HEADER LUMINESCENT PROTEIN 13-MAR-00 1EL4 TITLE STRUCTURE OF THE CALCIUM-REGULATED PHOTOPROTEIN OBELIN TITLE 2 DETERMINED BY SULFUR SAS COMPND MOL_ID: 1; COMPND 2 MOLECULE: OBELIN; COMPND 3 CHAIN: A; COMPND 4 SYNONYM: OBL; COMPND 5 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: OBELIA LONGISSIMA; SOURCE 3 ORGANISM_TAXID: 32570; SOURCE 4 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 5 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 6 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 7 EXPRESSION_SYSTEM_PLASMID: PT7-7 KEYWDS BIOLUMINESCENCE, CALCIUM, PHOTOPROTEIN, OBELIN, SULFUR KEYWDS 2 ANOMALOUS SCATTERING, LUMINESCENT PROTEIN EXPDTA X-RAY DIFFRACTION AUTHOR Z.J.LIU,E.S.VYSOTSKI,J.ROSE,J.LEE,B.C.WANG REVDAT 3 24-FEB-09 1EL4 1 VERSN REVDAT 2 01-APR-03 1EL4 1 JRNL REVDAT 1 13-MAR-01 1EL4 0 JRNL AUTH Z.J.LIU,E.S.VYSOTSKI,C.J.CHEN,J.P.ROSE,J.LEE, JRNL AUTH 2 B.C.WANG JRNL TITL STRUCTURE OF THE CA2+-REGULATED PHOTOPROTEIN JRNL TITL 2 OBELIN AT 1.7 A RESOLUTION DETERMINED DIRECTLY JRNL TITL 3 FROM ITS SULFUR SUBSTRUCTURE. JRNL REF PROTEIN SCI. V. 9 2085 2000 JRNL REFN ISSN 0961-8368 JRNL PMID 11152120 REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH E.S.VYSOTSKI,Z.J.LIU,J.ROSE,B.C.WANG,J.LEE REMARK 1 TITL PREPARATION AND PRELIMINARY STUDY OF CRYSTALS OF REMARK 1 TITL 2 THE RECOMBINANT CALCIUM-REGULATED PHOTOPROTEIN REMARK 1 TITL 3 OBELIN FROM THE BIOLUMINESCENT HYDROID OBELIA REMARK 1 TITL 4 LONGISSIMA REMARK 1 REF ACTA CRYSTALLOGR.,SECT.D V. 55 1965 1999 REMARK 1 REFN ISSN 0907-4449 REMARK 1 DOI 10.1107/S0907444999011828 REMARK 2 REMARK 2 RESOLUTION. 1.73 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) : 1.73 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 19.84 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 260910.230 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.0000 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 97.5 REMARK 3 NUMBER OF REFLECTIONS : 33058 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) : 0.188 REMARK 3 FREE R VALUE : 0.205 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 8.100 REMARK 3 FREE R VALUE TEST SET COUNT : 2665 REMARK 3 ESTIMATED ERROR OF FREE R VALUE : 0.004 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 6 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 1.73 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.84 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 88.60 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 4611 REMARK 3 BIN R VALUE (WORKING SET) : 0.2610 REMARK 3 BIN FREE R VALUE : 0.3020 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 7.50 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 372 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.016 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 1556 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 34 REMARK 3 SOLVENT ATOMS : 266 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 17.50 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 18.60 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : 0.87000 REMARK 3 B22 (A**2) : 0.87000 REMARK 3 B33 (A**2) : -1.75000 REMARK 3 B12 (A**2) : 0.98000 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) : 0.18 REMARK 3 ESD FROM SIGMAA (A) : 0.15 REMARK 3 LOW RESOLUTION CUTOFF (A) : 5.00 REMARK 3 REMARK 3 CROSS-VALIDATED ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM C-V LUZZATI PLOT (A) : 0.21 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.18 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.005 REMARK 3 BOND ANGLES (DEGREES) : 1.10 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 19.60 REMARK 3 IMPROPER ANGLES (DEGREES) : 0.71 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) : 1.300 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 1.840 ; 2.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 2.480 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 3.590 ; 2.500 REMARK 3 REMARK 3 BULK SOLVENT MODELING. REMARK 3 METHOD USED : FLAT MODEL REMARK 3 KSOL : 0.37 REMARK 3 BSOL : 47.16 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 : PROTEIN_REP.PARAM REMARK 3 PARAMETER FILE 2 : ION.PARAM REMARK 3 PARAMETER FILE 3 : CROM5.PAR REMARK 3 PARAMETER FILE 4 : WATER.PARAM REMARK 3 PARAMETER FILE 5 : NULL REMARK 3 TOPOLOGY FILE 1 : PROTEIN.TOP REMARK 3 TOPOLOGY FILE 2 : ION.TOP REMARK 3 TOPOLOGY FILE 3 : CROM5.TOP REMARK 3 TOPOLOGY FILE 4 : WATER.TOP REMARK 3 TOPOLOGY FILE 5 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: THE STRUCTURE WAS DETERMINED USING REMARK 3 SINGLE WAVELENGTH ANOMALOUS SCATTERING DATA RECORDED FOR THE REMARK 3 NATIVE PROTEIN. DATA WERE RECORDED ON TWO OBELIN CRYSTALS TO REMARK 3 2.5 ANGSTROMS RESOLUTION AT BEAMLINE ID-17 (IMCA-CAT), REMARK 3 ADVANCED PHOTON SOURCE (APS), ARGONNE NATIONAL LABORATORY REMARK 3 USING A MARRESEARCH 165 MM CCD DETECTOR AND 1.74 ANGSTROM X- REMARK 3 RAYS. A DATA COLLECTION STRATEGY (HKL2000) WAS DETERMINED FROM REMARK 3 THE INITIAL IMAGE TO GIVE THE STARTING AND ENDING POINTS OF REMARK 3 THE DATA COLLECTION TO INSURE A MINIMUM DATA COMPLETENESS OF REMARK 3 98 PERCENT. DATA WERE COLLECTED USING THE "FREIDEL FLIP" REMARK 3 METHOD. DATA PROCESSING WAS CARRIED OUT USING HKL2000. THE REMARK 3 PROCESSED DATA FORMING THE TWO DATA SETS WERE MERGED TO REMARK 3 INCREASE REDUNDANCY (WU, ET AL., (2000) J. PROT. PEP. LETTS. REMARK 3 7, 25-32) AND SOLVE WAS USED TO DETERMINE THE SIX OF THE EIGHT REMARK 3 SULFUR ATOM POSITIONS. PHASES WAS USED TO REFINE THE SULFUR REMARK 3 POSITIONS AND TO LOCATE THE REMAINING SULFUR SITES BY BIJVOET REMARK 3 DIFFERENCE FOURIER ANALYSIS. THREE ADDITIONAL SITES WERE REMARK 3 IDENTIFIED SUGGESTING THAT ONE OF THE SULFUR SITES WAS MOST REMARK 3 PROBABLY AN ANOMALOUS SOLVENT SUCH AS CHLORIDE. ALL ANOMALOUS REMARK 3 SITES WERE TREATED AS SULFUR FOR THE PHASE CALCULATIONS. THE REMARK 3 NINE SULFUR SITES WERE USED TO ESTIMATE THE INITIAL PROTEIN REMARK 3 PHASES AT 3 ANGSTROM RESOLUTION USING SOLVENT FLATTENING REMARK 3 (ISAS, WANG, (1985) METHODS ENZYMOL. 115, 90 112). A REMARK 3 PRELIMINARY CHAIN TRACE WAS DONE USING THE 3.0 ANGSTROM MAP. REMARK 3 SEQUENCE ASSIGNMENT WAS BASED ON 8 SULFUR ATOM POSITIONS. THE REMARK 3 MODEL, 99 PERCENT COMPLETE WAS BUILT USING THE 3.0 ANGSTROM REMARK 3 SAS MAP. RESIDUE 1 WAS NOT OBSERVED IN THE ELECTRON DENSITY REMARK 3 AMPS AND IS PRESUMED TO BE DISORDERED. THE RESOLUTION OF THE REMARK 3 STRUCTURE WAS THEN EXTENDED TO 1.73 ANGSTROMS RESOLUTION REMARK 3 DURING THE FINAL STAGES OF REFINEMENT USING A MERGED DATA SET REMARK 3 COLLECTED FROM A SINGLE CRYSTAL RECORDED AT APS (BEAMLINE REMARK 3 ID19, WAVELENGTH 0.94 ANGSTROMS) AND AT ALS (BEAMLINE 5.0.2, REMARK 3 WAVELENGTH 1.0 ANGSTROMS). REMARK 4 REMARK 4 1EL4 COMPLIES WITH FORMAT V. 3.15, 01-DEC-08 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 20-MAR-00. REMARK 100 THE RCSB ID CODE IS RCSB010696. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 18-SEP-99; 10-JUN-99; 05-APR- REMARK 200 99 REMARK 200 TEMPERATURE (KELVIN) : 100; 100; 100 REMARK 200 PH : 6.0 REMARK 200 NUMBER OF CRYSTALS USED : 3 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y; Y; Y REMARK 200 RADIATION SOURCE : APS; APS; ALS REMARK 200 BEAMLINE : 17-ID; 19-ID; 5.0.2 REMARK 200 X-RAY GENERATOR MODEL : NULL; NULL; NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M; NULL; NULL REMARK 200 WAVELENGTH OR RANGE (A) : 1.74; 0.94; 1.0 REMARK 200 MONOCHROMATOR : NULL; NULL; NULL REMARK 200 OPTICS : NULL; NULL; NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD; CCD; CCD REMARK 200 DETECTOR MANUFACTURER : MARRESEARCH; APS-1; ADSC REMARK 200 QUANTUM 4 REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : HKL-2000 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 33694 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.730 REMARK 200 RESOLUTION RANGE LOW (A) : 20.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 2.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 99.5 REMARK 200 DATA REDUNDANCY : 5.800 REMARK 200 R MERGE (I) : 0.03800 REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : 37.6000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.73 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.79 REMARK 200 COMPLETENESS FOR SHELL (%) : 97.1 REMARK 200 DATA REDUNDANCY IN SHELL : 5.00 REMARK 200 R MERGE FOR SHELL (I) : 0.21600 REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 FOR SHELL : NULL REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH; NULL; NULL REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: SULFUR SAS REMARK 200 SOFTWARE USED: SOLVE, ISAS REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: STRUCTURE DETERMINED USING THE SULFUR SAS SIGNAL REMARK 200 RECORDED AT ID17, APS USING 1.74 ANGSTROM X-RAYS (SEE REMARK 3 REMARK 200 REFINEMENT DETAILS) REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 62.00 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 3.79 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: HANGING DROP VAPOR DIFFUSION USING REMARK 280 5 MICROLITER DROPS CONTAINING EQUAL VOLUMES OF PROTEIN REMARK 280 CONCENTRATE (10 MG/ML) AND RESERVOIR SOLUTION: CONTAINING 1.4 REMARK 280 M SODIUM CITRATE, PH 6.0., VAPOR DIFFUSION, HANGING DROP, REMARK 280 TEMPERATURE 277K REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 62 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -Y,X-Y,Z+2/3 REMARK 290 3555 -X+Y,-X,Z+1/3 REMARK 290 4555 -X,-Y,Z REMARK 290 5555 Y,-X+Y,Z+2/3 REMARK 290 6555 X-Y,X,Z+1/3 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 57.39200 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 28.69600 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 0.00000 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 57.39200 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 28.69600 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 300 REMARK: THE BIOLOGICAL ASSEMBLY IS A MONOMER. 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: MONOMERIC 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 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 MET A 1 REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: TORSION ANGLES REMARK 500 REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS: REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 STANDARD TABLE: REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2) REMARK 500 REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI- REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400 REMARK 500 REMARK 500 M RES CSSEQI PSI PHI REMARK 500 ASP A 12 57.99 -152.09 REMARK 500 ASP A 49 -73.77 -104.86 REMARK 500 SER A 145 72.31 -153.65 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 CL A 196 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CTZ A 197 DBREF 1EL4 A 1 195 UNP Q27709 OBL_OBELO 1 195 SEQRES 1 A 195 MET SER SER LYS TYR ALA VAL LYS LEU LYS THR ASP PHE SEQRES 2 A 195 ASP ASN PRO ARG TRP ILE LYS ARG HIS LYS HIS MET PHE SEQRES 3 A 195 ASP PHE LEU ASP ILE ASN GLY ASN GLY LYS ILE THR LEU SEQRES 4 A 195 ASP GLU ILE VAL SER LYS ALA SER ASP ASP ILE CYS ALA SEQRES 5 A 195 LYS LEU GLU ALA THR PRO GLU GLN THR LYS ARG HIS GLN SEQRES 6 A 195 VAL CYS VAL GLU ALA PHE PHE ARG GLY CYS GLY MET GLU SEQRES 7 A 195 TYR GLY LYS GLU ILE ALA PHE PRO GLN PHE LEU ASP GLY SEQRES 8 A 195 TRP LYS GLN LEU ALA THR SER GLU LEU LYS LYS TRP ALA SEQRES 9 A 195 ARG ASN GLU PRO THR LEU ILE ARG GLU TRP GLY ASP ALA SEQRES 10 A 195 VAL PHE ASP ILE PHE ASP LYS ASP GLY SER GLY THR ILE SEQRES 11 A 195 THR LEU ASP GLU TRP LYS ALA TYR GLY LYS ILE SER GLY SEQRES 12 A 195 ILE SER PRO SER GLN GLU ASP CYS GLU ALA THR PHE ARG SEQRES 13 A 195 HIS CYS ASP LEU ASP ASN SER GLY ASP LEU ASP VAL ASP SEQRES 14 A 195 GLU MET THR ARG GLN HIS LEU GLY PHE TRP TYR THR LEU SEQRES 15 A 195 ASP PRO GLU ALA ASP GLY LEU TYR GLY ASN GLY VAL PRO HET CL A 196 1 HET CTZ A 197 33 HETNAM CL CHLORIDE ION HETNAM CTZ C2-HYDROXY-COELENTERAZINE HETSYN CTZ 8-BENZYL-2-HYDROXY-2-(4-HYDROXY-BENZYL)-6-(4-HYDROXY- HETSYN 2 CTZ PHENYL)-2H-IMIDAZO[1,2-A]PYRAZIN-3-ONE FORMUL 2 CL CL 1- FORMUL 3 CTZ C26 H21 N3 O4 FORMUL 4 HOH *266(H2 O) HELIX 1 1 ASN A 15 ASP A 30 1 16 HELIX 2 2 THR A 38 ASP A 48 1 11 HELIX 3 3 ASP A 49 LEU A 54 1 6 HELIX 4 4 THR A 57 GLY A 74 1 18 HELIX 5 5 PHE A 85 ARG A 105 1 21 HELIX 6 6 THR A 109 PHE A 122 1 14 HELIX 7 7 THR A 131 GLY A 143 1 13 HELIX 8 8 SER A 147 CYS A 158 1 12 HELIX 9 9 VAL A 168 TYR A 180 1 13 HELIX 10 10 ASP A 183 ASP A 187 5 5 SHEET 1 A 2 LYS A 36 ILE A 37 0 SHEET 2 A 2 ILE A 83 ALA A 84 -1 N ILE A 83 O ILE A 37 SHEET 1 B 2 THR A 129 ILE A 130 0 SHEET 2 B 2 LEU A 166 ASP A 167 -1 O LEU A 166 N ILE A 130 SITE 1 AC1 4 ARG A 112 THR A 172 HOH A 301 HOH A 303 SITE 1 AC2 16 HIS A 22 MET A 25 ILE A 42 ILE A 50 SITE 2 AC2 16 PHE A 88 TRP A 92 TRP A 114 GLY A 115 SITE 3 AC2 16 PHE A 119 TRP A 135 TYR A 138 MET A 171 SITE 4 AC2 16 HIS A 175 TRP A 179 TYR A 190 HOH A 239 CRYST1 81.562 81.562 86.088 90.00 90.00 120.00 P 62 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 0.012261 0.007079 0.000000 0.00000 SCALE2 0.000000 0.014157 0.000000 0.00000 SCALE3 0.000000 0.000000 0.011616 0.00000 MASTER 310 0 2 10 4 0 5 6 0 0 0 15 END