Publicação: Interaction of cyclic and linear Labaditin peptides with anionic and zwitterionic micelles
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Elsevier B.V.
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Artigo
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Resumo
Conformational changes of the cyclic (Lo) peptide Labaditin (VWTVWGTIAG) and its linear analogue (L-1) promoted by presence of anionic sodium dodecyl sulfate (SDS) and zwitterionic L-alpha-Lysophosphatidylcholine (LPC) micelles were investigated. Results from lambda(max) blue-shift of tryptophan fluorescence emission combined with Stern-Volmer constants values and molecular dynamics (MD) simulations indicated that L-1 interacts with SDS micelles to a higher extent than does Lo. Further, the MD simulation demonstrated that both Lo and L-1 interact similarly with LPC micelles, being preferentially located at the micelle/water interface. The peptide-micelle interaction elicits conformational changes in the peptides. Lo undergoes limited modifications and presents unordered structure in both LPC and SDS micelles. On the other hand, L-1 displays a random-coil structure in aqueous medium, pH 7.0, and it acquires a beta-structure upon interaction with SDS and LPC, albeit with structural differences in each medium. (C) 2014 Elsevier Inc. All rights reserved.
Descrição
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Labaditin, Cyclic peptide, Circular dichroism, Fluorescence, Molecular dynamic
Idioma
Inglês
Como citar
Journal Of Colloid And Interface Science. San Diego: Academic Press Inc Elsevier Science, v. 438, p. 39-46, 2015.
