHERE NNN -> OPERATOR NUMBER REMARK 290 MMM -> TRANSLATION VECTOR REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS REMARK 290 THE FOLLOWING TRANSFORMATIONS OPERATE ON THE ATOM/HETATM REMARK 290 RECORDS IN THIS ENTRY TO PRODUCE CRYSTALLOGRAPHICALLY REMARK 290 RELATED MOLECULES. REMARK 290 SMTRY1 1 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 1 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 1 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 2 -0.500000 -0.866025 0.000000 0.00000 REMARK 290 SMTRY2 2 0.866025 -0.500000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 3 -0.500000 0.866025 0.000000 0.00000 REMARK 290 SMTRY2 3 -0.866025 -0.500000 0.000000 0.00000 REMARK 290 SMTRY3 3 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 4 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 4 0.000000 0.000000 1.000000 55.19400 REMARK 290 SMTRY1 5 0.500000 0.866025 0.000000 0.00000 REMARK 290 SMTRY2 5 -0.866025 0.500000 0.000000 0.00000 REMARK 290 SMTRY3 5 0.000000 0.000000 1.000000 55.19400 REMARK 290 SMTRY1 6 0.500000 -0.866025 0.000000 0.00000 REMARK 290 SMTRY2 6 0.866025 0.500000 0.000000 0.00000 REMARK 290 SMTRY3 6 0.000000 0.000000 1.000000 55.19400 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,PQS REMARK 350 TOTAL BURIED SURFACE AREA: 6390 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 25580 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -51.0 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 -0.500000 -0.866025 0.000000 30.48300 REMARK 350 BIOMT2 2 0.866025 -0.500000 0.000000 52.79810 REMARK 350 BIOMT3 2 0.000000 0.000000 1.000000 0.00000 REMARK 350 BIOMT1 3 -0.500000 0.866025 0.000000 -30.48300 REMARK 350 BIOMT2 3 -0.866025 -0.500000 0.000000 52.79810 REMARK 350 BIOMT3 3 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 1 GLN A 1 REMARK 465 1 ALA A 2 REMARK 465 1 GLN A 3 REMARK 465 1 ILE A 4 REMARK 465 1 THR A 157 REMARK 465 1 SER A 158 REMARK 465 1 LYS A 159 REMARK 465 1 ALA A 160 REMARK 465 1 GLU A 161 REMARK 465 1 GLU A 232 REMARK 465 1 ALA A 233 REMARK 465 1 GLU A 234 REMARK 465 1 ALA A 235 REMARK 465 1 PRO A 236 REMARK 465 1 GLU A 237 REMARK 465 1 PRO A 238 REMARK 465 1 SER A 239 REMARK 465 1 ALA A 240 REMARK 465 1 GLY A 241 REMARK 465 1 ASP A 242 REMARK 465 1 GLY A 243 REMARK 465 1 ALA A 244 REMARK 465 1 ALA A 245 REMARK 465 1 ALA A 246 REMARK 465 1 THR A 247 REMARK 465 1 SER A 248 REMARK 465 1 ASP A 249 REMARK 465 2 GLN A 1 REMARK 465 2 ALA A 2 REMARK 465 2 GLN A 3 REMARK 465 2 ILE A 4 REMARK 465 2 THR A 157 REMARK 465 2 SER A 158 REMARK 465 2 LYS A 159 REMARK 465 2 ALA A 160 REMARK 465 2 GLU A 161 REMARK 465 2 GLU A 232 REMARK 465 2 ALA A 233 REMARK 465 2 GLU A 234 REMARK 465 2 ALA A 235 REMARK 465 2 PRO A 236 REMARK 465 2 GLU A 237 REMARK 465 2 PRO A 238 REMARK 465 2 SER A 239 REMARK 465 2 ALA A 240 REMARK 465 2 GLY A 241 REMARK 465 2 ASP A 242 REMARK 465 2 GLY A 243 REMARK 465 2 ALA A 244 REMARK 465 2 ALA A 245 REMARK 465 2 ALA A 246 REMARK 465 2 THR A 247 REMARK 465 2 SER A 248 REMARK 465 2 ASP A 249 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 1 ARG A 82 CD - NE - CZ ANGL. DEV. = -9.3 DEGREES REMARK 500 1 ARG A 82 NE - CZ - NH1 ANGL. DEV. = -3.9 DEGREES REMARK 500 2 ARG A 7 NE - CZ - NH1 ANGL. DEV. = 4.5 DEGREES REMARK 500 2 ALA A 18 O - C - N ANGL. DEV. = -9.8 DEGREES REMARK 500 2 TYR A 57 CZ - CE2 - CD2 ANGL. DEV. = -5.9 DEGREES REMARK 500 2 ARG A 82 CD - NE - CZ ANGL. DEV. = -10.7 DEGREES REMARK 500 2 ARG A 82 NH1 - CZ - NH2 ANGL. DEV. = 7.0 DEGREES REMARK 500 2 ARG A 82 NE - CZ - NH1 ANGL. DEV. = -5.1 DEGREES REMARK 500 2 TYR A 83 CB - CG - CD1 ANGL. DEV. = -4.1 DEGREES REMARK 500 2 TYR A 133 CB - CG - CD2 ANGL. DEV. = -3.9 DEGREES REMARK 500 2 PHE A 135 CB - CG - CD1 ANGL. DEV. = -5.2 DEGREES REMARK 500 2 ARG A 175 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 2 ARG A 175 NE - CZ - NH2 ANGL. DEV. = -3.2 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 1 LYS A 216 -65.84 -102.29 REMARK 500 REMARK 500 REMARK: NULL REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE RET A 301 REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 1O0A RELATED DB: PDB REMARK 900 EARLIER ATTEMPT TO DETERMINE THE STRUCTURE OF THE L INTERMEDIATE OF REMARK 900 BACTERIORHODOPSIN REMARK 900 RELATED ID: 2NTU RELATED DB: PDB DBREF 2NTW A 1 249 UNP P02945 BACR_HALSA 14 262 SEQRES 1 A 249 GLN ALA GLN ILE THR GLY ARG PRO GLU TRP ILE TRP LEU SEQRES 2 A 249 ALA LEU GLY THR ALA LEU MET GLY LEU GLY THR LEU TYR SEQRES 3 A 249 PHE LEU VAL LYS GLY MET GLY VAL SER ASP PRO ASP ALA SEQRES 4 A 249 LYS LYS PHE TYR ALA ILE THR THR LEU VAL PRO ALA ILE SEQRES 5 A 249 ALA PHE THR MET TYR LEU SER MET LEU LEU GLY TYR GLY SEQRES 6 A 249 LEU THR MET VAL PRO PHE GLY GLY GLU GLN ASN PRO ILE SEQRES 7 A 249 TYR TRP ALA ARG TYR ALA ASP TRP LEU PHE THR THR PRO SEQRES 8 A 249 LEU LEU LEU LEU ASP LEU ALA LEU LEU VAL ASP ALA ASP SEQRES 9 A 249 GLN GLY THR ILE LEU ALA LEU VAL GLY ALA ASP GLY ILE SEQRES 10 A 249 MET ILE GLY THR GLY LEU VAL GLY ALA LEU THR LYS VAL SEQRES 11 A 249 TYR SER TYR ARG PHE VAL TRP TRP ALA ILE SER THR ALA SEQRES 12 A 249 ALA MET LEU TYR ILE LEU TYR VAL LEU PHE PHE GLY PHE SEQRES 13 A 249 THR SER LYS ALA GLU SER MET ARG PRO GLU VAL ALA SER SEQRES 14 A 249 THR PHE LYS VAL LEU ARG ASN VAL THR VAL VAL LEU TRP SEQRES 15 A 249 SER ALA TYR PRO VAL VAL TRP LEU ILE GLY SER GLU GLY SEQRES 16 A 249 ALA GLY ILE VAL PRO LEU ASN ILE GLU THR LEU LEU PHE SEQRES 17 A 249 MET VAL LEU ASP VAL SER ALA LYS VAL GLY PHE GLY LEU SEQRES 18 A 249 ILE LEU LEU ARG SER ARG ALA ILE PHE GLY GLU ALA GLU SEQRES 19 A 249 ALA PRO GLU PRO SER ALA GLY ASP GLY ALA ALA ALA THR SEQRES 20 A 249 SER ASP HET RET A 301 20 HETNAM RET RETINAL FORMUL 2 RET C20 H28 O FORMUL 3 HOH *23(H2 O) HELIX 1 1 GLU A 9 GLY A 31 1 23 HELIX 2 2 ASP A 36 LEU A 62 1 27 HELIX 3 3 TRP A 80 VAL A 101 1 22 HELIX 4 4 ASP A 104 THR A 128 1 25 HELIX 5 5 VAL A 130 GLY A 155 1 26 HELIX 6 6 ARG A 164 GLY A 192 1 29 HELIX 7 7 PRO A 200 SER A 226 1 27 HELIX 8 8 ARG A 227 PHE A 230 5 4 SHEET 1 A 2 THR A 67 PHE A 71 0 SHEET 2 A 2 GLU A 74 ILE A 78 -1 O ILE A 78 N THR A 67 LINK NZ ALYS A 216 C15ARET A 301 1555 1555 1.32 SITE 1 AC1 11 TRP A 86 THR A 89 THR A 90 TRP A 138 SITE 2 AC1 11 SER A 141 THR A 142 TRP A 182 TYR A 185 SITE 3 AC1 11 TRP A 189 ASP A 212 LYS A 216 CRYST1 60.966 60.966 110.388 90.00 90.00 120.00 P 63 6 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 0.016403 0.009470 0.000000 0.00000 SCALE2 0.000000 0.018940 0.000000 0.00000 SCALE3 0.000000 0.000000 0.009059 0.00000 MODEL 1