Journal of Antibiotics p. 58 - 62 (2000)
Update date:2022-08-17
Topics:
Kanzaki, Hiroshi
Imura, Daisuke
Nitoda, Teruhiko
Kawazu, Kazuyoshi
Albornoursin production was greatly enhanced when cycle (r-Leu-L-Phe) (CFL), a tetrahydro derivative of albonoursin, was added to the 2-day culture of an albonoursin-producing actinomycete, Streptomyces albulus KO-23. The increase in albonoursin production paralleled the amount of CFL added. Furthermore, the resting cells of the strain catalyzed the bioconversion of CFL to albonoursin. The optimum pH and temperature for the conversion were found to be pH 10.0 and 50°C. The feeding experiments and the resting-cell reactions revealed that albonoursin is biosynthesized by dehydrogenation of CFL in the actinomycete. This is the first report for a dehydrogenation of amino acid residues at the α,β-positions in cyclic dipeptides.
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