HEADER PHOTORECEPTOR 23-MAY-90 1BRD TITLE MODEL FOR THE STRUCTURE OF BACTERIORHODOPSIN BASED ON HIGH-RESOLUTION TITLE 2 ELECTRON CRYO-MICROSCOPY COMPND MOL_ID: 1; COMPND 2 MOLECULE: BACTERIORHODOPSIN PRECURSOR; COMPND 3 CHAIN: A; COMPND 4 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: HALOBACTERIUM SALINARUM; SOURCE 3 ORGANISM_TAXID: 2242 KEYWDS PHOTORECEPTOR EXPDTA ELECTRON CRYSTALLOGRAPHY AUTHOR R.HENDERSON,J.M.BALDWIN,T.A.CESKA,F.ZEMLIN,E.BECKMANN,K.H.DOWNING REVDAT 8 30-OCT-24 1BRD 1 REMARK REVDAT 7 17-APR-24 1BRD 1 REMARK REVDAT 6 26-JUL-23 1BRD 1 REMARK SEQRES LINK SCALE REVDAT 6 2 1 ATOM REVDAT 5 19-MAY-10 1BRD 1 REMARK REVDAT 4 24-FEB-09 1BRD 1 VERSN REVDAT 3 15-JAN-93 1BRD 1 SEQRES REVDAT 2 15-JUL-91 1BRD 1 REMARK REVDAT 1 15-APR-91 1BRD 0 JRNL AUTH R.HENDERSON,J.M.BALDWIN,T.A.CESKA,F.ZEMLIN,E.BECKMANN, JRNL AUTH 2 K.H.DOWNING JRNL TITL MODEL FOR THE STRUCTURE OF BACTERIORHODOPSIN BASED ON JRNL TITL 2 HIGH-RESOLUTION ELECTRON CRYO-MICROSCOPY. JRNL REF J.MOL.BIOL. V. 213 899 1990 JRNL REFN ISSN 0022-2836 JRNL PMID 2359127 JRNL DOI 10.1016/S0022-2836(05)80271-2 REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH R.HENDERSON,J.S.JUBB,S.WHYTOCK REMARK 1 TITL SPECIFIC LABELLING OF THE PROTEIN AND LIPID ON THE REMARK 1 TITL 2 EXTRACELLULAR SURFACE OF PURPLE MEMBRANE REMARK 1 REF J.MOL.BIOL. V. 123 259 1978 REMARK 1 REFN ISSN 0022-2836 REMARK 1 REFERENCE 2 REMARK 1 AUTH R.HENDERSON,P.N.T.UNWIN REMARK 1 TITL THREE-DIMENSIONAL MODEL OF PURPLE MEMBRANE OBTAINED BY REMARK 1 TITL 2 ELECTRON MICROSCOPY REMARK 1 REF NATURE V. 257 28 1975 REMARK 1 REFN ISSN 0028-0836 REMARK 2 REMARK 2 RESOLUTION. 3.50 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : NULL REMARK 3 AUTHORS : NULL REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 3.50 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : NULL REMARK 3 DATA CUTOFF (SIGMA(F)) : NULL REMARK 3 DATA CUTOFF HIGH (ABS(F)) : NULL REMARK 3 DATA CUTOFF LOW (ABS(F)) : NULL REMARK 3 COMPLETENESS (WORKING+TEST) (%) : NULL REMARK 3 NUMBER OF REFLECTIONS : NULL REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT. REMARK 3 CROSS-VALIDATION METHOD : NULL REMARK 3 FREE R VALUE TEST SET SELECTION : NULL REMARK 3 R VALUE (WORKING SET) : NULL REMARK 3 FREE R VALUE : NULL REMARK 3 FREE R VALUE TEST SET SIZE (%) : NULL REMARK 3 FREE R VALUE TEST SET COUNT : NULL 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 : 1343 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 20 REMARK 3 SOLVENT ATOMS : 0 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : NULL REMARK 3 MEAN B VALUE (OVERALL, A**2) : NULL REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : NULL REMARK 3 B22 (A**2) : NULL REMARK 3 B33 (A**2) : NULL REMARK 3 B12 (A**2) : NULL REMARK 3 B13 (A**2) : NULL REMARK 3 B23 (A**2) : NULL REMARK 3 REMARK 3 ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM LUZZATI PLOT (A) : NULL REMARK 3 ESD FROM SIGMAA (A) : NULL REMARK 3 LOW RESOLUTION CUTOFF (A) : NULL REMARK 3 REMARK 3 CROSS-VALIDATED ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM C-V LUZZATI PLOT (A) : NULL REMARK 3 ESD FROM C-V SIGMAA (A) : NULL REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : NULL REMARK 3 BOND ANGLES (DEGREES) : NULL REMARK 3 DIHEDRAL ANGLES (DEGREES) : NULL REMARK 3 IMPROPER ANGLES (DEGREES) : NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL MODEL : NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. RMS SIGMA REMARK 3 MAIN-CHAIN BOND (A**2) : NULL ; NULL REMARK 3 MAIN-CHAIN ANGLE (A**2) : NULL ; NULL REMARK 3 SIDE-CHAIN BOND (A**2) : NULL ; NULL REMARK 3 SIDE-CHAIN ANGLE (A**2) : NULL ; NULL REMARK 3 REMARK 3 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: REMARK 3 A TEMPERATURE FACTOR OF 99.0 DENOTES SIDE CHAINS WITH NO REMARK 3 CLEAR DENSITY IN THE EXPERIMENTAL MAP OR WITH OTHER REMARK 3 AMBIGUITY. A TEMPERATURE FACTOR OF 20.0 DENOTES GOOD SIDE REMARK 3 CHAINS OR THE POLYPEPTIDE BACKBONE IN THE MAIN HELICAL REMARK 3 SEGMENTS. SOME SIDE CHAINS OF INTERMEDIATE QUALITY HAVE REMARK 3 TEMPERATURE FACTORS OF 40.0. REMARK 3 REMARK 3 THIS STRUCTURE WAS REFINED WITH RESIDUE 111 SPECIFIED AS REMARK 3 ILE. GENE SEQUENCING HAS SHOWN THAT THIS RESIDUE SHOULD BE REMARK 3 LEU. THIS HAS BEEN CORRECTED IN THIS ENTRY BY RENAMING REMARK 3 RESIDUE 111 AS LEU AND REMOVING THE SIDE CHAIN ATOMS BEYOND REMARK 3 CB. THIS WILL BE CORRECTED IN FUTURE MORE ACCURATE REMARK 3 COORDINATE SETS. REMARK 3 REMARK 3 THE DATA WAS COLLECTED ON 2-DIMENSIONAL CRYSTALS AND HENCE REMARK 3 THE C-AXIS REPEAT DOES NOT CORRESPOND TO A REAL REPEAT, BUT REMARK 3 INSTEAD REFERS TO THE SAMPLING THAT IS USED TO DESCRIBE THE REMARK 3 CONTINUOUS TRANSFORM. THE C VALUE OF 100.0 IS THEREFORE REMARK 3 THE VALUE WHICH SHOULD BE USED IN INTERPRETING THE MEANING REMARK 3 OF THE L INDEX. REMARK 4 REMARK 4 1BRD COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY BNL. REMARK 100 THE DEPOSITION ID IS D_1000172025. REMARK 240 REMARK 240 EXPERIMENTAL DETAILS REMARK 240 RECONSTRUCTION METHOD : CRYSTALLOGRAPHY REMARK 240 SAMPLE TYPE : 2D ARRAY REMARK 240 SPECIMEN TYPE : NULL REMARK 240 DATA ACQUISITION REMARK 240 DATE OF DATA COLLECTION : NULL REMARK 240 TEMPERATURE (KELVIN) : NULL REMARK 240 PH : NULL REMARK 240 NUMBER OF CRYSTALS USED : NULL REMARK 240 MICROSCOPE MODEL : SIEMENS SULEIKA REMARK 240 DETECTOR TYPE : GENERIC FILM REMARK 240 ACCELERATION VOLTAGE (KV) : 100 REMARK 240 NUMBER OF UNIQUE REFLECTIONS : NULL REMARK 240 RESOLUTION RANGE HIGH (A) : NULL REMARK 240 RESOLUTION RANGE LOW (A) : NULL REMARK 240 DATA SCALING SOFTWARE : NULL REMARK 240 COMPLETENESS FOR RANGE (%) : NULL REMARK 240 DATA REDUNDANCY : NULL REMARK 240 IN THE HIGHEST RESOLUTION SHELL REMARK 240 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) :NULL REMARK 240 HIGHEST RESOLUTION SHELL, RANGE LOW (A) :NULL REMARK 240 COMPLETENESS FOR SHELL (%) : NULL REMARK 240 DATA REDUNDANCY IN SHELL : NULL REMARK 240 R MERGE FOR SHELL (I) : NULL REMARK 240 METHOD USED TO DETERMINE THE STRUCTURE: NULL REMARK 240 SOFTWARE USED : NULL REMARK 240 STARTING MODEL : NULL REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 3 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 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 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 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 0.00000 REMARK 350 BIOMT2 2 0.866025 -0.500000 0.000000 0.00000 REMARK 350 BIOMT3 2 0.000000 0.000000 1.000000 0.00000 REMARK 350 BIOMT1 3 -0.500000 0.866025 0.000000 0.00000 REMARK 350 BIOMT2 3 -0.866025 -0.500000 0.000000 0.00000 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 PCA A 1 REMARK 465 ALA A 2 REMARK 465 GLN A 3 REMARK 465 ILE A 4 REMARK 465 THR A 5 REMARK 465 GLY A 6 REMARK 465 ARG A 7 REMARK 465 VAL A 34 REMARK 465 SER A 35 REMARK 465 ASP A 36 REMARK 465 PRO A 37 REMARK 465 TYR A 64 REMARK 465 GLY A 65 REMARK 465 LEU A 66 REMARK 465 THR A 67 REMARK 465 MET A 68 REMARK 465 VAL A 69 REMARK 465 PRO A 70 REMARK 465 PHE A 71 REMARK 465 GLY A 72 REMARK 465 GLY A 73 REMARK 465 ASP A 102 REMARK 465 ALA A 103 REMARK 465 ASP A 104 REMARK 465 GLN A 105 REMARK 465 LYS A 129 REMARK 465 VAL A 130 REMARK 465 TYR A 131 REMARK 465 SER A 132 REMARK 465 TYR A 133 REMARK 465 ARG A 134 REMARK 465 PHE A 135 REMARK 465 VAL A 136 REMARK 465 LYS A 159 REMARK 465 ALA A 160 REMARK 465 GLU A 161 REMARK 465 SER A 162 REMARK 465 MET A 163 REMARK 465 ARG A 164 REMARK 465 PRO A 165 REMARK 465 SER A 193 REMARK 465 GLU A 194 REMARK 465 GLY A 195 REMARK 465 ALA A 196 REMARK 465 GLY A 197 REMARK 465 ILE A 198 REMARK 465 VAL A 199 REMARK 465 PRO A 200 REMARK 465 LEU A 201 REMARK 465 ARG A 227 REMARK 465 ALA A 228 REMARK 465 ILE A 229 REMARK 465 PHE A 230 REMARK 465 GLY A 231 REMARK 465 GLU A 232 REMARK 465 ALA A 233 REMARK 465 GLU A 234 REMARK 465 ALA A 235 REMARK 465 PRO A 236 REMARK 465 GLU A 237 REMARK 465 PRO A 238 REMARK 465 SER A 239 REMARK 465 ALA A 240 REMARK 465 GLY A 241 REMARK 465 ASP A 242 REMARK 465 GLY A 243 REMARK 465 ALA A 244 REMARK 465 ALA A 245 REMARK 465 ALA A 246 REMARK 465 THR A 247 REMARK 465 SER A 248 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 GLY A 33 CA C O REMARK 470 GLY A 63 CA C O REMARK 470 VAL A 101 CA C O CB CG1 CG2 REMARK 470 LEU A 111 CG CD1 CD2 REMARK 470 THR A 128 CA C O CB OG1 CG2 REMARK 470 SER A 158 CA C O CB OG REMARK 470 GLY A 192 CA C O REMARK 470 SER A 226 CA C O CB OG 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 VAL A 217 CB - CA - C ANGL. DEV. = 12.3 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 LEU A 87 -72.92 -39.85 REMARK 500 LEU A 100 28.35 -75.87 REMARK 500 THR A 107 -67.36 -29.25 REMARK 500 LEU A 206 -71.29 -43.76 REMARK 500 ALA A 215 -70.39 -49.47 REMARK 500 REMARK 500 REMARK: NULL REMARK 650 REMARK 650 HELIX REMARK 650 THE ENDS OF THE HELICES ARE UNCERTAIN BY AT LEAST ONE REMARK 650 RESIDUE. IN ADDITION, PRO 50, PRO 91, AND PRO 186 ARE IN REMARK 650 THE MIDDLE OF HELICAL SEGMENTS BUT IN EACH CASE THE HELICES REMARK 650 ARE BENT NEAR THE PROLINE RESIDUES. 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 249 DBREF 1BRD A 2 248 UNP P02945 BACR_HALHA 15 261 SEQRES 1 A 248 PCA ALA GLN ILE THR GLY ARG PRO GLU TRP ILE TRP LEU SEQRES 2 A 248 ALA LEU GLY THR ALA LEU MET GLY LEU GLY THR LEU TYR SEQRES 3 A 248 PHE LEU VAL LYS GLY MET GLY VAL SER ASP PRO ASP ALA SEQRES 4 A 248 LYS LYS PHE TYR ALA ILE THR THR LEU VAL PRO ALA ILE SEQRES 5 A 248 ALA PHE THR MET TYR LEU SER MET LEU LEU GLY TYR GLY SEQRES 6 A 248 LEU THR MET VAL PRO PHE GLY GLY GLU GLN ASN PRO ILE SEQRES 7 A 248 TYR TRP ALA ARG TYR ALA ASP TRP LEU PHE THR THR PRO SEQRES 8 A 248 LEU LEU LEU LEU ASP LEU ALA LEU LEU VAL ASP ALA ASP SEQRES 9 A 248 GLN GLY THR ILE LEU ALA LEU VAL GLY ALA ASP GLY ILE SEQRES 10 A 248 MET ILE GLY THR GLY LEU VAL GLY ALA LEU THR LYS VAL SEQRES 11 A 248 TYR SER TYR ARG PHE VAL TRP TRP ALA ILE SER THR ALA SEQRES 12 A 248 ALA MET LEU TYR ILE LEU TYR VAL LEU PHE PHE GLY PHE SEQRES 13 A 248 THR SER LYS ALA GLU SER MET ARG PRO GLU VAL ALA SER SEQRES 14 A 248 THR PHE LYS VAL LEU ARG ASN VAL THR VAL VAL LEU TRP SEQRES 15 A 248 SER ALA TYR PRO VAL VAL TRP LEU ILE GLY SER GLU GLY SEQRES 16 A 248 ALA GLY ILE VAL PRO LEU ASN ILE GLU THR LEU LEU PHE SEQRES 17 A 248 MET VAL LEU ASP VAL SER ALA LYS VAL GLY PHE GLY LEU SEQRES 18 A 248 ILE LEU LEU ARG SER ARG ALA ILE PHE GLY GLU ALA GLU SEQRES 19 A 248 ALA PRO GLU PRO SER ALA GLY ASP GLY ALA ALA ALA THR SEQRES 20 A 248 SER HET RET A 249 20 HETNAM RET RETINAL FORMUL 2 RET C20 H28 O HELIX 1 A TRP A 10 MET A 32 1SEE REMARK 7. 23 HELIX 2 B ASP A 38 LEU A 62 1SEE REMARK 7. 25 HELIX 3 C TRP A 80 LEU A 100 1SEE REMARK 7. 21 HELIX 4 D ILE A 108 LEU A 127 1SEE REMARK 7. 20 HELIX 5 E TRP A 137 THR A 157 1SEE REMARK 7. 21 HELIX 6 F VAL A 167 ILE A 191 1SEE REMARK 7. 25 HELIX 7 G ILE A 203 ARG A 225 1SEE REMARK 7. 23 LINK NZ LYS A 216 C15 RET A 249 1555 1555 1.34 SITE 1 AC1 12 TRP A 86 THR A 89 THR A 90 LEU A 93 SITE 2 AC1 12 MET A 118 TRP A 138 MET A 145 TRP A 182 SITE 3 AC1 12 TYR A 185 TRP A 189 ASP A 212 LYS A 216 CRYST1 62.450 62.450 100.000 90.00 90.00 120.00 P 3 3 ORIGX1 0.866023 0.499996 0.000000 0.00000 ORIGX2 -0.499996 0.866023 0.000000 0.00000 ORIGX3 0.000000 0.000000 1.000000 0.00000 SCALE1 0.016013 0.009245 0.000000 0.00000 SCALE2 0.000000 0.018490 0.000000 0.00000 SCALE3 0.000000 0.000000 0.010000 0.00000