Solution structure and interaction of cupiennin 1a, a spider venom peptide, with phospholipid bilayers

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dc.contributor.authorPukala, T.
dc.contributor.authorBoland, M.
dc.contributor.authorGehman, J.
dc.contributor.authorKuhn-Nentwig, L.
dc.contributor.authorSeparovic, F.
dc.contributor.authorBowie, J.
dc.date.issued2007
dc.descriptionCopyright © 2007 American Chemical Society
dc.description.abstractThe solution structure of cupiennin 1a, a 35 residue, basic antibacterial peptide isolated from the venom of the spider Cupiennius salei, has been determined by nuclear magnetic resonance (NMR) spectroscopy. The peptide was found to adopt a helix-hinge-helix structure in a membrane mimicking solvent. The hinge may play a role in allowing the amphipathic N-terminal helix and polar C-terminal helix to orient independently upon membrane binding, in order to achieve maximal antibacterial efficacy. Solid-state 31P and 2H NMR was used to further study the effects of cupiennin 1a on the dynamic properties of lipid membranes, using zwitterionic chain deuterated dimyristoylphosphatidylcholine (d54-DMPC) and anionic dimyristoylphosphatidylglycerol (DMPG) multilamellar vesicles. In d54-DMPC alone, cupiennin 1a caused a decrease in the 31P chemical shift anisotropy, indicating some interaction with the lipid head groups, and a decrease in order over the entire acyl chain. In contrast, for the mixed (d54-DMPC/DMPG) lipid system cupiennin 1a appeared to induce lateral separation of the two lipids as evidenced by the 31P spectra, in which the peptide preferentially interacted with DMPG. Little effect was observed on the deuterated acyl chain order parameters in the d54-DMPC/DMPG model membranes. Furthermore, 31P NMR relaxation measurements confirmed a differential effect on the lipid motions depending upon the membrane composition. Therefore, subtle differences are likely in the mechanism by which cupiennin 1a causes membrane lysis in either prokaryotic or eukaryotic cells, and may explain the specific spectrum of activity.
dc.description.statementofresponsibilityTara L. Pukala, Martin P. Boland, John D. Gehman, Lucia Kuhn-Nentwig, Frances Separovic, and John H. Bowie
dc.identifier.citationBiochemistry, 2007; 46(11):3576-3585
dc.identifier.doi10.1021/bi062306
dc.identifier.issn0006-2960
dc.identifier.issn1520-4995
dc.identifier.orcidPukala, T. [0000-0001-7391-1436]
dc.identifier.urihttp://hdl.handle.net/2440/43310
dc.language.isoen
dc.provenanceWeb Release Date: February 24, 2007
dc.publisherAmer Chemical Soc
dc.source.urihttp://pubs.acs.org/cgi-bin/abstract.cgi/bichaw/2007/46/i11/abs/bi062306+.html
dc.subjectAnimals
dc.subjectSpiders
dc.subjectPhosphorus Isotopes
dc.subjectLipid Bilayers
dc.subjectDimyristoylphosphatidylcholine
dc.subjectPhosphatidylglycerols
dc.subjectPeptides
dc.subjectAntimicrobial Cationic Peptides
dc.subjectSpider Venoms
dc.subjectLiposomes
dc.subjectNuclear Magnetic Resonance, Biomolecular
dc.subjectAmino Acid Sequence
dc.subjectMolecular Sequence Data
dc.titleSolution structure and interaction of cupiennin 1a, a spider venom peptide, with phospholipid bilayers
dc.typeJournal article
pubs.publication-statusPublished

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