1niy

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{{STRUCTURE_1niy| PDB=1niy | SCENE= }}
{{STRUCTURE_1niy| PDB=1niy | SCENE= }}
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'''THREE DIMENSIONAL SOLUTION STRUCTURE OF HAINANTOXIN-IV BY 2D 1H-NMR'''
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===THREE DIMENSIONAL SOLUTION STRUCTURE OF HAINANTOXIN-IV BY 2D 1H-NMR===
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==Overview==
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Hainantoxin-IV (HNTX-IV) can specifically inhibit the neuronal tetrodotoxin-sensitive sodium channels and defines a new class of depressant spider toxin. The sequence of native HNTX-IV is ECLGFGKGCNPSNDQCCKSSNLVCSRKHRWCKYEI-NH(2). In the present study, to obtain further insight into the primary and tertiary structural requirements of neuronal sodium channel blockers, we determined the solution structure of HNTX-IV as a typical inhibitor cystine knot motif and synthesized four mutants designed based on the predicted sites followed by structural elucidation of two inactive mutants. Pharmacological studies indicated that the S12A and R26A mutants had activities near that of native HNTX-IV, while K27A and R29A demonstrated activities reduced by 2 orders of magnitude. (1)H MR analysis showed the similar molecular conformations for native HNTX-IV and four synthetic mutants. Furthermore, in the determined structures of K27A and R29A, the side chains of residues 27 and 29 were located in the identical spatial position to those of native HNTX-IV. These results suggested that residues Ser(12), Arg(26), Lys(27), and Arg(29) were not responsible for stabilizing the distinct conformation of HNTX-IV, but Lys(27) and Arg(29) were critical for the bioactivities. The potency reductions produced by Ala substitutions were primarily due to the direct interaction of the essential residues Lys(27) and Arg(29) with sodium channels rather than to a conformational change. After comparison of these structures and activities with correlated toxins, we hypothesized that residues Lys(27), Arg(29), His(28), Lys(32), Phe(5), and Trp(30) clustered on one face of HNTX-IV were responsible for ligand binding.
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{{ABSTRACT_PUBMED_15201273}}
==About this Structure==
==About this Structure==
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1NIY is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Ornithoctonus_hainana Ornithoctonus hainana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NIY OCA].
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1NIY is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Ornithoctonus_hainana Ornithoctonus hainana]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NIY OCA].
==Reference==
==Reference==
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[[Category: Inhibitor cystine knot motif]]
[[Category: Inhibitor cystine knot motif]]
[[Category: Neurotoxin]]
[[Category: Neurotoxin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:35:22 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:58:11 2008''

Revision as of 06:58, 28 July 2008

Image:1niy.png

Template:STRUCTURE 1niy

THREE DIMENSIONAL SOLUTION STRUCTURE OF HAINANTOXIN-IV BY 2D 1H-NMR

Template:ABSTRACT PUBMED 15201273

About this Structure

1NIY is a Single protein structure of sequence from Ornithoctonus hainana. Full experimental information is available from OCA.

Reference

Structure--activity relationships of hainantoxin-IV and structure determination of active and inactive sodium channel blockers., Li D, Xiao Y, Xu X, Xiong X, Lu S, Liu Z, Zhu Q, Wang M, Gu X, Liang S, J Biol Chem. 2004 Sep 3;279(36):37734-40. Epub 2004 Jun 16. PMID:15201273

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