1w6b
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(New page: 200px<br /><applet load="1w6b" size="450" color="white" frame="true" align="right" spinBox="true" caption="1w6b" /> '''SOLUTION NMR STRUCTURE OF A LONG NEUROTOXIN ...)
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Revision as of 03:07, 21 November 2007
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SOLUTION NMR STRUCTURE OF A LONG NEUROTOXIN FROM THE VENOM OF THE ASIAN COBRA, 20 STRUCTURES
Overview
The NMR solution structures of NTX-1 (PDB code 1W6B and BMRB 6288), a long, neurotoxin isolated from the venom of Naja naja oxiana, and the molecular, dynamics simulation of these structures are reported. Calculations are, based on 1114 NOEs, 19 hydrogen bonds, 19 dihedral angle restraints and, secondary chemical shifts derived from 1H to 13C HSQC spectrum. Similar to, other long neurotoxins, the three-finger like structure shows a double and, a triple stranded beta-sheet as well as some flexible regions, particularly at the tip of loop II and the C-terminal tail. The solution, NMR and molecular dynamics simulated structures are in good agreement with, root mean square deviation values of 0.23 and 1 A for residues involved in, beta-sheet regions, respectively. The overall fold in the NMR structure is, similar to that of the X-ray crystallography, although some differences, exist in loop I and the tip of loop II. The most functionally important, residues are located at the tip of loop II and it appears that the, mobility and the local structure in this region modulate the binding of, NTX-1 and other long neurotoxins to the nicotinic acetylcholine receptor.
About this Structure
1W6B is a Single protein structure of sequence from Naja oxiana. Full crystallographic information is available from OCA.
Reference
Solution structure of long neurotoxin NTX-1 from the venom of Naja naja oxiana by 2D-NMR spectroscopy., Talebzadeh-Farooji M, Amininasab M, Elmi MM, Naderi-Manesh H, Sarbolouki MN, Eur J Biochem. 2004 Dec;271(23-24):4950-7. PMID:15606783
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