HEADER MEMBRANE PROTEIN 20-JAN-09 2W8X TITLE STRUCTURE OF THE TICK ION-CHANNEL MODULATOR RA-KLP COMPND MOL_ID: 1; COMPND 2 MOLECULE: ION-CHANNEL MODULATOR RAKLP; COMPND 3 CHAIN: A, B; COMPND 4 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: RHIPICEPHALUS APPENDICULATUS; SOURCE 3 ORGANISM_COMMON: TICK; SOURCE 4 ORGANISM_TAXID: 34631; SOURCE 5 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 6 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 7 EXPRESSION_SYSTEM_STRAIN: ORIGAMI(DE3) PLYSS; SOURCE 8 EXPRESSION_SYSTEM_VECTOR: ESCEHRICHIA COLI; SOURCE 9 EXPRESSION_SYSTEM_PLASMID: PET23A KEYWDS SALIVARY GLAND, KUNITZ DOMAINS, MAXIK CHANNEL ACTIVATION, SULPHUR KEYWDS 2 SAD, MEMBRANE PROTEIN EXPDTA X-RAY DIFFRACTION AUTHOR G.C.PAESEN,C.SIEBOLD,M.DALLAS,C.PEERS,K.HARLOS,P.A.NUTTALL,M.A.NUNN, AUTHOR 2 D.I.STUART,R.M.ESNOUF REVDAT 3 28-JUN-17 2W8X 1 REMARK REVDAT 2 09-JUN-09 2W8X 1 JRNL REVDAT 1 05-MAY-09 2W8X 0 JRNL AUTH G.C.PAESEN,C.SIEBOLD,M.L.DALLAS,C.PEERS,K.HARLOS, JRNL AUTH 2 P.A.NUTTALL,M.A.NUNN,D.I.STUART,R.M.ESNOUF JRNL TITL AN ION-CHANNEL MODULATOR FROM THE SALIVA OF THE BROWN EAR JRNL TITL 2 TICK HAS A HIGHLY MODIFIED KUNITZ/BPTI STRUCTURE. JRNL REF J.MOL.BIOL. V. 389 734 2009 JRNL REFN ISSN 0022-2836 JRNL PMID 19394347 JRNL DOI 10.1016/J.JMB.2009.04.045 REMARK 2 REMARK 2 RESOLUTION. 1.60 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : REFMAC 5.5.0047 REMARK 3 AUTHORS : MURSHUDOV,VAGIN,DODSON REMARK 3 REMARK 3 REFINEMENT TARGET : MAXIMUM LIKELIHOOD REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.60 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 20.00 REMARK 3 DATA CUTOFF (SIGMA(F)) : NULL REMARK 3 COMPLETENESS FOR RANGE (%) : 100.0 REMARK 3 NUMBER OF REFLECTIONS : 19062 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 + TEST SET) : 0.140 REMARK 3 R VALUE (WORKING SET) : 0.139 REMARK 3 FREE R VALUE : 0.173 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 3.700 REMARK 3 FREE R VALUE TEST SET COUNT : 736 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 20 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 1.60 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.64 REMARK 3 REFLECTION IN BIN (WORKING SET) : 1364 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : NULL REMARK 3 BIN R VALUE (WORKING SET) : 0.1160 REMARK 3 BIN FREE R VALUE SET COUNT : 65 REMARK 3 BIN FREE R VALUE : 0.1530 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 1107 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 15 REMARK 3 SOLVENT ATOMS : 162 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : NULL REMARK 3 MEAN B VALUE (OVERALL, A**2) : 13.67 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : 0.12000 REMARK 3 B22 (A**2) : -0.10000 REMARK 3 B33 (A**2) : -0.02000 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 OVERALL COORDINATE ERROR. REMARK 3 ESU BASED ON R VALUE (A): 0.098 REMARK 3 ESU BASED ON FREE R VALUE (A): 0.074 REMARK 3 ESU BASED ON MAXIMUM LIKELIHOOD (A): 0.034 REMARK 3 ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): 2.045 REMARK 3 REMARK 3 CORRELATION COEFFICIENTS. REMARK 3 CORRELATION COEFFICIENT FO-FC : 0.965 REMARK 3 CORRELATION COEFFICIENT FO-FC FREE : 0.941 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES COUNT RMS WEIGHT REMARK 3 BOND LENGTHS REFINED ATOMS (A): 1213 ; 0.015 ; 0.020 REMARK 3 BOND LENGTHS OTHERS (A): 875 ; 0.001 ; 0.020 REMARK 3 BOND ANGLES REFINED ATOMS (DEGREES): 1639 ; 1.431 ; 1.907 REMARK 3 BOND ANGLES OTHERS (DEGREES): 2061 ; 0.893 ; 3.016 REMARK 3 TORSION ANGLES, PERIOD 1 (DEGREES): 150 ; 6.452 ; 5.000 REMARK 3 TORSION ANGLES, PERIOD 2 (DEGREES): 73 ;25.812 ;22.329 REMARK 3 TORSION ANGLES, PERIOD 3 (DEGREES): 199 ;10.629 ;15.000 REMARK 3 TORSION ANGLES, PERIOD 4 (DEGREES): 18 ;11.190 ;15.000 REMARK 3 CHIRAL-CENTER RESTRAINTS (A**3): 151 ; 0.090 ; 0.200 REMARK 3 GENERAL PLANES REFINED ATOMS (A): 1435 ; 0.006 ; 0.020 REMARK 3 GENERAL PLANES OTHERS (A): 283 ; 0.001 ; 0.020 REMARK 3 NON-BONDED CONTACTS REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 NON-BONDED CONTACTS OTHERS (A): NULL ; NULL ; NULL REMARK 3 NON-BONDED TORSION REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 NON-BONDED TORSION OTHERS (A): NULL ; NULL ; NULL REMARK 3 H-BOND (X...Y) REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 H-BOND (X...Y) OTHERS (A): NULL ; NULL ; NULL REMARK 3 POTENTIAL METAL-ION REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 POTENTIAL METAL-ION OTHERS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY VDW REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY VDW OTHERS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY H-BOND REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY H-BOND OTHERS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY METAL-ION REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY METAL-ION OTHERS (A): NULL ; NULL ; NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. COUNT RMS WEIGHT REMARK 3 MAIN-CHAIN BOND REFINED ATOMS (A**2): 728 ; 1.415 ; 1.500 REMARK 3 MAIN-CHAIN BOND OTHER ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 MAIN-CHAIN ANGLE REFINED ATOMS (A**2): 1163 ; 2.357 ; 2.000 REMARK 3 MAIN-CHAIN ANGLE OTHER ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 SIDE-CHAIN BOND REFINED ATOMS (A**2): 485 ; 3.607 ; 3.000 REMARK 3 SIDE-CHAIN BOND OTHER ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 SIDE-CHAIN ANGLE REFINED ATOMS (A**2): 476 ; 5.671 ; 4.500 REMARK 3 SIDE-CHAIN ANGLE OTHER ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 LONG RANGE B REFINED ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 LONG RANGE B OTHER ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 REMARK 3 ANISOTROPIC THERMAL FACTOR RESTRAINTS. COUNT RMS WEIGHT REMARK 3 RIGID-BOND RESTRAINTS (A**2): NULL ; NULL ; NULL REMARK 3 SPHERICITY; FREE ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 SPHERICITY; BONDED ATOMS (A**2): NULL ; NULL ; NULL REMARK 3 REMARK 3 NCS RESTRAINTS STATISTICS REMARK 3 NUMBER OF DIFFERENT NCS GROUPS : NULL REMARK 3 REMARK 3 TLS DETAILS REMARK 3 NUMBER OF TLS GROUPS : NULL REMARK 3 REMARK 3 BULK SOLVENT MODELLING. REMARK 3 METHOD USED : MASK REMARK 3 PARAMETERS FOR MASK CALCULATION REMARK 3 VDW PROBE RADIUS : 1.20 REMARK 3 ION PROBE RADIUS : 0.80 REMARK 3 SHRINKAGE RADIUS : 0.80 REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: HYDROGENS HAVE BEEN ADDED IN THE RIDING REMARK 3 POSITIONS. REMARK 4 REMARK 4 2W8X COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBE ON 20-JAN-09. REMARK 100 THE DEPOSITION ID IS D_1290037256. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : NULL REMARK 200 TEMPERATURE (KELVIN) : 100 REMARK 200 PH : 7.5 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : SRS REMARK 200 BEAMLINE : PX14.1 REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.488 REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : ADSC CCD REMARK 200 INTENSITY-INTEGRATION SOFTWARE : DENZO REMARK 200 DATA SCALING SOFTWARE : SCALEPACK REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 23817 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.500 REMARK 200 RESOLUTION RANGE LOW (A) : 20.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 0.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 100.0 REMARK 200 DATA REDUNDANCY : 40.20 REMARK 200 R MERGE (I) : 0.08000 REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : 62.8000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.60 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.70 REMARK 200 COMPLETENESS FOR SHELL (%) : 100.0 REMARK 200 DATA REDUNDANCY IN SHELL : NULL REMARK 200 R MERGE FOR SHELL (I) : 0.29000 REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 FOR SHELL : 18.10 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: MAD REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: SAD REMARK 200 SOFTWARE USED: SNB, ACORN, ARP/WARP REMARK 200 STARTING MODEL: NONE REMARK 200 REMARK 200 REMARK: NONE REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 35.91 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 1.93 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: 10% (V/V) ETHANOL, 1.5M NACL, PH 7.5 REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 2 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 28.67450 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 32.84350 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 28.67450 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 32.84350 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 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DIMERIC REMARK 350 SOFTWARE USED: PISA REMARK 350 TOTAL BURIED SURFACE AREA: 1850 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 7910 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -5.0 KCAL/MOL 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 A2023 LIES ON A SPECIAL POSITION. REMARK 375 HOH A2054 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 HIS B 77 REMARK 465 HIS B 78 REMARK 465 HIS B 79 REMARK 465 HIS B 80 REMARK 465 HIS B 81 REMARK 465 HIS B 82 REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: CLOSE CONTACTS IN SAME ASYMMETRIC UNIT REMARK 500 REMARK 500 THE FOLLOWING ATOMS ARE IN CLOSE CONTACT. REMARK 500 REMARK 500 ATM1 RES C SSEQI ATM2 RES C SSEQI DISTANCE REMARK 500 OE1 GLN A 22 O HOH A 2021 2.18 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 ARG A 75 -71.43 -100.49 REMARK 500 CYS B 73 -32.41 -132.96 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 GOL A 1083 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ACT B 1077 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC3 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE IMD B 1078 DBREF 2W8X A 11 76 PDB 2W8X 2W8X 11 76 DBREF 2W8X A 77 82 PDB 2W8X 2W8X 77 82 DBREF 2W8X B 11 76 PDB 2W8X 2W8X 11 76 DBREF 2W8X B 77 82 PDB 2W8X 2W8X 77 82 SEQRES 1 A 72 PHE ASN CYS ASN LYS ARG GLU GLY PRO CYS SER GLN ARG SEQRES 2 A 72 SER LEU CYS GLU CYS ASP PRO ASN LEU GLN LEU GLY ARG SEQRES 3 A 72 HIS SER ASP GLN LEU TRP HIS TYR ASN LEU ARG THR ASN SEQRES 4 A 72 ARG CYS GLU ARG GLY GLY TYR ARG ASP ASN CYS ASN SER SEQRES 5 A 72 HIS SER SER SER GLY ALA CYS VAL MET ALA CYS GLU ARG SEQRES 6 A 72 ILE HIS HIS HIS HIS HIS HIS SEQRES 1 B 72 PHE ASN CYS ASN LYS ARG GLU GLY PRO CYS SER GLN ARG SEQRES 2 B 72 SER LEU CYS GLU CYS ASP PRO ASN LEU GLN LEU GLY ARG SEQRES 3 B 72 HIS SER ASP GLN LEU TRP HIS TYR ASN LEU ARG THR ASN SEQRES 4 B 72 ARG CYS GLU ARG GLY GLY TYR ARG ASP ASN CYS ASN SER SEQRES 5 B 72 HIS SER SER SER GLY ALA CYS VAL MET ALA CYS GLU ARG SEQRES 6 B 72 ILE HIS HIS HIS HIS HIS HIS HET GOL A1083 6 HET ACT B1077 4 HET IMD B1078 5 HETNAM GOL GLYCEROL HETNAM ACT ACETATE ION HETNAM IMD IMIDAZOLE HETSYN GOL GLYCERIN; PROPANE-1,2,3-TRIOL FORMUL 3 GOL C3 H8 O3 FORMUL 4 ACT C2 H3 O2 1- FORMUL 5 IMD C3 H5 N2 1+ FORMUL 6 HOH *162(H2 O) HELIX 1 1 ARG A 23 CYS A 28 1 6 HELIX 2 2 SER A 65 CYS A 73 1 9 HELIX 3 3 ARG A 75 HIS A 81 1 7 HELIX 4 4 SER B 21 CYS B 28 1 8 HELIX 5 5 SER B 65 GLU B 74 1 10 SHEET 1 AA 2 HIS A 37 ASN A 45 0 SHEET 2 AA 2 ARG A 50 TYR A 56 -1 O ARG A 50 N ASN A 45 SHEET 1 BA 2 HIS B 37 ASN B 45 0 SHEET 2 BA 2 ARG B 50 TYR B 56 -1 O ARG B 50 N ASN B 45 SSBOND 1 CYS A 13 CYS A 28 1555 1555 2.05 SSBOND 2 CYS A 20 CYS A 60 1555 1555 2.07 SSBOND 3 CYS A 26 CYS A 73 1555 1555 2.09 SSBOND 4 CYS A 51 CYS A 69 1555 1555 2.07 SSBOND 5 CYS B 13 CYS B 28 1555 1555 2.04 SSBOND 6 CYS B 20 CYS B 60 1555 1555 2.05 SSBOND 7 CYS B 26 CYS B 73 1555 1555 2.10 SSBOND 8 CYS B 51 CYS B 69 1555 1555 2.09 SITE 1 AC1 9 HIS A 63 ALA A 68 ALA A 72 HOH A2085 SITE 2 AC1 9 HOH A2086 HOH A2087 CYS B 20 HOH B2013 SITE 3 AC1 9 HOH B2058 SITE 1 AC2 7 HOH A2080 PRO B 30 ASN B 31 HIS B 37 SITE 2 AC2 7 HIS B 43 GLY B 54 HOH B2033 SITE 1 AC3 1 HIS B 37 CRYST1 57.349 65.687 38.472 90.00 90.00 90.00 P 21 21 2 8 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 0.017437 0.000000 0.000000 0.00000 SCALE2 0.000000 0.015224 0.000000 0.00000 SCALE3 0.000000 0.000000 0.025993 0.00000 MTRIX1 1 0.247800 -0.172770 -0.953280 10.17000 1 MTRIX2 1 -0.168610 -0.976640 0.133170 19.41000 1 MTRIX3 1 -0.954030 0.127740 -0.271140 9.85000 1