Ando S, Kato T, Izumiya N. Studies of peptide antibiotics. XLVI. Syntheses of gramicidin S analogs containing D-alpha,beta-diaminopropionic acid or alpha,beta-dehydroalanine.
INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1985;
25:15-26. [PMID:
2579921 DOI:
10.1111/j.1399-3011.1985.tb02142.x]
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Abstract
A gramicidin S (GS) analog ([D-Dpr4,4'] GS) containing D-alpha,beta-diaminopropionic acid (D-Dpr) in place of D-Phe at 4,4' positions was derived from [L-Orn(delta-formyl)2,2', D-Dpr(beta-Z)4,4']GS, which was synthesized by conventional method in solution. An analog [delta Ala4,4']GS was synthesized from [L-Orn(delta-Boc)2,2', D-Dpr4,4']GS through Hofmann degradation of the D-Dpr residues. Antimicrobial activities of these analogs were tested; [D-Dpr(beta-Z)4,4']GS and [delta Ala4,4']GS showed high antimicrobial activities against Gram-positive bacteria. [D-Dpr4,4']-GS showed an appreciable activity against Gram-negative bacteria such as Escherichia coli. Four semigramicidin S (semiGS) analogs such as [delta Ala4]semiGS were synthesized; these had no antimicrobial activity. Analogs containing delta Ala residues were hydrogenated, and the formation of L-Ala or D-Ala residues was determined. The delta Ala residues in [delta Ala4,4'] GS were reduced to DL-Ala, and delta Ala in [delta Ala4]semiGS mostly to L-Ala. The relationships of the antimicrobial activity, CD curves and asymmetric hydrogenation to the structure were discussed.
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