Murakami T, Takahashi Y, Fukushi E, Kawabata J, Hashimoto M, Okuno T, Harada Y. Biosynthesis of Lambertellols Based on the High Specific Incorporation of the 13C-Labeled Acetates and Their Biological Properties.
J Am Chem Soc 2004;
126:9214-20. [PMID:
15281810 DOI:
10.1021/ja048345v]
[Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Biosyntheses of lambertellols A (1) and B (2) as well as lambertellin (3) were investigated by isotope labeling experiments. Nearly 40% of specific incorporation of [1,2-(13)C(2)]acetate was achieved, and all the carbons in 1 and 2 were labeled. This high incorporation of the labeled acetate was realized by providing INADEQUATE spectra by employing only 0.4 and 0.7 mg of 1 and 2, respectively. Our studies revealed that 1-3 are biogenetically synthesized via loss of two carbons from octameric acetate. A biological assay against Monilinia fructicola revealed those remarkably inhibited hyphal germinations. However, neither of them killed the spores immediately, even in high concentration. These conditions induced the formation of microconidia.
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