Stereochemical studies on the biosynthesis of the αβ-didehydro-amino-acid units of mycelianamide, cyclopenin, and cyclopenol
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 14,p. 1564-1567
- https://doi.org/10.1039/p19760001564
Abstract
Feeding experiments with tyrosine, stereoselectively labelled with tritium at C-3, in Penicillium griseofulvum have shown that formation of the αβ-didehydro-amino-acid units of mycelianamide proceeds with high retention of the pro-R- and virtually complete loss of the pro-S-methylene hydrogen atom of the precursor. Analogous studies were conducted with phenylalanine in Penicillium cyclopium. Incorporation of [3-3H]phenylalanine into the secondary metabolites, cyclopenin and cyclopenol, occurred with >50%(typically 65%) loss of tritium, irrespective of the tritium configuration at C-3. This non-stereospecific loss is attributed to an exchange process preceding entry of the precursors into the secondary metabolic pathway. In accord with this, incorporation of [3H]phenyl-alanine into mycelial protein took place with substantial loss of tritium from C-3 and almost complete loss from C-2.Keywords
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