Application of HR-MAS NMR in the solid-phase synthesis of a glycopeptide using Sieber amide resin

Lu?sa R. Carvalho, Marta C. Corvo, Ramu Enugala, M. Manuel B. Marques, Eurico J. Cabrita

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13 Citations (Scopus)

Abstract

The solid-phase synthesis (SPS) of a structurally complex glycopeptide, using Sieber amide resin, was monitored by high resolution magic angle spinning NMR, demonstrating the further application of this technique. A synthetic peptidoglycan derivative, a precursor of a biologically active PGN, known to be involved in the cellular recognition, was prepared by SPS. The synthesis involved the preparation of an N-alloc glucosamine moiety and the synthesis of a simple amino acid sequence L-Ala-D-Glu-L-Lys-D-Ala-D-Ala. Last step consisted the coupling, on solid-phase, of the protected muramyl unit to the peptide chain. Proton spectra with good suppression of the polystyrene signals in swollen resin samples were obtained in DMF-d(7) as a solvent and by using a nonselective 1D TOCSY/DIPSI-2 scheme, thus allowing to follow the SPS without losses of compound and cleavage from the resin. The assignment of the proton spectra of the resin-bound amino acid sequence and of the bound glycopeptide was achieved through the combination of MAS COSY, TOCSY and NOESY. Copyright (C) 2010 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)323-330
JournalMagnetic Resonance in Chemistry
Volume48
Issue number4
DOIs
Publication statusPublished - 1 Apr 2010

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