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1lqi

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{{STRUCTURE_1lqi| PDB=1lqi | SCENE= }}
{{STRUCTURE_1lqi| PDB=1lqi | SCENE= }}
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'''INSECTICIDAL ALPHA SCORPION TOXIN ISOLATED FROM THE VENOM OF SCORPION LEIURUS QUINQUESTRIATUS HEBRAEUS, NMR, 29 STRUCTURES'''
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===INSECTICIDAL ALPHA SCORPION TOXIN ISOLATED FROM THE VENOM OF SCORPION LEIURUS QUINQUESTRIATUS HEBRAEUS, NMR, 29 STRUCTURES===
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==Overview==
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The solution structure of a recombinant active alpha-neurotoxin from Leiurus quinquestriatus hebraeus, Lqh(alpha)IT, was determined by proton two-dimensional nuclear magnetic resonance spectroscopy (2D NMR). This toxin is the most insecticidal among scorpion alpha-neurotoxins and, therefore, serves as a model for clarifying the structural basis for their biological activity and selective toxicity. A set of 29 structures was generated without constraint violations exceeding 0.4 A. These structures had root mean square deviations of 0.49 and 1.00 A with respect to the average structure for backbone atoms and all heavy atoms, respectively. Similarly to other scorpion toxins, the structure of Lqh(alpha)IT consists of an alpha-helix, a three-strand antiparallel beta-sheet, three type I tight turns, a five-residue turn, and a hydrophobic patch that includes tyrosine and tryptophan rings in a "herringbone" arrangement. Positive phi angles were found for Ala50 and Asn11, suggesting their proximity to functionally important regions of the molecule. The sample exhibited conformational heterogeneity over a wide range of experimental conditions, and two conformations were observed for the majority of protein residues. The ratio between these conformations was temperature-dependent, and the rate of their interconversions was estimated to be on the order of 1-5 s(-1) at 308 K. The conformation of the polypeptide backbone of Lqh(alpha)IT is very similar to that of the most active antimammalian scorpion alpha-toxin, AaHII, from Androctonus australis Hector (60% amino acid sequence homology). Yet, several important differences were observed at the 5-residue turn comprising residues Lys8-Cys12, the C-terminal segment, and the mutual disposition of these two regions. 2D NMR studies of the R64H mutant, which is 3 times more toxic than the unmodified Lqh(alpha)IT, demonstrated the importance of the spatial orientation of the last residue side chain for toxicity of Lqh(alpha)IT.
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{{ABSTRACT_PUBMED_9054546}}
==About this Structure==
==About this Structure==
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1LQI is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Leiurus_quinquestriatus_hebraeus Leiurus quinquestriatus hebraeus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LQI OCA].
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1LQI is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Leiurus_quinquestriatus_hebraeus Leiurus quinquestriatus hebraeus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LQI OCA].
==Reference==
==Reference==
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[[Category: Signal]]
[[Category: Signal]]
[[Category: Sodium channel inhibitor]]
[[Category: Sodium channel inhibitor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:10:55 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 21:47:59 2008''

Revision as of 18:48, 2 July 2008

Image:1lqi.png

Template:STRUCTURE 1lqi

INSECTICIDAL ALPHA SCORPION TOXIN ISOLATED FROM THE VENOM OF SCORPION LEIURUS QUINQUESTRIATUS HEBRAEUS, NMR, 29 STRUCTURES

Template:ABSTRACT PUBMED 9054546

About this Structure

1LQI is a Single protein structure of sequence from Leiurus quinquestriatus hebraeus. Full experimental information is available from OCA.

Reference

Solution structures of a highly insecticidal recombinant scorpion alpha-toxin and a mutant with increased activity., Tugarinov V, Kustanovich I, Zilberberg N, Gurevitz M, Anglister J, Biochemistry. 1997 Mar 4;36(9):2414-24. PMID:9054546

Page seeded by OCA on Wed Jul 2 21:47:59 2008

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