Add time:07/18/2019         Source:sciencedirect.com

A previous paper indicated that corynomycolates synthesized by the fluffy layer fraction prepared from Corynebacterium matruchotii cells appeared exclusively as α-trehalose 6-monocorynomycolate (TMM) (T. Shimakata, K. Tsubokura, T. Kusaka, and K. Shizukuishi, 1985, Arch. Biochem. Biophys. 238, 497–508). In the present communication, the role of trehalose in the synthesis and subsequent metabolism of corynomycolic acid (cas 18951-35-4)s was reexamined. Consequently the following facts were clarified: (i) trehalose 6-phosphate (T-6-P), but not trehalose, stimulated corynomycolate synthesis from palmitate in the presence of ATP; the immediate product was TMM, which showed a rapid turnover. Since the turnover was blocked by addition of α-trehalose, only TMM accumulated among corynomycolate-containing substances. These results strongly suggested that T-6-P is an essential component as the acceptor in corynomycolate-synthetic system; (ii) TMM was the precursor not only to α-trehalose 6,6′-dicorynomycolate (TDM) and free corynomycolic acids but also to cell wall corynomycolate; (iii) addition of α-trehalose blocked the transfer of the corynomycolate moiety from TMM to cell wall corynomycolate, TDM, and free corynomycolic acids to a similar extent. These results clearly indicate that trehalose plays an essential role in the metabolism of corynomycolate after Claisen condensation and subsequent reduction in C. matruchotii.

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