Effect of chain length of HAV-VP3 synthetic peptides on its interaction with biomembrane models |
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Authors: | Sospedra P Muñoz M García M Alsina M A Mestres C Haro I |
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Institution: | Physicochemical Department, Faculty of Pharmacy, Av. Joan XXIII s/n, 08028 Barcelona, Spain. |
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Abstract: | Shorter analogues of a continuous epitope of hepatitis A virus, VP3(110-121) peptide, failed to react with convalescent sera, indicating the importance of the entire peptide in the epitope structure. To better understand the influence of the structural properties of this 12-mer peptide epitope on its biological activity, the interaction of smaller peptide analogues with phospholipid biomembrane models was investigated by a combination of spectroscopic and biophysical techniques. In this article we describe our findings concerning the surface activity and the interaction of peptides with simple mono- and bilayer membranes composed of a zwitterionic phospholipid (dipalmitoyl phosphatidylcholine, DPPC), an anionic phospholipid (dipalmitoyl phosphatidylglicerol, DPPG), or a DPPC/DPPG mixture. The results indicate that the net negative charge of the peptide is in some way responsible of the specific interactions between VP3(110-121) and membrane phospholipids, and necessary to induce beta-type conformations upon vesicle interaction. |
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