| Abstrakt: |
It was found that under conditions of a short-term cultivation of the Co-deficient mycelium of M. purpurea var. violaces 1935 in the synthetic medium the level of gentamicin biosynthesis increased on the average by 2--2.5 times when cyancobalamine, methylcobalamine, L-methionine or L-serine were added to the medium. Glycine and H2-pholate increased the gentamicin yield on the average by 1.5--1.8 times. When the concentration of L-methionine in the medium was optimal, production of gentamicin by the Co-deficient mycelium markedly increased on addition of extra amounts of cyancobalamine into the medium. An analogous high level of gentamicin biosynthesis was observed in the absence of L-methionine, when combinations of H2-pholate and L-serine or cyancobalamine, H2-pholate and glycine were added to the medium. The data of the study indicate that the pholate-dependent neogenesis of -CH3 group and the methyl-B12-dependent resynthesis of L-methionine play an important functional role in biosynthesis of gentamicin. |
