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The synergistic action of melittin and phospholipase A2 with lipid membranes : development of linear dichroism for membrane-insertion kinetics.

Damianoglou, Angeliki and Rodger, Alison and Pridmore, Catherine and Dafforn, Timothy R. and Mosely, Jackie A. and Sanderson, John M. and Hicks, Matthew R. (2010) 'The synergistic action of melittin and phospholipase A2 with lipid membranes : development of linear dichroism for membrane-insertion kinetics.', Protein & peptide letters., 17 (11). pp. 1351-1362.

Abstract

Here we present data on the kinetics of insertion of melittin, a peptide from bee venom, into lipid membranes of different composition. Another component of bee venom is the enzyme phospholipase A2 (PLA₂). We have examined the interaction of melittin and PLA₂ with liposomes both separately and combined and demonstrate that they work synergistically to disrupt the membranes. A dramatic difference in the action of melittin and PLA₂ is observed when the composition of the membrane is altered. Temperature also has a large effect on the kinetics of insertion and membrane disruption. We use a combination of techniques to measure liposome size (dynamic light scattering), peptide secondary structure (circular dichroism spectroscopy), peptide orientation relative to the membrane (linear dichroism spectroscopy) and enzymatic digestion of the lipids (mass spectrometry).

Item Type:Article
Additional Information:PMID: 20673225
Keywords:Amphipathic, Peptide, Antimicrobial, Membrane protein, Linear dichroism, Liposome, Dynamic light scattering, Membrane, Linear, Dynamic, (PLA2), (mass spectrometry), Crystallography, NMR, (LD), Melittin, (DOPC), DOPG, (POPC), DMPC, (TLC), (OCD), (PDPC).
Full text:PDF - Submitted Version (950Kb)
Status:Not peer-reviewed
Publisher Web site:http://www.benthamdirect.org/pages/content.php?PPL/2010/00000017/00000011/0006E.SGM
Record Created:21 Jun 2011 10:50
Last Modified:03 Jan 2012 13:22

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