Conformational study of new amphipathic alpha-helical peptide models of apoA-I as potential atheroprotective agents

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dc.contributor.authorBeaufils, C.en
dc.contributor.authorAlexopoulos, C.en
dc.contributor.authorPetraki, M. P.en
dc.contributor.authorTselepis, A. D.en
dc.contributor.authorCoudevylle, N.en
dc.contributor.authorSakarellos-Daitsiotis, M.en
dc.contributor.authorSakarellos, C.en
dc.contributor.authorCung, M. T.en
dc.date.accessioned2015-11-24T16:54:46Z
dc.date.available2015-11-24T16:54:46Z
dc.identifier.issn0006-3525-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/10193
dc.rightsDefault Licence-
dc.subjectapolipoprotein a-ien
dc.subjectamphipathic alpha-helixen
dc.subjectatheroprotective peptide modelsen
dc.subjecthdlen
dc.subjectldlen
dc.subject2d-nmren
dc.subjectnoesyen
dc.subjectmolecular modelingen
dc.subjectcden
dc.subjectfluorescenceen
dc.subjectapolipoprotein-a-ien
dc.subjectmagnetic-resonance spectroscopyen
dc.subjectlow-density-lipoproteinen
dc.subjectsolid-phase synthesisen
dc.subject3-dimensional structuresen
dc.subjectoxidative modificationen
dc.subjectstructural-analysisen
dc.subjectsecondary structureen
dc.subjectcholesterol effluxen
dc.subjectnmr-spectroscopyen
dc.titleConformational study of new amphipathic alpha-helical peptide models of apoA-I as potential atheroprotective agentsen
heal.abstractAiming at contributing to the development of potential atheroprotective,agents, we report on the concept and design of two peptide models, which mimic the amphipathic helices of apoA-I and incorporate Met into their sequences to validate its role as oxidant scavenger. Ac-ESK(Palm)(KELSKSWSEMLKEK)-S-10-L-13(Palm)SKS-NH2 (model 1 [W-10, M-13]) and Ac-ESK(Palm)(KELSKSMSEW13)-S-10 LKEK(Palm)SKS-NH2 (model 2 [M-10 W-13]). Hydrophobic residues of both models cover about the half of the surface, while the positively and negatively charged residues constitute two separate clusters on the hydrophilic face. Palmitoyl groups were introduced into the Lys-(MH2)-H-s groups at positions 3 and 17 to contribute to the amphipathic character of the peptides and stabilize the nonpolar face of the helix. Conformational study by the combined application of 2D-NMR and molecular dynamics simulations, CD, FTIR, and fluorescence spectroscopy revealed that model I adopts helical conformation and Met is well exposed to the microenvironment. Model 2 that derives from model 1 by exchanging W-10 (model 1) with M-10 and M-13 (model 1) with W-13 also displays helical characteristics, while Met is rather shielded. Oxidation experiments indicated that model I exhibits a 2-fold more potent antioxidant activity towards LDL oxidation, compared to model 2, confirming the role of Met, when is devoid of steric hindrances, as oxidant scavenger for the protection of LDL. (c) 2006 Wiley Periodicals, Inc.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDoi 10.1002/Bip.20651-
heal.identifier.secondary<Go to ISI>://000245937400004-
heal.identifier.secondaryhttp://onlinelibrary.wiley.com/store/10.1002/bip.20651/asset/20651_ftp.pdf?v=1&t=h0e0j28c&s=9fbd1743dff12c6027f907bf0a89436d47b8c4e8-
heal.journalNameBiopolymersen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2007-
heal.publisherWileyen
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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