1vb0

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Revision as of 02:26, 21 November 2007

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spinqualitylabelsall models 1vb0, resolution 0.92Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Atomic resolution structure of atratoxin-b, one short-chain neurotoxin from Naja atra

Overview

By using single wavelength anomalous diffraction phasing based on the, anomalous signal from copper atoms, the crystal structure of atratoxin was, determined at the resolution of 1.5 A and was refined to an ultrahigh, resolution of 0.87 A. The ultrahigh resolution electron density maps, allowed the modeling of 38 amino acid residues in alternate conformations, and the location of 322 of 870 possible hydrogen atoms. To get accurate, information at the atomic level, atratoxin-b (an analog of atratoxin with, reduced toxicity) was also refined to an atomic resolution of 0.92 A. By, the sequence and structural comparison of these two atratoxins, Arg(33), and Arg(36) were identified to be critical to their varied toxicity. The, effect of copper ions on the distribution of hydrogen atoms in atratoxin, was discussed, and the interactions between copper ions and protein, residues were analyzed based on a statistical method, revealing a novel, pentahedral copper-binding motif.

About this Structure

1VB0 is a Single protein structure of sequence from Naja atra with SO4 and TRS as ligands. Full crystallographic information is available from OCA.

Reference

The atomic resolution crystal structure of atratoxin determined by single wavelength anomalous diffraction phasing., Lou X, Liu Q, Tu X, Wang J, Teng M, Niu L, Schuller DJ, Huang Q, Hao Q, J Biol Chem. 2004 Sep 10;279(37):39094-104. Epub 2004 Jul 12. PMID:15252034

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