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  • 1
    ISSN: 0170-2041
    Keywords: Dipeptide antibiotic ; Dihydroxyhomoproline ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Das Dipeptidantibiotikum N-Valyl-dihydroxyhomoprolin: Isolierung, Charakterisierung und antimikrobielle AktivitätenDas Dipeptidantibiotikum N-Valyl-dihydroxyhomoprolin (Val-Dhp, 1) wurde aus dem Kulturfiltrat von Streptomyces antibioticus ssp. antibioticus Tü 1718 mittels Gelchromatographie und HPLC isoliert. Die Reinigung sowie die chemische und spektroskopische Charakterisierung wurden durch komplizierte Gleichgewichte zwischen unterschiedlichen Formen des stark hydrophilen Antibiotikums erschwert. Das Dipeptidantibiotikum kristallisiert in dünnen Nadeln. 1 enthält N-terminal L-Valin, das mit einer neuen, mit L-4-Hydroxyprolin verwandten Dihydroxyiminosäure verknüpft ist. Die Ergebnisse von 1H-NMR, 13C-NMR, Massenspektren (GC-MS, FD) und der Vergleich mit synthetischem L-Valyl-L-hydroxyprolin sind in Einklang mit dem Strukturvorschlag 2-[1-(2-Amino-3-methyl-1-oxobutyl)-4-hydroxy-2-pyrrolidinyl]-2-hydroxyethan
    Notes: The dipeptide antibiotic N-valyl-dihydroxyhomoproline (Val-Dhp, 1) was isolated from the culture filtrate of Streptomyces antibioticus ssp. antibioticus Tü 1718 by gel chromatography and HPLC. The purification, chemical, and spectroscopic characterization were hampered by complex equilibria between different forms of the highly hydrophilic antibiotic. The dipeptidic antibiotic crystallizes in thin needles. 1 consists of N-terminal L-valine coupled to a new dihydroxyimino acid related to L-hydroxyproline. The results of 1H NMR, 13C NMR, mass (GC-MS, FD) spectra and the comparison with synthetic L-valyl-L-hydroxyproline are consistent with the proposed structure 2-[1-(2-amino-3-methyl-1-oxobutyl)-4-hydroxy-2-pyrrolidinyl]-2-hydroxyetha-noic acid. N-Valyl-dihydroxyhomoproline is active against Escherichia coli K 12, Corynebacterium spec., and Serratia marcescens.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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