1ABT - Header Asymmetric Unit

HEADER TOXIN 17-NOV-93 1ABT

TITLE NMR SOLUTION STRUCTURE OF AN ALPHA-BUNGAROTOXIN(SLASH) TITLE 2 NICOTINIC RECEPTOR PEPTIDE COMPLEX

COMPND MOL_ID: 1; COMPND 2 MOLECULE: ALPHA-BUNGAROTOXIN; COMPND 3 CHAIN: A; COMPND 4 ENGINEERED: YES; COMPND 5 MOL_ID: 2; COMPND 6 MOLECULE: NICOTINIC RECEPTOR PEPTIDE; COMPND 7 CHAIN: B; COMPND 8 ENGINEERED: YES

SOURCE MOL_ID: 1; SOURCE 2 MOL_ID: 2

KEYWDS TOXIN

EXPDTA SOLUTION NMR

NUMMDL 4

AUTHOR V.J.BASUS,G.SONG,E.HAWROT

REVDAT 4 19-MAY-09 1ABT 1 REMARK REVDAT 3 24-FEB-09 1ABT 1 VERSN REVDAT 2 30-SEP-03 1ABT 1 JRNL DBREF REVDAT 1 31-JAN-94 1ABT 0

JRNL AUTH V.J.BASUS,G.SONG,E.HAWROT JRNL TITL NMR SOLUTION STRUCTURE OF AN JRNL TITL 2 ALPHA-BUNGAROTOXIN/NICOTINIC RECEPTOR PEPTIDE JRNL TITL 3 COMPLEX. JRNL REF BIOCHEMISTRY V. 32 12290 1993 JRNL REFN ISSN 0006-2960 JRNL PMID 8241115 JRNL DOI 10.1021/BI00097A004

REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH S.F.A.PEARCE,P.PRESTON-HURLBURT,E.HAWROT REMARK 1 TITL THE ROLE OF TYROSINE AT THE LIGAND-BINDING SITE OF REMARK 1 TITL 2 THE NICOTINIC ACETYLCHOLINE RECEPTOR REMARK 1 REF PROC.R.SOC.LONDON,SER.B V. 241 207 1990 REMARK 1 REFN ISSN 0080-4649 REMARK 1 REFERENCE 2 REMARK 1 AUTH V.J.BASUS,M.BILLETER,R.A.LOVE,R.M.STROUD,I.D.KUNTZ REMARK 1 TITL STRUCTURAL STUDIES OF ALPHA-BUNGAROTOXIN. 1. REMARK 1 TITL 2 SEQUENCE-SPECIFIC 1H NMR RESONANCE ASSIGNMENTS REMARK 1 REF BIOCHEMISTRY V. 27 2763 1988 REMARK 1 REFN ISSN 0006-2960

REMARK 2 REMARK 2 RESOLUTION. NOT APPLICABLE.

REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : VEMBED, GROMOS-87 REMARK 3 AUTHORS : KUNTZ (VEMBED), VAN GUNSTEREN (GROMOS-87) REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NOE DATA CAME FROM SPECTRA COLLECTED REMARK 3 AT 35 DEGREES AND AT 25 DEGREES CELSIUS, PH 5.8. A LIST OF ALL REMARK 3 NMR CONSTRAINTS WAS DEPOSITED IN THE PROTEIN DATA BANK REMARK 3 TOGETHER WITH THE STRUCTURE LIST. THESE CONSTRAINTS CONSISTED REMARK 3 OF 365 INTRAMOLECULAR CONSTRAINTS (146 LONG-RANGE, 155 REMARK 3 SEQUENTIAL AND 64 DIHEDRAL ANGLES), AND 24 INTERMOLECULAR REMARK 3 CONSTRAINTS BETWEEN THE 74 RESIDUES OF BGTX AND THE FIRST 6 REMARK 3 RESIDUES OF THE 12 RESIDUE PEPTIDE FRAGMENT OF NACHR USED IN REMARK 3 THIS STUDY (LISTED HERE AS RESIDUES 75 B - 80 B). THE REMARK 3 COORDINATES THAT FOLLOW ARE IN FOUR SEPARATE MODELS. THE 12 REMARK 3 RESIDUE PEPTIDE FRAGMENT OF NACHR HAS BEEN MODELED FOR ONLY REMARK 3 THE FIRST SIX RESIDUES AND HAS BEEN NUMBERED AS A CONTINUATION REMARK 3 OF THE NUMBERS FOR THE BGTX PORTION OF THE COMPLEX AND GIVEN REMARK 3 THE CHAIN IDENTIFIER 'B', AFTER THE TER ENTRY SEPARATING THE REMARK 3 COORDINATES OF THE TWO COMPONENTS OF THE COMPLEX. THE AVERAGE REMARK 3 RMS DEVIATION OF THE BACKBONE ATOMS, WHEN MATCHED IN A REMARK 3 PAIRWISE MANNER, IS 2.6 ANGSTROMS, WITH THE POORLY DEFINED REMARK 3 REGIONS OF RESIDUES 30 A - 38 A, AND 69 A - 74 A OF BGTX REMARK 3 EXCLUDED. RESTRAINT VIOLATIONS: VIOLATIONS WERE CATEGORIZED REMARK 3 ACCORDING TO SIZE. THE TOTAL NUMBER OF VIOLATIONS IN EACH REMARK 3 CATEGORY WAS ADDED, AND THAT NUMBER DIVIDED BY 4 TO DETERMINE REMARK 3 THE AVERAGE NUMBER OF VIOLATIONS PER STRUCTURE FOR EACH REMARK 3 CATEGORY. VIOLATION RANGE AVERAGE NUMBER OF VIOLATIONS REMARK 3 (ANGSTROMS) VIOLATION >0.7 5.0 0.7>=VIOLATION >0.6 6.0 0.6>= REMARK 3 VIOLATION >0.5 5.75 0.5>=VIOLATION >0.4 9.5 0.4>=VIOLATION > REMARK 3 0.3 17.0 0.3>=VIOLATION >0.2 16.5 0.2>=VIOLATION >0.1 18.0. TO REMARK 3 SIMPLIFY THE CALCULATIONS, ONLY THE FIRST SIX AMINO ACIDS (185 REMARK 3 - 190) OF THE DODECAPEPTIDE WERE INCORPORATED INTO THE REMARK 3 STRUCTURE OF THE COMPLEX. THIS WAS APPROPRIATE AS NO REMARK 3 INTERMOLECULAR NOE'S AND NO LONG-RANGE INTRAMOLECULAR NOE'S REMARK 3 WERE ASSIGNED INVOLVING PEPTIDE RESIDUES 191 - 196. THE REMARK 3 COORDINATES ARE PRESENTED IN FOUR SEPARATE MODELS, WITH TER REMARK 3 STATEMENTS TO SEPARATE THE BGTX PART OF THE COMPLEX FROM THE REMARK 3 NACHR PORTION OF THE COMPLEX. ALL STRUCTURES WERE MATCHED IN REMARK 3 CARTESIAN SPACE SUCH THAT THE RMSD BETWEEN THEM WAS MINIMIZED, REMARK 3 WITH THE EXCLUSION OF RESIDUES 30 A - 38 A, AND 69 A - 74 A OF REMARK 3 BGTX.

REMARK 4 REMARK 4 1ABT COMPLIES WITH FORMAT V. 3.15, 01-DEC-08

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY BNL.

REMARK 210 REMARK 210 EXPERIMENTAL DETAILS REMARK 210 EXPERIMENT TYPE : NMR REMARK 210 TEMPERATURE (KELVIN) : NULL REMARK 210 PH : NULL REMARK 210 IONIC STRENGTH : NULL REMARK 210 PRESSURE : NULL REMARK 210 SAMPLE CONTENTS : NULL REMARK 210 REMARK 210 NMR EXPERIMENTS CONDUCTED : NULL REMARK 210 SPECTROMETER FIELD STRENGTH : NULL REMARK 210 SPECTROMETER MODEL : NULL REMARK 210 SPECTROMETER MANUFACTURER : NULL REMARK 210 REMARK 210 STRUCTURE DETERMINATION. REMARK 210 SOFTWARE USED : NULL REMARK 210 METHOD USED : NULL REMARK 210 REMARK 210 CONFORMERS, NUMBER CALCULATED : NULL REMARK 210 CONFORMERS, NUMBER SUBMITTED : 4 REMARK 210 CONFORMERS, SELECTION CRITERIA : NULL REMARK 210 REMARK 210 BEST REPRESENTATIVE CONFORMER IN THIS ENSEMBLE : NULL REMARK 210 REMARK 210 REMARK: NULL

REMARK 215 REMARK 215 NMR STUDY REMARK 215 THE COORDINATES IN THIS ENTRY WERE GENERATED FROM SOLUTION REMARK 215 NMR DATA. PROTEIN DATA BANK CONVENTIONS REQUIRE THAT REMARK 215 CRYST1 AND SCALE RECORDS BE INCLUDED, BUT THE VALUES ON REMARK 215 THESE RECORDS ARE MEANINGLESS.

REMARK 465 REMARK 465 MISSING RESIDUES REMARK 465 THE FOLLOWING RESIDUES WERE NOT LOCATED IN THE REMARK 465 EXPERIMENT. (RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 465 SSSEQ=SEQUENCE NUMBER; I=INSERTION CODE.) REMARK 465 MODELS 1-4 REMARK 465 RES C SSSEQI REMARK 465 THR B 81 REMARK 465 CYS B 82 REMARK 465 CYS B 83 REMARK 465 PRO B 84 REMARK 465 ASP B 85 REMARK 465 THR B 86

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 1 TYR A 24 N - CA - C ANGL. DEV. = 16.6 DEGREES REMARK 500 2 TYR A 24 CB - CG - CD2 ANGL. DEV. = -4.8 DEGREES REMARK 500 2 ARG A 25 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 2 TYR B 79 CB - CG - CD2 ANGL. DEV. = -3.7 DEGREES REMARK 500 3 ARG A 25 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 3 TYR A 54 CB - CG - CD2 ANGL. DEV. = -3.9 DEGREES REMARK 500 3 TYR B 79 CB - CG - CD2 ANGL. DEV. = -5.3 DEGREES REMARK 500 4 TYR A 24 CA - CB - CG ANGL. DEV. = 12.5 DEGREES REMARK 500 4 TYR A 24 CB - CG - CD2 ANGL. DEV. = -6.2 DEGREES REMARK 500 4 TYR A 24 CB - CG - CD1 ANGL. DEV. = 4.3 DEGREES REMARK 500 4 ARG A 25 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 4 TYR B 79 CB - CG - CD2 ANGL. DEV. = -5.2 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 1 CYS A 3 -138.70 -131.50 REMARK 500 1 ALA A 13 81.59 -68.85 REMARK 500 1 THR A 15 94.43 -69.73 REMARK 500 1 GLU A 20 -163.54 -119.26 REMARK 500 1 ASN A 21 13.90 -65.75 REMARK 500 1 TYR A 24 -84.80 -18.63 REMARK 500 1 ARG A 25 82.64 -2.20 REMARK 500 1 TRP A 28 -156.55 -146.34 REMARK 500 1 CYS A 29 116.38 -25.34 REMARK 500 1 ASP A 30 87.68 72.36 REMARK 500 1 PHE A 32 43.71 23.10 REMARK 500 1 CYS A 33 51.78 26.40 REMARK 500 1 SER A 34 -90.85 -166.74 REMARK 500 1 ARG A 36 100.85 70.41 REMARK 500 1 VAL A 39 95.62 -67.13 REMARK 500 1 PRO A 53 108.82 -59.40 REMARK 500 1 TYR A 54 88.74 -64.76 REMARK 500 1 SER A 61 -73.50 -79.23 REMARK 500 1 ASP A 63 76.38 71.97 REMARK 500 1 LYS A 64 -76.00 59.55 REMARK 500 1 CYS A 65 -64.20 56.64 REMARK 500 1 HIS A 68 -66.78 -18.45 REMARK 500 1 PRO A 69 -178.35 -66.47 REMARK 500 1 GLN A 71 75.33 -66.03 REMARK 500 2 CYS A 3 -124.05 -169.87 REMARK 500 2 THR A 6 -77.24 55.67 REMARK 500 2 ALA A 7 -80.63 -0.58 REMARK 500 2 THR A 8 37.19 -78.39 REMARK 500 2 PRO A 10 79.21 -69.23 REMARK 500 2 ILE A 11 114.83 65.30 REMARK 500 2 THR A 15 109.40 -57.42 REMARK 500 2 GLU A 20 53.12 20.15 REMARK 500 2 LYS A 26 -161.81 179.76 REMARK 500 2 ALA A 31 -53.70 72.56 REMARK 500 2 PHE A 32 -98.46 -49.63 REMARK 500 2 CYS A 33 -78.55 62.97 REMARK 500 2 ARG A 36 105.77 63.23 REMARK 500 2 LYS A 38 82.73 51.10 REMARK 500 2 GLU A 41 -167.68 -165.76 REMARK 500 2 LEU A 42 164.29 179.36 REMARK 500 2 ALA A 46 5.62 -62.44 REMARK 500 2 PRO A 49 88.51 -66.59 REMARK 500 2 LYS A 51 -5.24 84.40 REMARK 500 2 PRO A 53 106.95 -54.18 REMARK 500 2 TYR A 54 88.71 -65.88 REMARK 500 2 ASP A 63 -160.45 46.44 REMARK 500 2 LYS A 64 58.24 -67.74 REMARK 500 2 LYS A 70 -77.37 -28.56 REMARK 500 2 GLN A 71 -37.59 56.50 REMARK 500 2 TYR B 79 61.72 -100.30 REMARK 500 3 THR A 6 13.92 54.86 REMARK 500 3 THR A 8 -159.83 -171.65 REMARK 500 3 PRO A 10 89.38 -17.20 REMARK 500 3 ILE A 11 66.41 62.78 REMARK 500 3 VAL A 14 -86.65 -119.63 REMARK 500 3 GLU A 20 -59.11 81.07 REMARK 500 3 TRP A 28 -125.28 -137.88 REMARK 500 3 ASP A 30 -78.46 5.11 REMARK 500 3 PHE A 32 -26.55 56.13 REMARK 500 3 CYS A 33 -7.03 85.29 REMARK 500 3 SER A 35 -116.03 -123.11 REMARK 500 3 PRO A 49 87.37 -63.54 REMARK 500 3 GLU A 55 -102.14 54.54 REMARK 500 3 THR A 62 -70.71 73.05 REMARK 500 3 LYS A 64 82.25 -47.80 REMARK 500 3 CYS A 65 -88.24 -115.64 REMARK 500 3 ASN A 66 85.36 -51.92 REMARK 500 3 HIS A 68 -68.17 86.70 REMARK 500 3 PRO A 69 99.16 -48.74 REMARK 500 3 TRP B 77 100.93 52.93 REMARK 500 4 HIS A 4 89.40 -18.89 REMARK 500 4 THR A 6 25.70 32.08 REMARK 500 4 ILE A 11 107.18 -22.29 REMARK 500 4 THR A 15 95.02 -68.50 REMARK 500 4 LEU A 22 -108.02 22.91 REMARK 500 4 TYR A 24 126.84 -16.29 REMARK 500 4 ARG A 25 -51.72 177.59 REMARK 500 4 LYS A 26 -165.14 119.73 REMARK 500 4 ASP A 30 39.76 -77.35 REMARK 500 4 ALA A 31 -49.14 60.86 REMARK 500 4 CYS A 33 -28.74 71.53 REMARK 500 4 SER A 35 -50.25 70.07 REMARK 500 4 LYS A 38 101.79 -59.93 REMARK 500 4 GLU A 41 -22.48 58.75 REMARK 500 4 ALA A 45 -54.53 68.79 REMARK 500 4 THR A 47 112.41 50.58 REMARK 500 4 LYS A 51 -23.64 71.85 REMARK 500 4 GLU A 55 -134.84 78.05 REMARK 500 4 LYS A 64 7.38 51.40 REMARK 500 4 ASN A 66 55.92 -118.96 REMARK 500 4 PRO A 69 83.69 -67.76 REMARK 500 4 LYS A 70 -79.91 3.82 REMARK 500 4 GLN A 71 -53.26 62.00 REMARK 500 4 PRO A 73 86.08 -66.10 REMARK 500 4 HIS B 76 104.14 -31.50 REMARK 500 4 VAL B 78 38.32 -72.44 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: NON-CIS, NON-TRANS REMARK 500 REMARK 500 THE FOLLOWING PEPTIDE BONDS DEVIATE SIGNIFICANTLY FROM BOTH REMARK 500 CIS AND TRANS CONFORMATION. CIS BONDS, IF ANY, ARE LISTED REMARK 500 ON CISPEP RECORDS. TRANS IS DEFINED AS 180 +/- 30 AND REMARK 500 CIS IS DEFINED AS 0 +/- 30 DEGREES. REMARK 500 MODEL OMEGA REMARK 500 TYR A 24 ARG A 25 1 -131.03 REMARK 500 GLU A 41 LEU A 42 2 134.97 REMARK 500 LYS A 38 VAL A 39 3 145.32 REMARK 500 VAL A 39 VAL A 40 4 -149.67 REMARK 500 VAL A 40 GLU A 41 4 128.73 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: PLANAR GROUPS REMARK 500 REMARK 500 PLANAR GROUPS IN THE FOLLOWING RESIDUES HAVE A TOTAL REMARK 500 RMS DISTANCE OF ALL ATOMS FROM THE BEST-FIT PLANE REMARK 500 BY MORE THAN AN EXPECTED VALUE OF 6*RMSD, WITH AN REMARK 500 RMSD 0.02 ANGSTROMS, OR AT LEAST ONE ATOM HAS REMARK 500 AN RMSD GREATER THAN THIS VALUE REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 M RES CSSEQI RMS TYPE REMARK 500 1 HIS A 4 0.16 SIDE_CHAIN REMARK 500 1 TYR A 24 0.15 SIDE_CHAIN REMARK 500 1 PHE A 32 0.08 SIDE_CHAIN REMARK 500 1 TYR A 54 0.10 SIDE_CHAIN REMARK 500 1 HIS A 68 0.14 SIDE_CHAIN REMARK 500 1 TYR B 80 0.07 SIDE_CHAIN REMARK 500 2 TYR A 24 0.15 SIDE_CHAIN REMARK 500 2 TYR B 79 0.09 SIDE_CHAIN REMARK 500 3 TYR A 24 0.07 SIDE_CHAIN REMARK 500 3 TYR B 79 0.19 SIDE_CHAIN REMARK 500 3 TYR B 80 0.07 SIDE_CHAIN REMARK 500 4 ARG A 36 0.07 SIDE_CHAIN REMARK 500 4 HIS A 68 0.10 SIDE_CHAIN REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: MAIN CHAIN PLANARITY REMARK 500 REMARK 500 THE FOLLOWING RESIDUES HAVE A PSEUDO PLANARITY REMARK 500 TORSION, C(I) - CA(I) - N(I+1) - O(I), GREATER REMARK 500 10.0 DEGREES. (M=MODEL NUMBER; RES=RESIDUE NAME; REMARK 500 C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; REMARK 500 I=INSERTION CODE). REMARK 500 REMARK 500 M RES CSSEQI ANGLE REMARK 500 1 GLU A 56 11.41 REMARK 500 3 HIS A 4 10.34 REMARK 500 3 THR A 5 11.03 REMARK 500 3 ALA A 7 -10.34 REMARK 500 3 SER A 12 10.34 REMARK 500 3 TYR A 24 10.32 REMARK 500 3 ARG A 36 11.42 REMARK 500 3 LYS A 38 15.60 REMARK 500 3 PRO A 49 10.99 REMARK 500 3 LYS A 51 -10.60 REMARK 500 3 CYS A 65 -12.44 REMARK 500 4 VAL A 40 11.33 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: CHIRAL CENTERS REMARK 500 REMARK 500 UNEXPECTED CONFIGURATION OF THE FOLLOWING CHIRAL REMARK 500 CENTER(S) USING IMPROPER CA--C--CB--N CHIRALITY REMARK 500 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: (11X,I3,1X,A3,1X,A1,I4,A1,6X,F5.1,6X,A1,10X,A1,3X,A16) REMARK 500 REMARK 500 M RES CSSEQI IMPROPER EXPECTED FOUND DETAILS REMARK 500 1 TYR A 24 23.6 L L OUTSIDE RANGE REMARK 500 1 CYS A 33 23.4 L L OUTSIDE RANGE REMARK 500 1 ARG A 36 22.0 L L OUTSIDE RANGE REMARK 500 2 LYS A 26 23.0 L L OUTSIDE RANGE REMARK 500 2 LEU A 42 23.7 L L OUTSIDE RANGE REMARK 500 2 GLN A 71 23.0 L L OUTSIDE RANGE REMARK 500 3 PHE A 32 22.7 L L OUTSIDE RANGE REMARK 500 3 LYS A 52 24.2 L L OUTSIDE RANGE REMARK 500 3 HIS A 68 23.5 L L OUTSIDE RANGE REMARK 500 4 LYS A 26 23.0 L L OUTSIDE RANGE REMARK 500 4 ALA A 45 24.5 L L OUTSIDE RANGE REMARK 500 REMARK 500 REMARK: NULL

DBREF 1ABT A 1 74 UNP P60615 NXL1A_BUNMU 1 74 DBREF 1ABT B 75 86 UNP P02710 ACHA_TORCA 209 220

SEQRES 1 A 74 ILE VAL CYS HIS THR THR ALA THR SER PRO ILE SER ALA SEQRES 2 A 74 VAL THR CYS PRO PRO GLY GLU ASN LEU CYS TYR ARG LYS SEQRES 3 A 74 MET TRP CYS ASP ALA PHE CYS SER SER ARG GLY LYS VAL SEQRES 4 A 74 VAL GLU LEU GLY CYS ALA ALA THR CYS PRO SER LYS LYS SEQRES 5 A 74 PRO TYR GLU GLU VAL THR CYS CYS SER THR ASP LYS CYS SEQRES 6 A 74 ASN PRO HIS PRO LYS GLN ARG PRO GLY SEQRES 1 B 12 LYS HIS TRP VAL TYR TYR THR CYS CYS PRO ASP THR

HELIX 1 1 ASP A 30 SER A 34 5 5

SHEET 1 S1 2 ILE A 1 THR A 5 0 SHEET 2 S1 2 SER A 12 CYS A 16 -1 O SER A 12 N THR A 5 SHEET 1 S2 3 VAL A 39 ALA A 45 0 SHEET 2 S2 3 LEU A 22 TRP A 28 -1 N LEU A 22 O ALA A 45 SHEET 3 S2 3 GLU A 56 CYS A 60 -1 O GLU A 56 N MET A 27

SSBOND 1 CYS A 3 CYS A 23 1555 1555 2.03 SSBOND 2 CYS A 16 CYS A 44 1555 1555 2.04 SSBOND 3 CYS A 29 CYS A 33 1555 1555 2.04 SSBOND 4 CYS A 48 CYS A 59 1555 1555 2.04 SSBOND 5 CYS A 60 CYS A 65 1555 1555 2.04

CISPEP 1 CYS A 29 ASP A 30 1 17.57 CISPEP 2 TYR A 24 ARG A 25 4 9.57

CRYST1 1.000 1.000 1.000 90.00 90.00 90.00 P 1 1

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 1.000000 0.000000 0.000000 0.00000

SCALE2 0.000000 1.000000 0.000000 0.00000

SCALE3 0.000000 0.000000 1.000000 0.00000