1N8M - Header Asymmetric Unit

HEADER TOXIN 21-NOV-02 1N8M

TITLE SOLUTION STRUCTURE OF PI4, A FOUR DISULFIDE BRIDGED TITLE 2 SCORPION TOXIN ACTIVE ON POTASSIUM CHANNELS

COMPND MOL_ID: 1; COMPND 2 MOLECULE: POTASSIUM CHANNEL BLOCKING TOXIN 4; COMPND 3 CHAIN: A; COMPND 4 SYNONYM: PI4; COMPND 5 ENGINEERED: YES

SOURCE MOL_ID: 1; SOURCE 2 SYNTHETIC: YES; SOURCE 3 OTHER_DETAILS: THIS SEQUENCE OCCURS NATURALLY IN THE VENOM SOURCE 4 OF PANDINUS IMPERATOR SCORPIONS, WITH AN AMIDATED C- SOURCE 5 TERMINUS. IT WAS ESTABLISHED BY NMR THAT THE STRUCTURE OF SOURCE 6 THE NATURAL TOXIN EXTRACTED FROM SCORPION VENOM IS SOURCE 7 EFFECTIVELY IDENTICAL TO THE STRUCTURE OF THE SYNTHETIC SOURCE 8 TOXIN, WHICH HAS A CARBOXYLATED C-TERMINUS.

KEYWDS POTASSIUM CHANNEL BLOCKER, DISULFIDE BRIDGE STABILIZED KEYWDS 2 ALPHA BETA MOTIF, TOXIN

EXPDTA SOLUTION NMR

NUMMDL 10

AUTHOR J.I.GUIJARRO,S.M'BAREK,T.OLAMENDI-PORTUGAL,F.GOMEZ-LAGUNAS, AUTHOR 2 D.GARNIER,H.ROCHAT,L.D.POSSANI,J.M.SABATIER,M.DELEPIERRE

REVDAT 2 24-FEB-09 1N8M 1 VERSN REVDAT 1 02-SEP-03 1N8M 0

JRNL AUTH J.I.GUIJARRO,S.M'BAREK,F.GOMEZ-LAGUNAS,D.GARNIER, JRNL AUTH 2 H.ROCHAT,J.M.SABATIER,L.D.POSSANI,M.DELEPIERRE JRNL TITL SOLUTION STRUCTURE OF PI4, A SHORT JRNL TITL 2 FOUR-DISULFIDE-BRIDGED SCORPION TOXIN SPECIFIC OF JRNL TITL 3 POTASSIUM CHANNELS. JRNL REF PROTEIN SCI. V. 12 1844 2003 JRNL REFN ISSN 0961-8368 JRNL PMID 12930984 JRNL DOI 10.1110/PS.03186703

REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH T.OLAMENDI-PORTUGAL,F.GOMEZ-LAGUNAS,G.B.GURROLA, REMARK 1 AUTH 2 L.D.POSSANI REMARK 1 TITL TWO SIMILAR PEPTIDES FROM THE VENOM OF THE REMARK 1 TITL 2 SCORPION PANDINUS IMPERATOR, ONE HIGHLY EFFECTIVE REMARK 1 TITL 3 BLOCKER AND THE OTHER INACTIVE ON K+ CHANNELS REMARK 1 REF TOXICON V. 36 759 1998 REMARK 1 REFN ISSN 0041-0101 REMARK 1 DOI 10.1016/S0041-0101(97)00163-3

REMARK 2 REMARK 2 RESOLUTION. NOT APPLICABLE.

REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : CNS 1.1 REMARK 3 AUTHORS : BRUNGER REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: STRUCTURES ARE BASED ON A TOTAL OF REMARK 3 705 CONSTRAINTS, 679 ARE MEANINGFUL NOE DERIVED CONSTRAINTS REMARK 3 (642 UNAMBIGUOUS, 37 AMBIGUOUS), 16 ARE DIHEDRAL (PHI) ANGLE REMARK 3 CONSTRAINTS AND 10 ARE HYDROGEN BONDS. THE FOUR DISULFIDE REMARK 3 BRIDGES (CYS 6-27, 12-32, 16-34, 22-37) WERE INCLUDED IN THE REMARK 3 TOPOLOGY FILE USED FOR THE CALCULATIONS.

REMARK 4 REMARK 4 1N8M COMPLIES WITH FORMAT V. 3.15, 01-DEC-08

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 10-DEC-02. REMARK 100 THE RCSB ID CODE IS RCSB017655.

REMARK 210 REMARK 210 EXPERIMENTAL DETAILS REMARK 210 EXPERIMENT TYPE : NMR REMARK 210 TEMPERATURE (KELVIN) : 303 REMARK 210 PH : 4.0 REMARK 210 IONIC STRENGTH : 5 REMARK 210 PRESSURE : AMBIENT REMARK 210 SAMPLE CONTENTS : 2.5 MM PI4, 5 MM CD3COONA, PH REMARK 210 4.0, 10% D2O; 3.2 MM PI4, 5 MM REMARK 210 CD3COONA, PD 4.0, 100% D2O REMARK 210 REMARK 210 NMR EXPERIMENTS CONDUCTED : 2D NOESY, P-COSY REMARK 210 SPECTROMETER FIELD STRENGTH : 500 MHZ REMARK 210 SPECTROMETER MODEL : INOVA REMARK 210 SPECTROMETER MANUFACTURER : VARIAN REMARK 210 REMARK 210 STRUCTURE DETERMINATION. REMARK 210 SOFTWARE USED : VNMR 6.1C, NMRVIEW 5.03, ARIA REMARK 210 1.2, CNS 1.1 REMARK 210 METHOD USED : TORSION ANGLE DYNAMICS REMARK 210 REMARK 210 CONFORMERS, NUMBER CALCULATED : 20 REMARK 210 CONFORMERS, NUMBER SUBMITTED : 10 REMARK 210 CONFORMERS, SELECTION CRITERIA : STRUCTURES WITH THE LOWEST REMARK 210 ENERGY REMARK 210 REMARK 210 BEST REPRESENTATIVE CONFORMER IN THIS ENSEMBLE : 1 REMARK 210 REMARK 210 REMARK: DISULFIDE BRIDGES WERE DETERMINED BY NMR AND BY N- REMARK 210 TERMINAL SEQUENCING OF PROTEOLYSIS PEPTIDES. DISTANCE REMARK 210 CONSTRAINTS WERE DERIVED FROM INITIAL NOE BUILD UP RATES USING REMARK 210 2D NOESY EXPERIMENTS WITH MIXING TIMES OF 70, 100, 150, 200 REMARK 210 AND 250 MS IN H2O AND D2O.

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 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 ASN A 24 104.58 -54.74 REMARK 500 1 CYS A 37 69.02 -117.69 REMARK 500 2 ALA A 3 77.64 51.45 REMARK 500 2 CYS A 34 98.19 -69.00 REMARK 500 2 CYS A 37 54.30 -93.45 REMARK 500 3 GLU A 2 48.00 -108.47 REMARK 500 3 ALA A 3 76.36 56.21 REMARK 500 3 ASN A 24 96.25 -66.28 REMARK 500 4 ASN A 24 98.75 -61.66 REMARK 500 5 ASN A 24 100.84 -58.01 REMARK 500 6 ASN A 24 99.37 -62.05 REMARK 500 8 ALA A 3 76.18 52.43 REMARK 500 10 ASN A 24 98.46 -63.63 REMARK 500 REMARK 500 REMARK: NULL

DBREF 1N8M A 1 38 UNP P58498 SCK4_PANIM 1 38

SEQRES 1 A 38 ILE GLU ALA ILE ARG CYS GLY GLY SER ARG ASP CYS TYR SEQRES 2 A 38 ARG PRO CYS GLN LYS ARG THR GLY CYS PRO ASN ALA LYS SEQRES 3 A 38 CYS ILE ASN LYS THR CYS LYS CYS TYR GLY CYS SER

HELIX 1 1 SER A 9 GLY A 21 1 13

SHEET 1 A 2 ALA A 25 ILE A 28 0 SHEET 2 A 2 THR A 31 CYS A 34 -1 O LYS A 33 N LYS A 26

SSBOND 1 CYS A 6 CYS A 27 1555 1555 2.03 SSBOND 2 CYS A 12 CYS A 32 1555 1555 2.03 SSBOND 3 CYS A 16 CYS A 34 1555 1555 2.02 SSBOND 4 CYS A 22 CYS A 37 1555 1555 2.03

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