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  • Title: Surugamides A-E, cyclic octapeptides with four D-amino acid residues, from a marine Streptomyces sp.: LC-MS-aided inspection of partial hydrolysates for the distinction of D- and L-amino acid residues in the sequence.
    Author: Takada K, Ninomiya A, Naruse M, Sun Y, Miyazaki M, Nogi Y, Okada S, Matsunaga S.
    Journal: J Org Chem; 2013 Jul 05; 78(13):6746-50. PubMed ID: 23745669.
    Abstract:
    Surugamides A-E (1-5), cyclic octapeptides with four D-amino acid residues, were isolated from the broth of marine-derived Streptomyces sp. Their planar structures were determined by analyses of spectroscopic data, and the absolute configuration of constituent amino acid residues was determined by the Marfey's method. Differentiation of D-Ile and L-Ile in the sequence was established by chiral analysis of fragment peptides obtained from the partial hydrolysate, whose identification was conducted by LC-MS/MS.
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