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dc.contributor.authorTselios, T.en
dc.contributor.authorProbert, L.en
dc.contributor.authorDaliani, I.en
dc.contributor.authorMatsoukas, E.en
dc.contributor.authorTroganis, A.en
dc.contributor.authorGerothanassis, I. P.en
dc.contributor.authorMavromoustakos, T.en
dc.contributor.authorMoore, G. J.en
dc.contributor.authorMatsoukas, J. M.en
dc.rightsDefault Licence-
dc.subjectmultiple-sclerosis patientsen
dc.subjectt-cell clonesen
dc.subjectpeptide analogsen
dc.subjectrotating frameen
dc.titleDesign and synthesis of a potent cyclic analogue of the myelin basic protein epitope MBP72-85: Importance of the Ala(81) carboxyl group and of at cyclic conformation for induction of experimental allergic encephalomyelitisen
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.primaryDoi 10.1021/Jm980250e-
heal.identifier.secondary<Go to ISI>://000079636000006-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.abstractExperimental allergic encephalomyelitis (EAE) is induced in susceptible animals by immunodominant determinants of myelin basic protein (MBP), such as guinea pig sequence MBP72-85. Two linear and one cyclic analogues based on MBP72-85 have been synthesized and evaluated for EAE induction in Lewis rats. The line ar peptide Gln(1)-Lys-(2)Ser(3)-Gln(4)-Arg(5)-Ser(6)-Gln(7)-Asp(8)-Glu(9)-Asn(10)-Pro(11)-Val(12) (1) was found to induce EAE, while substitution of the Asp residue at position 8 with Ala resulted in an analogue (2) which suppressed the induction of EAE by its parent peptide. Nuclear magnetic resonance studies of analogue 1 in dimethyl sulfoxide (DMSO) using TOCSY/ROESY techniques revealed a head-to-tail intramolecular interaction (ROE connectivity between beta Val(12)-gamma Gln(1)), indicating a pseudocyclic conformation for the immunogenic peptide 1. A conformational model was developed using NMR constraints and molecular dynamics. Based on this model, a novel amide-linked cyclic analogue has been designed and synthesized by connecting the side-chain amino and carboxyl groups of Lys and Glu at positions 2 and 9, respectively, of linear analogue 1. The cyclic analogue Gln-Lys-Ser-GLn-Arg-Ser-Gln-Asp-Glu-Asn-Pro-Val-NH2 (3) had similar activity to the linear peptide 1, and the EAE effects induced by cyclic analogue 3 Were completely suppressed by co;injection with the Ala(81)-substituted analogue 2 in Lewis rats. The similar potencies of analogues 1 and 3 support the proposed cyclic comformation suggested for analogue-1 from NMR studies and computer modeling and provides the basis for designing more potent molecules with improved properties such as increased resistance:,to degradation.(15) The present findings suggest that a cyclic conformation for the MBP72-85 epitope positions the carboxyl group of Asp(81) correctly and presumably other side groups of the peptide such as Arg(78) in a manner which enables functional binding of the trimolecular complex MHC-peptide-T cell receptor resulting in EAE.en
heal.publisherAmerican Chemical Societyen
heal.journalNameJ Med Chemen
heal.journalTypepeer reviewed-
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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