HEADER TOXIN 15-JAN-88 3EBX TITLE REFINEMENT AT 1.4 ANGSTROMS RESOLUTION OF A MODEL OF ERABUTOXIN B. TITLE 2 TREATMENT OF ORDERED SOLVENT AND DISCRETE DISORDER COMPND MOL_ID: 1; COMPND 2 MOLECULE: ERABUTOXIN B; 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 J.L.SMITH,P.W.R.CORFIELD,W.A.HENDRICKSON,B.W.LOW REVDAT 6 29-NOV-17 3EBX 1 HELIX REVDAT 5 01-SEP-09 3EBX 1 REMARK REVDAT 4 24-FEB-09 3EBX 1 VERSN REVDAT 3 01-APR-03 3EBX 1 JRNL REVDAT 2 09-OCT-88 3EBX 1 JRNL REVDAT 1 16-APR-88 3EBX 0 SPRSDE 16-APR-88 3EBX 2EBX JRNL AUTH J.L.SMITH,P.W.CORFIELD,W.A.HENDRICKSON,B.W.LOW JRNL TITL REFINEMENT AT 1.4 A RESOLUTION OF A MODEL OF ERABUTOXIN B: JRNL TITL 2 TREATMENT OF ORDERED SOLVENT AND DISCRETE DISORDER. JRNL REF ACTA CRYSTALLOGR.,SECT.A V. 44 357 1988 JRNL REFN ISSN 0108-7673 JRNL PMID 3272151 JRNL DOI 10.1107/S0108767388000303 REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH B.W.LOW,P.W.R.CORFIELD REMARK 1 TITL ACETYLCHOLINE RECEPTOR. ALPHA-TOXIN BINDING SITE-THEORETICAL REMARK 1 TITL 2 AND MODEL STUDIES REMARK 1 REF ASIA PAC.J.PHARMACOL. V. 2 115 1987 REMARK 1 REFN ISSN 0217-9687 REMARK 1 REFERENCE 2 REMARK 1 AUTH B.W.LOW,P.W.R.CORFIELD REMARK 1 TITL ERABUTOXIN B. STRUCTURE(SLASH)FUNCTION RELATIONSHIPS REMARK 1 TITL 2 FOLLOWING INITIAL PROTEIN REFINEMENT AT 0.140-NM RESOLUTION REMARK 1 REF EUR.J.BIOCHEM. V. 161 579 1986 REMARK 1 REFN ISSN 0014-2956 REMARK 1 REFERENCE 3 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-NM RESOLUTION REMARK 1 REF EUR.J.BIOCHEM. V. 153 521 1985 REMARK 1 REFN ISSN 0014-2956 REMARK 1 REFERENCE 4 REMARK 1 AUTH J.DRENTH,B.W.LOW,J.S.RICHARDSON,C.S.WRIGHT REMARK 1 TITL THE TOXIN-AGGLUTININ FOLD. A NEW GROUP OF SMALL PROTEIN REMARK 1 TITL 2 STRUCTURES ORGANIZED AROUND A FOUR-DISULFIDE CORE REMARK 1 REF J.BIOL.CHEM. V. 255 2652 1980 REMARK 1 REFN ISSN 0021-9258 REMARK 1 REFERENCE 5 REMARK 1 AUTH M.R.KIMBALL,A.SATO,J.S.RICHARDSON,L.S.ROSEN,B.W.LOW REMARK 1 TITL MOLECULAR CONFORMATION OF ERABUTOXIN B. ATOMIC COORDINATES REMARK 1 TITL 2 AT 2.5 ANGSTROMS RESOLUTION REMARK 1 REF BIOCHEM.BIOPHYS.RES.COMMUN. V. 88 950 1979 REMARK 1 REFN ISSN 0006-291X REMARK 1 REFERENCE 6 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 7 REMARK 1 AUTH B.W.LOW,H.S.PRESTON,A.SATO,L.S.ROSEN,J.E.SEARL,A.D.RUDKO, REMARK 1 AUTH 2 J.S.RICHARDSON REMARK 1 TITL THREE DIMENSIONAL STRUCTURE OF ERABUTOXIN B NEUROTOXIC REMARK 1 TITL 2 PROTEIN. INHIBITOR OF ACETYLCHOLINE RECEPTOR REMARK 1 REF PROC.NATL.ACAD.SCI.USA V. 73 2991 1976 REMARK 1 REFN ISSN 0027-8424 REMARK 1 REFERENCE 8 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. 1.40 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) : 1.40 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 10.00 REMARK 3 DATA CUTOFF (SIGMA(F)) : 2.000 REMARK 3 COMPLETENESS FOR RANGE (%) : NULL REMARK 3 NUMBER OF REFLECTIONS : 7732 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) : 0.140 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) : 10405 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 475 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 5 REMARK 3 SOLVENT ATOMS : 111 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) : 0.016 ; NULL REMARK 3 ANGLE DISTANCE (A) : NULL ; NULL REMARK 3 INTRAPLANAR 1-4 DISTANCE (A) : NULL ; NULL REMARK 3 H-BOND OR METAL COORDINATION (A) : NULL ; NULL REMARK 3 REMARK 3 PLANE RESTRAINT (A) : NULL ; NULL REMARK 3 CHIRAL-CENTER RESTRAINT (A**3) : NULL ; NULL REMARK 3 REMARK 3 NON-BONDED CONTACT RESTRAINTS. REMARK 3 SINGLE TORSION (A) : NULL ; NULL REMARK 3 MULTIPLE TORSION (A) : NULL ; NULL REMARK 3 H-BOND (X...Y) (A) : NULL ; NULL REMARK 3 H-BOND (X-H...Y) (A) : NULL ; NULL REMARK 3 REMARK 3 CONFORMATIONAL TORSION ANGLE RESTRAINTS. REMARK 3 SPECIFIED (DEGREES) : NULL ; NULL REMARK 3 PLANAR (DEGREES) : NULL ; NULL REMARK 3 STAGGERED (DEGREES) : NULL ; NULL REMARK 3 TRANSVERSE (DEGREES) : NULL ; 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 OTHER REFINEMENT REMARKS: REMARK 3 SHIFTS FROM ENTRY *2EBX* IN POSITIONS OF NON-DISORDERED REMARK 3 PROTEIN ATOMS ARE VERY SMALL. THE RMS DEVIATION IS 0.5 REMARK 3 ANGSTROMS FOR ALL NON-DISORDERED ATOMS AND 0.07 ANGSTROMS REMARK 3 FOR MAIN CHAIN ATOMS. REMARK 4 REMARK 4 3EBX 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_1000178946. 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 (%): 32.58 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 1.82 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 24.97004 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 10.65008 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 23.29048 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 10.65008 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 24.97004 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 23.29048 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 450 REMARK 450 SOURCE REMARK 450 THE PREVIOUS REFINEMENT ESTABLISHED THE STRUCTURAL IDENTITY REMARK 450 OF ERABUTOXIN B AND NEUROTOXIN B. ERABUTOXIN B WAS REMARK 450 ISOLATED FROM THE VENOM OF LATICAUDA SEMIFASCIATA FOUND OFF REMARK 450 THE OKINAWAS (RYUKU ISLANDS). NEUROTOXIN B WAS ALSO REMARK 450 ISOLATED FROM THE VENOM OF LATICAUDA SEMIFASCIATA BUT FOUND REMARK 450 IN DIFFERENT PACIFIC OCEAN WATERS. PREVIOUS CHEMICAL REMARK 450 SEQUENCE ERRORS IN THESE TOXINS AT HIS 6-GLU 7 AND REMARK 450 SER 18-PRO 19 WERE CORRECTED IN ENTRY *2EBX*. THE CHEMICAL REMARK 450 DESIGNATION VAL 59 (CITED AS ARG 59 IN NEUROTOXIN B) WAS REMARK 450 ALSO UNAMBIGUOUSLY VERIFED. 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 OD2 ASP A 31 OG SER A 53 1556 2.07 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 ARG A 1 NE - CZ - NH2 ANGL. DEV. = -4.3 DEGREES REMARK 500 PHE A 4 CB - CG - CD2 ANGL. DEV. = -5.7 DEGREES REMARK 500 ASP A 31 CB - CG - OD1 ANGL. DEV. = 6.1 DEGREES REMARK 500 ARG A 33 CD - NE - CZ ANGL. DEV. = 10.4 DEGREES REMARK 500 ARG A 39 NE - CZ - NH1 ANGL. DEV. = -4.5 DEGREES REMARK 500 ARG A 39 NE - CZ - NH2 ANGL. DEV. = 5.0 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 -123.85 41.41 REMARK 500 SER A 8 -122.81 41.41 REMARK 500 VAL A 59 48.00 38.25 REMARK 500 ASN A 61 33.78 -93.18 REMARK 500 REMARK 500 REMARK: NULL REMARK 700 REMARK 700 SHEET REMARK 700 THE BETA SHEET *DCE* WAS INADVERTENTLY NOT INCLUDED IN REMARK 700 ENTRY *2EBX*. REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: RCT REMARK 800 EVIDENCE_CODE: AUTHOR REMARK 800 SITE_DESCRIPTION: SERIES INVARIANT RESIDUES OF THE REACTIVE site 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: 5EBX RELATED DB: PDB REMARK 999 REMARK 999 SEQUENCE REMARK 999 THE POSTSYNAPTIC NEUROTOXINS OF SEA SNAKE VENOM ARE REMARK 999 ANTAGONISTS OF THE NICOTINIC ACETYLCHOLINE RECEPTOR. THE REMARK 999 HOMOLOGY BETWEEN ALL THESE VENOM NEUROTOXINS OF BOTH SHORT REMARK 999 AND LONG CHAIN SERIES IS ACKNOWLEDGED IN SOME PUBLICATIONS REMARK 999 BY SEQUENCE NUMBER CHANGES (SEE REFERENCE 6 ABOVE FOR REMARK 999 DETAILS). DBREF 3EBX A 1 62 UNP Q90VW1 NXSB_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 HIS 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 *111(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 CYS A 41 0 SHEET 2 DCE 3 SER A 23 ASP A 31 -1 N TYR A 25 O GLY A 40 SHEET 3 DCE 3 ILE A 50 CYS A 55 -1 O SER A 53 N HIS A 26 SSBOND 1 CYS A 3 CYS A 24 1555 1555 2.04 SSBOND 2 CYS A 17 CYS A 41 1555 1555 2.00 SSBOND 3 CYS A 43 CYS A 54 1555 1555 2.06 SSBOND 4 CYS A 55 CYS A 60 1555 1555 2.04 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 HOH A 74 SITE 2 AC1 7 HOH A 146 HOH A 150 HOH A 163 CRYST1 49.940 46.580 21.590 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 0.020024 0.000000 0.000000 0.00000 SCALE2 0.000000 0.021468 0.000000 0.00000 SCALE3 0.000000 0.000000 0.046948 0.00000