2B3C

SOLUTION STRUCTURE OF A BETA-NEUROTOXIN FROM THE NEW WORLD SCORPION CENTRUROIDES SCULPTURATUS EWING

2B3C の概要

• エントリーDOI: 10.2210/pdb2b3c/pdb
• 分子名称: PROTEIN (NEUROTOXIN CSE-I) (1 entity in total)
• 機能のキーワード: scorpion neurotoxin, beta-toxin, new world toxin, toxin
• 由来する生物種: Centruroides sculpturatus (bark scorpion)
• 細胞内の位置: Secreted: P01491
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 7299.31

構造登録者

Jablonsky, M.J.,Jackson, P.L.,Trent, J.O.,Watt, D.D.,Krishna, N.R. (登録日: 1998-12-09, 公開日: 1998-12-16, 最終更新日: 2024-10-30)

主引用文献

Jablonsky, M.J.,Jackson, P.L.,Trent, J.O.,Watt, D.D.,Krishna, N.R.
Solution structure of a beta-neurotoxin from the New World scorpion Centruroides sculpturatus Ewing.
Biochem.Biophys.Res.Commun., 254:406-412, 1999

PubMed Abstract: We report the detailed solution structure of the 7.2 kDa protein CsE-I, a beta-neurotoxin from the New World scorpion Centruroides sculpturatus Ewing. This toxin binds to sodium channels, but unlike the alpha-neurotoxins, shifts the voltage of activation toward more negative potentials causing the membrane to fire spontaneously. Sequence-specific proton NMR assignments were made using 600 MHz 2D-NMR data. Distance geometry and dynamical simulated annealing refinements were performed using experimental distance and torsion angle constraints from NOESY and pH-COSY data. A family of 40 structures without constraint violations was generated, and an energy-minimized average structure was computed. The backbone conformation of the CsE-I toxin shows similar secondary structural features as the prototypical alpha-neurotoxin, CsE-v3, and is characterized by a short 2(1/2)-turn alpha-helix and a 3-strand antiparallel beta-sheet, both held together by disulfide bridges. The RMSD for the backbone atoms between CsE-I and CsE-v3 is 1.48 A. Despite this similarity in the overall backbone folding, the these two proteins show some important differences in the primary structure (sequence) and electrostatic potential surfaces. Our studies provide a basis for unravelling the role of these differences in relation to the known differences in the receptor sites on the voltage sensitive sodium channel for the alpha- and beta-neurotoxins.

PubMed: 9918851
DOI: 10.1006/bbrc.1998.9904

実験手法

SOLUTION NMR