1hvw
From Proteopedia
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|GENE= | |GENE= | ||
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| + | |RELATEDENTRY=[[1axh|1AXH]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1hvw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hvw OCA], [http://www.ebi.ac.uk/pdbsum/1hvw PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1hvw RCSB]</span> | ||
}} | }} | ||
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[[Category: cystine knot]] | [[Category: cystine knot]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:11:07 2008'' |
Revision as of 18:11, 30 March 2008
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| Related: | 1AXH
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
HAIRPINLESS MUTANT OF OMEGA-ATRACOTOXIN-HV1A
Overview
omega-Atracotoxin-Hv1a is an insect-specific neurotoxin whose phylogenetic specificity derives from its ability to antagonize insect, but not vertebrate, voltage-gated calcium channels. In order to help understand its mechanism of action and to enhance its utility as a lead compound for insecticide development, we used a combination of protein engineering and site-directed mutagenesis to probe the toxin for key functional regions. First, we constructed a Hairpinless mutant in which the C-terminal beta-hairpin, which is highly conserved in this family of neurotoxins, was excised without affecting the fold of the residual disulfide-rich core of the toxin. The Hairpinless mutant was devoid of insecticidal activity, indicating the functional importance of the hairpin. We subsequently developed a highly efficient system for production of recombinant toxin and then probed the hairpin for key functional residues using alanine-scanning mutagenesis followed by a second round of mutagenesis based on initial "hits" from the alanine scan. This revealed that two spatially proximal residues, Asn(27) and Arg(35), form a contiguous molecular surface that is essential for toxin activity. We propose that this surface of the beta-hairpin is a key site for interaction of the toxin with insect calcium channels.
About this Structure
1HVW is a Single protein structure of sequence from [1]. Full crystallographic information is available from OCA.
Reference
Functional significance of the beta hairpin in the insecticidal neurotoxin omega-atracotoxin-Hv1a., Tedford HW, Fletcher JI, King GF, J Biol Chem. 2001 Jul 13;276(28):26568-76. Epub 2001 Apr 19. PMID:11313356
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