Biosynthesis of the antitumor antibiotic sparsomycin
作者:Ronald J. Parry、Yan Li、Elizabeth Eudy Gomez
DOI:10.1021/ja00041a007
日期:1992.7
The biosynthesis of the antitumor antibiotic sparsomycin (1) has been investigated by administration of isotopically labeled precursors to Streptomyces sparsogenes var. sparsogenes. These studies indicated that the dithioacetal moiety (2) of sparsomycin is derived from L-cysteine via the intermediacy of 5-methylcysteine and S-(methylthiomethyl)cysteine, with reduction of the carboxyl group of 5-(m
Synthesis of sparsomycin derivatives, addressing its binding to the large ribosomal subunit
作者:L. A. G. M. van den Broek、A. J. J. Antonisse、H. C. J. Ottenheijm、A. San Felix、E. Lázaro、J. P. G. Ballesta、P. Lelieveld
DOI:10.1002/recl.19921110401
日期:——
Apparently, the uracil ring plays an important role in the interaction of sparsomycin with the ribosomal peptidyl transferase and its unmodified presence is crucial for displaying activity. The photoprobes, carrying modifications in the “eastern C” fragment of 1, do interact with the ribosome, but less effectively than sparsomycin itself.
Facile syntheses of sparsomycin (3) and its four analogues (4-7) based on diastereoselective oxidation of sulfide, sulfenylation, and coupling of 6-methyluracylacryllic acid with monooxodithioacetal amine, are described. Studies on the biological activity of morphological reversion on srcts-NRK cells were also carried out.