1sxm

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{{STRUCTURE_1sxm| PDB=1sxm | SCENE= }}
{{STRUCTURE_1sxm| PDB=1sxm | SCENE= }}
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'''SCORPION TOXIN (NOXIUSTOXIN) WITH HIGH AFFINITY FOR VOLTAGE DEPENDENT POTASSIUM CHANNEL AND LOW AFFINITY FOR CALCIUM DEPENDENT POTASSIUM CHANNEL (NMR AT 20 DEGREES, PH3.5, 39 STRUCTURES)'''
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===SCORPION TOXIN (NOXIUSTOXIN) WITH HIGH AFFINITY FOR VOLTAGE DEPENDENT POTASSIUM CHANNEL AND LOW AFFINITY FOR CALCIUM DEPENDENT POTASSIUM CHANNEL (NMR AT 20 DEGREES, PH3.5, 39 STRUCTURES)===
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==Overview==
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The 3D structure of noxiustoxin, the first identified scorpion toxin acting on K+ channels, has been elucidated by NMR and molecular modeling. Thirty-nine solution structures were calculated using 572 distance and 42 dihedral restraints. The average atomic rms deviation between the refined structures and the mean structure is 0.75 A for the backbone atoms. Noxiustoxin adopts a alpha/beta scaffold constituted of a three-stranded beta-sheet (residues 2-3, 25-30, 33-38) linked to a helix (residues 10-20) through two disulfide bridges. A comparison between the 3D structure of noxiustoxin and those of other structurally and functionally related scorpion toxins (charybdotoxin, PO5-NH2, kaliotoxin) revealed a bending capacity of the helix and a variability in the relative orientations between the helix and the beta-sheet. These two features highlight the plasticity of the alpha/beta scaffold and offer a structural explanation for the capacity of the fold to accommodate an additional alanine residue in the Gly-x-Cys pattern of a previously proposed consensus sequence [Bontems et al. (1991) Science 254, 1521-1523]. Our structural data also emphasize the possibility that the beta-sheet of NTX is implicated in the capacity of NTX to recognize voltage-dependent K+ channels.
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{{ABSTRACT_PUBMED_8527429}}
==About this Structure==
==About this Structure==
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1SXM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Centruroides_noxius Centruroides noxius]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SXM OCA].
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1SXM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Centruroides_noxius Centruroides noxius]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SXM OCA].
==Reference==
==Reference==
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[[Category: Roumestand, C.]]
[[Category: Roumestand, C.]]
[[Category: Toxin]]
[[Category: Toxin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 15:13:09 2008''

Revision as of 12:13, 27 July 2008

Image:1sxm.png

Template:STRUCTURE 1sxm

SCORPION TOXIN (NOXIUSTOXIN) WITH HIGH AFFINITY FOR VOLTAGE DEPENDENT POTASSIUM CHANNEL AND LOW AFFINITY FOR CALCIUM DEPENDENT POTASSIUM CHANNEL (NMR AT 20 DEGREES, PH3.5, 39 STRUCTURES)

Template:ABSTRACT PUBMED 8527429

About this Structure

1SXM is a Single protein structure of sequence from Centruroides noxius. Full experimental information is available from OCA.

Reference

Determination of the three-dimensional solution structure of noxiustoxin: analysis of structural differences with related short-chain scorpion toxins., Dauplais M, Gilquin B, Possani LD, Gurrola-Briones G, Roumestand C, Menez A, Biochemistry. 1995 Dec 26;34(51):16563-73. PMID:8527429

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