1axh

From Proteopedia

(Difference between revisions)

Revision as of 07:55, 11 September 2015

ATRACOTOXIN-HVI FROM HADRONYCHE VERSUTA (AUSTRALIAN FUNNEL-WEB SPIDER, NMR, 20 STRUCTURES

Structural highlights

1axh is a 1 chain structure with sequence from Atrax versutus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[TOT1A_HADVE] Reversibly and voltage-independently blocks both mid-low- (M-LVA) and high-voltage-activated (HVA) calcium channels in cockroach DUM neurons. Lethal to many insect orders but not toxic to mice or rabbits. May target the insect high-voltage-activated calcium channel Dmca1D. Also inhibits acarines calcium channels. An extremely high toxin concentration partially inhibits Cav1.2/CACNA1C, Cav2.1/CACNA1A and Cav2.2/CACNA1B calcium channel of rats. As for omega-AcTx-Hv2a, the phenotypic effect of injection of this toxin into lone star ticks (Amblyomma americanum) is curling of all eight legs into closed loops.^[1] ^[2] ^[3] ^[4] ^[5]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

A family of potent insecticidal toxins has recently been isolated from the venom of Australian funnel web spiders. Among these is the 37-residue peptide omega-atracotoxin-HV1 (omega-ACTX-HV1) from Hadronyche versuta. We have chemically synthesized and folded omega-ACTX-HV1, shown that it is neurotoxic, ascertained its disulphide bonding pattern, and determined its three-dimensional solution structure using NMR spectroscopy. The structure consists of a solvent-accessible beta-hairpin protruding from a disulphide-bonded globular core comprising four beta-turns. The three intramolecular disulphide bonds from a cystine knot motif similar to that seen in several other neurotoxic peptides. Despite limited sequence identity, omega-ACTX-HV1 displays significant structural homology with the omega-agatoxins and omega-conotoxins, both of which are vertebrate calcium channel antagonists; however, in contrast with these toxins, we show that omega-ACTX-HV1 inhibits insect, but not mammalian, voltage-gated calcium channel currents.

The structure of a novel insecticidal neurotoxin, omega-atracotoxin-HV1, from the venom of an Australian funnel web spider.,Fletcher JI, Smith R, O'Donoghue SI, Nilges M, Connor M, Howden ME, Christie MJ, King GF Nat Struct Biol. 1997 Jul;4(7):559-66. PMID:9228949^[6]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Bloomquist JR. Mode of action of atracotoxin at central and peripheral synapses of insects. Invert Neurosci. 2003 Nov;5(1):45-50. Epub 2003 Nov 8. PMID:14608494 doi:http://dx.doi.org/10.1007/s10158-003-0027-z
↑ Tedford HW, Gilles N, Menez A, Doering CJ, Zamponi GW, King GF. Scanning mutagenesis of omega-atracotoxin-Hv1a reveals a spatially restricted epitope that confers selective activity against insect calcium channels. J Biol Chem. 2004 Oct 15;279(42):44133-40. Epub 2004 Aug 11. PMID:15308644 doi:http://dx.doi.org/10.1074/jbc.M404006200
↑ Mukherjee AK, Sollod BL, Wikel SK, King GF. Orally active acaricidal peptide toxins from spider venom. Toxicon. 2006 Feb;47(2):182-7. Epub 2005 Dec 5. PMID:16330063 doi:http://dx.doi.org/10.1016/j.toxicon.2005.10.011
↑ Chong Y, Hayes JL, Sollod B, Wen S, Wilson DT, Hains PG, Hodgson WC, Broady KW, King GF, Nicholson GM. The omega-atracotoxins: selective blockers of insect M-LVA and HVA calcium channels. Biochem Pharmacol. 2007 Aug 15;74(4):623-38. Epub 2007 May 25. PMID:17610847 doi:http://dx.doi.org/10.1016/j.bcp.2007.05.017
↑ Tedford HW, Maggio F, Reenan RA, King G. A model genetic system for testing the in vivo function of peptide toxins. Peptides. 2007 Jan;28(1):51-6. Epub 2006 Dec 1. PMID:17141372 doi:http://dx.doi.org/10.1016/j.peptides.2006.08.026
↑ Fletcher JI, Smith R, O'Donoghue SI, Nilges M, Connor M, Howden ME, Christie MJ, King GF. The structure of a novel insecticidal neurotoxin, omega-atracotoxin-HV1, from the venom of an Australian funnel web spider. Nat Struct Biol. 1997 Jul;4(7):559-66. PMID:9228949

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1axh"

@@ Line 2: / Line 2: @@
 <StructureSection load='1axh' size='340' side='right' caption='[[1axh]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1axh]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Hadronyche_versuta Hadronyche versuta]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AXH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AXH FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1axh]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atrax_versutus Atrax versutus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AXH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AXH FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1axh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1axh OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1axh RCSB], [http://www.ebi.ac.uk/pdbsum/1axh PDBsum]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1axh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1axh OCA], [http://pdbe.org/1axh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1axh RCSB], [http://www.ebi.ac.uk/pdbsum/1axh PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 25: / Line 25: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1axh" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Hadronyche versuta]]
+[[Category: Atrax versutus]]
 [[Category: Donoghue, S I.O]]
 [[Category: Fletcher, J I]]

1axh

From Proteopedia

Revision as of 07:55, 11 September 2015

ATRACOTOXIN-HVI FROM HADRONYCHE VERSUTA (AUSTRALIAN FUNNEL-WEB SPIDER, NMR, 20 STRUCTURES

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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