HEADER TOXIN 20-DEC-89 5EBX TITLE THE CRYSTAL STRUCTURE OF ERABUTOXIN A AT 2.0 ANGSTROMS RESOLUTION COMPND MOL_ID: 1; COMPND 2 MOLECULE: ERABUTOXIN A; COMPND 3 CHAIN: A; COMPND 4 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: LATICAUDA SEMIFASCIATA; SOURCE 3 ORGANISM_COMMON: BROAD-BANDED BLUE SEA KRAIT; SOURCE 4 ORGANISM_TAXID: 8631 KEYWDS TOXIN EXPDTA X-RAY DIFFRACTION AUTHOR P.W.R.CORFIELD,T.-J.LEE,B.W.LOW REVDAT 4 29-NOV-17 5EBX 1 HELIX REVDAT 3 24-FEB-09 5EBX 1 VERSN REVDAT 2 01-APR-03 5EBX 1 JRNL REVDAT 1 15-APR-90 5EBX 0 JRNL AUTH P.W.CORFIELD,T.J.LEE,B.W.LOW JRNL TITL THE CRYSTAL STRUCTURE OF ERABUTOXIN A AT 2.0-A RESOLUTION. JRNL REF J.BIOL.CHEM. V. 264 9239 1989 JRNL REFN ISSN 0021-9258 JRNL PMID 2722828 REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH J.L.SMITH,P.W.R.CORFIELD,W.A.HENDRICKSON,B.W.LOW REMARK 1 TITL REFINEMENT AT 1.4 ANGSTROMS RESOLUTION OF A MODEL OF REMARK 1 TITL 2 ERABUTOXIN B. TREATMENT OF ORDERED SOLVENT AND DISCRETE REMARK 1 TITL 3 DISORDER REMARK 1 REF ACTA CRYSTALLOGR.,SECT.A V. 44 357 1988 REMARK 1 REFN ISSN 0108-7673 REMARK 1 REFERENCE 2 REMARK 1 AUTH W.RADDING,P.W.R.CORFIELD,L.S.LEVINSON,G.A.HASHIM,B.W.LOW REMARK 1 TITL ALPHA-TOXIN BINDING TO ACETYLCHOLINE RECEPTOR ALPHA 179-191 REMARK 1 TITL 2 PEPTIDES. INTRINSIC FLUORESCENCE STUDIES REMARK 1 REF FEBS LETT. V. 231 212 1988 REMARK 1 REFN ISSN 0014-5793 REMARK 1 REFERENCE 3 REMARK 1 AUTH B.W.LOW,P.W.R.CORFIELD REMARK 1 TITL ACETYLCHOLINE RECEPTOR. ALPHA-TOXIN BINDING SITE. REMARK 1 TITL 2 THEORETICAL AND MODEL STUDIES REMARK 1 REF ASIA PAC.J.PHARMACOL. V. 2 115 1987 REMARK 1 REFN ISSN 0217-9687 REMARK 1 REFERENCE 4 REMARK 1 AUTH P.E.BOURNE,A.SATO,P.W.R.CORFIELD,L.S.ROSEN,S.BIRKEN,B.W.LOW REMARK 1 TITL ERABUTOXIN B. INITIAL PROTEIN REFINEMENT AND SEQUENCE REMARK 1 TITL 2 ANALYSIS AT 0.140 NANOMETERS RESOLUTION REMARK 1 REF EUR.J.BIOCHEM. V. 153 521 1985 REMARK 1 REFN ISSN 0014-2956 REMARK 1 REFERENCE 5 REMARK 1 AUTH B.W.LOW REMARK 1 TITL THE THREE-DIMENSIONAL STRUCTURE OF POSTSYNAPTIC SNAKE REMARK 1 TITL 2 NEUROTOXINS. CONSIDERATION OF STRUCTURE AND FUNCTION REMARK 1 REF HANDB.EXP.PHARMACOL. V. 52 213 1979 REMARK 1 REFN ISSN 0171-2004 REMARK 1 REFERENCE 6 REMARK 1 AUTH B.W.LOW,R.POTTER,R.B.JACKSON,N.TAMIYA,S.SATO REMARK 1 TITL X-RAY CRYSTALLOGRAPHIC STUDY OF THE ERABUTOXINS AND OF A REMARK 1 TITL 2 DIIODO DERIVATIVE REMARK 1 REF J.BIOL.CHEM. V. 246 4366 1971 REMARK 1 REFN ISSN 0021-9258 REMARK 2 REMARK 2 RESOLUTION. 2.00 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : PROLSQ REMARK 3 AUTHORS : KONNERT,HENDRICKSON REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 2.00 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 10.00 REMARK 3 DATA CUTOFF (SIGMA(F)) : NULL REMARK 3 COMPLETENESS FOR RANGE (%) : NULL REMARK 3 NUMBER OF REFLECTIONS : 2680 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 + TEST SET) : 0.168 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 REMARK 3 FIT/AGREEMENT OF MODEL WITH ALL DATA. REMARK 3 R VALUE (WORKING + TEST SET, NO CUTOFF) : NULL REMARK 3 R VALUE (WORKING SET, NO CUTOFF) : NULL REMARK 3 FREE R VALUE (NO CUTOFF) : NULL REMARK 3 FREE R VALUE TEST SET SIZE (%, NO CUTOFF) : NULL REMARK 3 FREE R VALUE TEST SET COUNT (NO CUTOFF) : NULL REMARK 3 TOTAL NUMBER OF REFLECTIONS (NO CUTOFF) : NULL REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 473 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 5 REMARK 3 SOLVENT ATOMS : 62 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 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 DISTANCE RESTRAINTS. RMS SIGMA REMARK 3 BOND LENGTH (A) : 0.011 ; 0.020 REMARK 3 ANGLE DISTANCE (A) : 0.026 ; 0.030 REMARK 3 INTRAPLANAR 1-4 DISTANCE (A) : 0.040 ; 0.060 REMARK 3 H-BOND OR METAL COORDINATION (A) : NULL ; NULL REMARK 3 REMARK 3 PLANE RESTRAINT (A) : 0.010 ; 0.020 REMARK 3 CHIRAL-CENTER RESTRAINT (A**3) : 0.130 ; 0.150 REMARK 3 REMARK 3 NON-BONDED CONTACT RESTRAINTS. REMARK 3 SINGLE TORSION (A) : 0.130 ; 0.200 REMARK 3 MULTIPLE TORSION (A) : 0.150 ; 0.200 REMARK 3 H-BOND (X...Y) (A) : NULL ; NULL REMARK 3 H-BOND (X-H...Y) (A) : 0.144 ; 0.200 REMARK 3 REMARK 3 CONFORMATIONAL TORSION ANGLE RESTRAINTS. REMARK 3 SPECIFIED (DEGREES) : NULL ; NULL REMARK 3 PLANAR (DEGREES) : 2.000 ; 3.000 REMARK 3 STAGGERED (DEGREES) : 19.800; 15.000 REMARK 3 TRANSVERSE (DEGREES) : NULL ; NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. RMS SIGMA REMARK 3 MAIN-CHAIN BOND (A**2) : 0.661 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 1.100 ; 2.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 1.276 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 1.986 ; 3.000 REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL REMARK 4 REMARK 4 5EBX 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_1000179701. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : NULL REMARK 200 TEMPERATURE (KELVIN) : NULL REMARK 200 PH : NULL REMARK 200 NUMBER OF CRYSTALS USED : NULL REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : NULL REMARK 200 RADIATION SOURCE : NULL REMARK 200 BEAMLINE : NULL REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : NULL REMARK 200 WAVELENGTH OR RANGE (A) : NULL REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : NULL REMARK 200 DETECTOR MANUFACTURER : NULL REMARK 200 INTENSITY-INTEGRATION SOFTWARE : NULL REMARK 200 DATA SCALING SOFTWARE : NULL REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : NULL REMARK 200 RESOLUTION RANGE HIGH (A) : NULL REMARK 200 RESOLUTION RANGE LOW (A) : NULL REMARK 200 REJECTION CRITERIA (SIGMA(I)) : NULL REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : NULL REMARK 200 DATA REDUNDANCY : NULL REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : NULL REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : NULL REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : NULL REMARK 200 COMPLETENESS FOR SHELL (%) : NULL REMARK 200 DATA REDUNDANCY IN SHELL : NULL REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 FOR SHELL : NULL REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: NULL REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: NULL REMARK 200 SOFTWARE USED: NULL REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 31.39 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 1.79 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: NULL REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 21 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X+1/2,-Y,Z+1/2 REMARK 290 3555 -X,Y+1/2,-Z+1/2 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 25.07000 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 10.43500 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 23.48500 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 10.43500 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 25.07000 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 23.48500 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: 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 400 REMARK 400 COMPOUND REMARK 400 ERABUTOXINS A AND B ARE SHORT-CHAIN POSTSYNAPTIC REMARK 400 NEUROTOXINS ISOLATED FROM THE VENOM OF THE SEA-SNAKE REMARK 400 LATICAUDA SEMIFASCIA, FOUND OFF THE OKINAWAS. THE REMARK 400 POSTSYNAPTIC NEUROTOXINS ARE ANTAGONISTS OF THE NICOTINIC REMARK 400 ACETYLCHOLINE RECEPTOR. HOMOLOGY EXISTS BETWEEN ALL THESE REMARK 400 VENOM NEUROTOXINS FOR BOTH SHORT AND LONG CHAIN SERIES. REMARK 400 (SEE REFERENCE 6 ABOVE FOR DETAILS). REMARK 400 REMARK 400 THE CLOSE STRUCTURAL SIMILARITY BETWEEN EA AND EB, REMARK 400 PARTICULARLY BETWEEN THE EA AND EB REACTIVE SITE DOMAINS, REMARK 400 SUPPORTS THE HIGH RESOLUTION EB STRUCTURE AS A VALID REMARK 400 PROTOTYPE FOR ALL OF THE POSTSYNAPTIC NEUROTOXINS OF THE REMARK 400 SHORT SNAKE VENOM SERIES. IN ADDITION, THE SPECIFIC ROLE REMARK 400 PROPOSED (REFERENCE 4) FOR THE HIGHLY MOBILE PERIPHERAL REMARK 400 SEGMENT PRO 44 - GLY 49 IN NEUROTOXIN BINDING TO THE REMARK 400 ACETYLCHOLINE RECEPTOR, IS SUPPORTED BY THE DISTRIBUTION REMARK 400 OF THERMAL PARAMETERS IN THIS REGION OF EA. REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: CLOSE CONTACTS REMARK 500 REMARK 500 THE FOLLOWING ATOMS THAT ARE RELATED BY CRYSTALLOGRAPHIC REMARK 500 SYMMETRY ARE IN CLOSE CONTACT. AN ATOM LOCATED WITHIN 0.15 REMARK 500 ANGSTROMS OF A SYMMETRY RELATED ATOM IS ASSUMED TO BE ON A REMARK 500 SPECIAL POSITION AND IS, THEREFORE, LISTED IN REMARK 375 REMARK 500 INSTEAD OF REMARK 500. ATOMS WITH NON-BLANK ALTERNATE REMARK 500 LOCATION INDICATORS ARE NOT INCLUDED IN THE CALCULATIONS. REMARK 500 REMARK 500 DISTANCE CUTOFF: REMARK 500 2.2 ANGSTROMS FOR CONTACTS NOT INVOLVING HYDROGEN ATOMS REMARK 500 1.6 ANGSTROMS FOR CONTACTS INVOLVING HYDROGEN ATOMS REMARK 500 REMARK 500 ATM1 RES C SSEQI ATM2 RES C SSEQI SSYMOP DISTANCE REMARK 500 O VAL A 46 O HOH A 209 2565 2.00 REMARK 500 REMARK 500 REMARK: NULL 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 GLN A 10 CA - CB - CG ANGL. DEV. = 13.5 DEGREES REMARK 500 ASP A 31 CB - CG - OD2 ANGL. DEV. = -5.8 DEGREES REMARK 500 ARG A 33 NE - CZ - NH1 ANGL. DEV. = 5.1 DEGREES REMARK 500 ARG A 33 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 SER A 8 -110.65 33.90 REMARK 500 VAL A 59 52.62 32.54 REMARK 500 ASN A 61 35.18 -97.27 REMARK 500 REMARK 500 REMARK: NULL REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: RCT REMARK 800 EVIDENCE_CODE: AUTHOR REMARK 800 SITE_DESCRIPTION: THE SERIES INVARIANT RESIDUES OF THE REACTIVE REMARK 800 SITE. FIVE OF THESE RESIDUES (PHE 32, ILE 36, GLU 38, ILE 50, REMARK 800 LEU 52) ARE TYPE-CONSERVED THROUGHOUT THE SERIES. THE REMARK 800 ENUMERATION IS FOR A 62-RESIDUE TOXIN REMARK 800 REMARK 800 SITE_IDENTIFIER: FNR REMARK 800 EVIDENCE_CODE: AUTHOR REMARK 800 SITE_DESCRIPTION: RESIDUES IN THE REACTIVE SITE SHOWN CHEMICALLY REMARK 800 TO BIND DIRECTLY TO RECEPTOR REMARK 800 REMARK 800 SITE_IDENTIFIER: CMR REMARK 800 EVIDENCE_CODE: AUTHOR REMARK 800 SITE_DESCRIPTION: RESIDUES, INCLUDING FOUR CYSTINE LINKAGES, WHICH REMARK 800 AID IN MAINTAINING THE UNIQUE TOXIN FOLD CONFORMATION REMARK 800 REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 63 REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 3EBX RELATED DB: PDB DBREF 5EBX A 1 62 UNP P60775 NXSA_LATSE 22 83 SEQRES 1 A 62 ARG ILE CYS PHE ASN HIS GLN SER SER GLN PRO GLN THR SEQRES 2 A 62 THR LYS THR CYS SER PRO GLY GLU SER SER CYS TYR ASN SEQRES 3 A 62 LYS GLN TRP SER ASP PHE ARG GLY THR ILE ILE GLU ARG SEQRES 4 A 62 GLY CYS GLY CYS PRO THR VAL LYS PRO GLY ILE LYS LEU SEQRES 5 A 62 SER CYS CYS GLU SER GLU VAL CYS ASN ASN HET SO4 A 63 5 HETNAM SO4 SULFATE ION FORMUL 2 SO4 O4 S 2- FORMUL 3 HOH *62(H2 O) SHEET 1 AB 2 ARG A 1 ASN A 5 0 SHEET 2 AB 2 THR A 13 CYS A 17 -1 O LYS A 15 N CYS A 3 SHEET 1 DCE 3 GLY A 34 GLY A 42 0 SHEET 2 DCE 3 SER A 23 ASP A 31 -1 O GLY A 40 N TYR A 25 SHEET 3 DCE 3 ILE A 50 CYS A 55 1 O SER A 53 N ASN A 26 SSBOND 1 CYS A 3 CYS A 24 1555 1555 2.04 SSBOND 2 CYS A 17 CYS A 41 1555 1555 2.02 SSBOND 3 CYS A 43 CYS A 54 1555 1555 2.04 SSBOND 4 CYS A 55 CYS A 60 1555 1555 2.03 SITE 1 RCT 20 TYR A 25 LYS A 27 TRP A 29 ASP A 31 SITE 2 RCT 20 PHE A 32 ARG A 33 GLY A 34 ILE A 36 SITE 3 RCT 20 GLU A 38 GLY A 40 CYS A 41 GLY A 42 SITE 4 RCT 20 CYS A 43 PRO A 44 VAL A 46 LYS A 47 SITE 5 RCT 20 GLY A 49 ILE A 50 LEU A 52 CYS A 54 SITE 1 FNR 4 LYS A 27 TRP A 29 ARG A 33 LYS A 47 SITE 1 CMR 13 CYS A 3 PHE A 4 CYS A 17 CYS A 24 SITE 2 CMR 13 TYR A 25 GLY A 40 CYS A 41 GLY A 42 SITE 3 CMR 13 CYS A 43 CYS A 54 CYS A 55 CYS A 60 SITE 4 CMR 13 ASN A 61 SITE 1 AC1 7 ARG A 1 ASN A 5 LYS A 15 GLU A 56 SITE 2 AC1 7 HOH A 103 HOH A 112 HOH A 127 CRYST1 50.140 46.970 20.870 90.00 90.00 90.00 P 21 21 21 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 0.019944 0.000000 0.000000 0.00000 SCALE2 0.000000 0.021290 0.000000 0.00000 SCALE3 0.000000 0.000000 0.047916 0.00000