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Self-assembly of three bacterially-derived bioactive lipopeptides

Hamley, I. W., Dehsorkhi, A., Jauregi, P., Seitsonen, J., Ruokolainen, J., Coutte, F., Chataigne, G. and Jacques, P. (2013) Self-assembly of three bacterially-derived bioactive lipopeptides. Soft Matter, 9 (40). pp. 9572-9578. ISSN 1744-683X

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To link to this item DOI: 10.1039/c3sm51514a

Abstract/Summary

The self-assembly in aqueous solution of three lipopeptides obtained from Bacillus subtilis has been investigated. The lipopeptides surfactin, plipastatin and mycosubtilin contain distinct cyclic peptide headgroups as well as differences in alkyl chain length, branching and chain length distribution. Cryogenic transmission electron microscopy and X-ray scattering reveal that surfactin and plipastatin aggregate into 2 nm-radius spherical micelles, whereas in complete contrast mycosubtilin self-assembles into extended nanotapes based on bilayer ordering of the lipopeptides. Circular dichroism and FTIR spectroscopy indicate the presence of turn structures in the cyclic peptide headgroup. The unexpected distinct mode of self-assembly of mycosubtilin compared to the other two lipopeptides is ascribed to differences in the surfactant packing parameter. This in turn is due to specific features of the conformation of the peptide headgroup and alkyl chain branching.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Chemical Analysis Facility (CAF)
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:34257
Publisher:Royal Society of Chemistry

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