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1mxp

From Proteopedia

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Revision as of 10:06, 25 October 2017

Solution structure of the ribbon disulfide bond isomer of alpha-conotoxin AuIB

Structural highlights

1mxp is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:
Related:	1mxn
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[CA1B_CONAL] Alpha-conotoxins act on postsynaptic membranes, they bind to the nicotinic acetylcholine receptors (nAChR) and thus inhibit them. This toxin blocks mammalian nAChR alpha-3/beta-4 subunits.^[1]

Publication Abstract from PubMed

alpha-Conotoxin AuIB and a disulfide bond variant of AuIB have been synthesized to determine the role of disulfide bond connectivity on structure and activity. Both of these peptides contain the 15 amino acid sequence GCCSYPPCFATNPDC, with the globular (native) isomer having the disulfide connectivity Cys(2-8 and 3-15) and the ribbon isomer having the disulfide connectivity Cys(2-15 and 3-8). The solution structures of the peptides were determined by NMR spectroscopy, and their ability to block the nicotinic acetylcholine receptors on dissociated neurons of the rat parasympathetic ganglia was examined. The ribbon disulfide isomer, although having a less well defined structure, is surprisingly found to have approximately 10 times greater potency than the native peptide. To our knowledge this is the first demonstration of a non-native disulfide bond isomer of a conotoxin exhibiting greater biological activity than the native isomer.

A new level of conotoxin diversity, a non-native disulfide bond connectivity in alpha-conotoxin AuIB reduces structural definition but increases biological activity.,Dutton JL, Bansal PS, Hogg RC, Adams DJ, Alewood PF, Craik DJ J Biol Chem. 2002 Dec 13;277(50):48849-57. Epub 2002 Oct 9. PMID:12376538^[2]

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

References

↑ Luo S, Kulak JM, Cartier GE, Jacobsen RB, Yoshikami D, Olivera BM, McIntosh JM. alpha-conotoxin AuIB selectively blocks alpha3 beta4 nicotinic acetylcholine receptors and nicotine-evoked norepinephrine release. J Neurosci. 1998 Nov 1;18(21):8571-9. PMID:9786965
↑ Dutton JL, Bansal PS, Hogg RC, Adams DJ, Alewood PF, Craik DJ. A new level of conotoxin diversity, a non-native disulfide bond connectivity in alpha-conotoxin AuIB reduces structural definition but increases biological activity. J Biol Chem. 2002 Dec 13;277(50):48849-57. Epub 2002 Oct 9. PMID:12376538 doi:10.1074/jbc.M208842200

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

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

@@ Line 1: / Line 1: @@
 ==Solution structure of the ribbon disulfide bond isomer of alpha-conotoxin AuIB==
 <StructureSection load='1mxp' size='340' side='right' caption='[[1mxp]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1mxn|1mxn]]</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=1mxp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxp OCA], [http://pdbe.org/1mxp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1mxp RCSB], [http://www.ebi.ac.uk/pdbsum/1mxp PDBsum]</span></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=1mxp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mxp OCA], [http://pdbe.org/1mxp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1mxp RCSB], [http://www.ebi.ac.uk/pdbsum/1mxp PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1mxp ProSAT]</span></td></tr>
 </table>
 == Function ==

1mxp

From Proteopedia

Revision as of 10:06, 25 October 2017

Solution structure of the ribbon disulfide bond isomer of alpha-conotoxin AuIB

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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