2ca7

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Revision as of 06:56, 21 November 2007

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CONKUNITZIN-S1 IS THE FIRST MEMBER OF A NEW KUNITZ-TYPE NEUROTOXIN FAMILY- STRUCTURAL AND FUNCTIONAL CHARACTERIZATION

Overview

Conkunitzin-S1 (Conk-S1) is a 60-residue neurotoxin from the venom of the, cone snail Conus striatus that interacts with voltage-gated potassium, channels. Conk-S1 shares sequence homology with Kunitz-type proteins but, contains only two out of the three highly conserved cysteine bridges, which are typically found in these small, basic protein modules. In this, study the three-dimensional structure of Conk-S1 has been solved by, multidimensional NMR spectroscopy. The solution structure of recombinant, Conk-S1 shows that a Kunitz fold is present, even though one of the highly, conserved disulfide cross-links is missing. Introduction of a third, homologous disulfide bond into Conk-S1 results in a functional toxin with, similar affinity for Shaker potassium channels. The affinity of Conk-S1, can be enhanced by a pore mutation within the Shaker channel pore, indicating an interaction of Conk-S1 with the vestibule of potassium, channels.

About this Structure

2CA7 is a Single protein structure of sequence from Conus striatus. Full crystallographic information is available from OCA.

Reference

Conkunitzin-S1 is the first member of a new Kunitz-type neurotoxin family. Structural and functional characterization., Bayrhuber M, Vijayan V, Ferber M, Graf R, Korukottu J, Imperial J, Garrett JE, Olivera BM, Terlau H, Zweckstetter M, Becker S, J Biol Chem. 2005 Jun 24;280(25):23766-70. Epub 2005 Apr 15. PMID:15833744

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