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. 1976 Jun;126(3):1030–1036. doi: 10.1128/jb.126.3.1030-1036.1976

Pathway of thiamine pyrophosphate synthesis in Micrococcus denitrificans.

H Sanemori, Y Egi, T Kawasaki
PMCID: PMC233122  PMID: 181359

Abstract

The pathway of thiamine pyrophosphate (TPP) biosynthesis, which is formed either from exogeneously added thiamine or from the pyrimidine and thiazole moieties of thiamine, in Micrococcus denitrificans was investigated. The following indirect evidence shows that thiamine pyrophosphokinase (EC 2.7.6.2) catalyzes the synthesis of TPP from thiamine: (i) [35S]thiamine incubated with cells of this microorganism was detected in the form of [35S]thiamine; (ii) thiamine gave a much faster rate of TPP synthesis than thiamine monophosphate (TMP) when determined with the extracts; and (iii) a partially purified preparation of the extracts can use thiamine, but not TMP, as the substrate. The activities of the four enzymes involved in TMP synthesis from pyrimidine and thiazole moieties of thiamine were detected in the extracts of M. denitrificans. The extracts contained a high activity of the phosphatase, probably specific for TMP. After M. denitrificans cells were grown on a minimal medium containing 3 mM adenosine, which causes derepression of de novo thiamine biosynthesis in Escherichia coli, the activities of the four enzymes involved with TMP synthesis, the TMP phosphatase, and the thiamine pyrophosphokinase were enhanced two- to threefold. These results indicate that TPP is synthesized directly from thiamine without forming TMP as an intermediate and that de novo synthesis of TPP from the pyrimidine and thiazole moieties involves the formation of TMP, followed by hydrolysis to thiamine, which is then converted to TPP directly. Thus, the pathway of TPP synthesis from TMP synthesized de novo in M. denitrificans is different from that found in E. coli, in which TMP synthesized de novo is converted directly to TPP without producing thiamine.

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Selected References

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