Biosynthesis of lipstatin. Incorporation of multiply deuterium-labeled (5Z,8Z)-tetradeca-5,8-dienoic acid and octanoic acid. |
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Authors: | M Goese W Eisenreich E Kupfer P Stohler W Weber H G Leuenberger A Bacher |
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Institution: | Lehrstuhl für Organische Chemie und Biochemie, Technische Universit?t München, Lichtenbergstr. 4, D-85747 Garching, Federal Republic of Germany. |
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Abstract: | Fermentation experiments with Streptomyces toxytricini were performed using (5Z,8Z)-10,11,12,12-(2)H]tetradeca-5,8-dienoic acid or a mixture of 2,2-(2)H(2)]- and 8,8,8-(2)H(3)]octanoic acid as supplements. (2)H NMR and mass spectroscopy confirmed the incorporation of (5Z,8Z)-10,11,12,12-(2)H]tetradeca-5,8-dienoic acid into the C(13) side chain as well as into the C(6) side chain of lipstatin. Moreover, deuterium was incorporated into the C(6) side chain of lipstatin from the 8-position but not from the 2-position of octanoate. The data establish that the beta-lactone moiety of lipstatin is formed by condensation of a C(8) and a C(14) fatty acid with a concomitant exchange of the H-2 atoms of the C(8) fatty acid. |
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