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  • Organic Chemistry  (3)
  • General Chemistry
  • Molecular Sequence Data
  • 1985-1989  (3)
  • 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.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1168-1174 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Tetrahydrofuranic Acids Substituted in Position 2 and 5A synthesis of the 3,6-epoxyalkane diacids 9a-d previously detected in human urine is described.
    Notes: Eine Synthese der kürzlich in Humanurin aufgefundenen 3,6-Epoxyalkandisäuren 9a-d wird beschrieben.
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  • 3
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Amiclenomycin-Peptide - Isolierung und Strukturaufklärung neuer Biotin-AntimetabolitenSechs Peptidantibiotika wurden aus dem Kulturfiltrat von Streptomyces venezuelae Tü 2460 isoliert. Der 4-Amino-2,5-cyclohexadienyl-Ring der Aminosäure Amiclenomycin (Acm, 7) wurde als essentielles Strukturelement in den drei Dipeptiden L-MeIle-L-Acm (1, Stravidin S3), L-Ile-L-Acm (2) und L-MeVal-L-Acm (3, Stravidin S2) sowie in den drei Tripeptiden l-Melle-l-Acm-l-Gln(4), L-lle-l-Acm-l-Gln(5)und l-val-l-Acm-l-Gln(6)ermittelt.Zudem wurden l-Amiclenomycin(7)und L-Acm-l-Gln(8)durch enzymatische Spaltung mit Pronase p erhalten.Alle acht Antibiotika hemmen das Wachstum gramnegativer Bakterien durch Blockade der Biotinbiosynthese.Eine synergistische Verstärkung der Antibiotikawirkung wurde durch ein ebenfalls aus s.venezuelae Tü 2460isoliertes polypeptid L(9)erzielt. Eine weitere Untersuchung#)ergab, daß der S.-venezuelae-Stamm Tü 2605 das Antibiotikum l-MeIle-l-Glu(10)produziert.
    Notes: Six peptide antibiotics were isolated from the culture filtrate of Streptomyces venezuelae Tü 2460. The 4-amino-2,5-cyclohexadienyl ring of the amino acid amiclenomycin (Acm, 7) was found to be the essential structural element of the three dipeptides L-MeIle-L-Acm (1, stravidin S3), L-Ile-L-Acm (2), and L-MeVal-L-Acm (3, stravidin S2) as well as the three tripeptides L-MeIle-L-Acm-L-Gln (4), L-Ile-L-Acm-L-Gln (5) and L-Val-L-Acm-L-Gln (6). In addition L-amiclenomycin (7) and L-Acm-L-Gln (8) were obtained by enzymatic cleavage with pronase P. All eight antibiotics inhibit the growth of gram-negative bacteria by blocking the biotin biosynthesis. A synergistic enhancement of the antibiotic action was found by a polypeptide L (9) also isolated from S. Venezuelae Tü 2460. Further screeningSupplemented on correction(Nov. 7,1985). revealed, that the S. Venezuelae strain Tü 2605 produces the antibiotic L-MeIle-L-Acm-L-Glu (10).
    Additional Material: 3 Ill.
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