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1agt

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{{STRUCTURE_1agt| PDB=1agt | SCENE= }}
{{STRUCTURE_1agt| PDB=1agt | SCENE= }}
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'''SOLUTION STRUCTURE OF THE POTASSIUM CHANNEL INHIBITOR AGITOXIN 2: CALIPER FOR PROBING CHANNEL GEOMETRY'''
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===SOLUTION STRUCTURE OF THE POTASSIUM CHANNEL INHIBITOR AGITOXIN 2: CALIPER FOR PROBING CHANNEL GEOMETRY===
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==Overview==
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The structure of the potassium channel blocker agitoxin 2 was solved by solution NMR methods. The structure consists of a triple-stranded antiparallel beta-sheet and a single helix covering one face of the beta-sheet. The cysteine side chains connecting the beta-sheet and the helix form the core of the molecule. One edge of the beta-sheet and the adjacent face of the helix form the interface with the Shaker K+ channel. The fold of agitoxin is homologous to the previously determined folds of scorpion venom toxins. However, agitoxin 2 differs significantly from the other channel blockers in the specificity of its interactions. This study was thus focused on a precise characterization of the surface residues at the face of the protein interacting with the Shaker K+ channel. The rigid toxin molecule can be used to estimate dimensions of the potassium channel. Surface-exposed residues, Arg24, Lys27, and Arg31 of the beta-sheet, have been identified from mutagenesis studies as functionally important for blocking the Shaker K+ channel. The sequential and spatial locations of Arg24 and Arg31 are not conserved among the homologous toxins. Knowledge on the details of the channel-binding sites of agitoxin 2 formed a basis for site-directed mutagenesis studies of the toxin and the K+ channel sequences. Observed interactions between mutated toxin and channel are being used to elucidate the channel structure and mechanisms of channel-toxin interactions.
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{{ABSTRACT_PUBMED_8520473}}
==About this Structure==
==About this Structure==
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1AGT 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=1AGT OCA].
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1AGT 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=1AGT OCA].
==Reference==
==Reference==
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[[Category: Wagner, G.]]
[[Category: Wagner, G.]]
[[Category: Potassium channel blocker]]
[[Category: Potassium channel blocker]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:15:01 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:49:06 2008''

Revision as of 13:49, 30 June 2008

Image:1agt.png

Template:STRUCTURE 1agt

SOLUTION STRUCTURE OF THE POTASSIUM CHANNEL INHIBITOR AGITOXIN 2: CALIPER FOR PROBING CHANNEL GEOMETRY

Template:ABSTRACT PUBMED 8520473

About this Structure

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

Reference

Solution structure of the potassium channel inhibitor agitoxin 2: caliper for probing channel geometry., Krezel AM, Kasibhatla C, Hidalgo P, MacKinnon R, Wagner G, Protein Sci. 1995 Aug;4(8):1478-89. PMID:8520473

Page seeded by OCA on Mon Jun 30 16:49:06 2008

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