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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1984 May;81(9):2893–2897. doi: 10.1073/pnas.81.9.2893

Mechanism of the inhibition of the gamma-carboxylation of glutamic acid by N-methylthiotetrazole-containing antibiotics.

J J Lipsky
PMCID: PMC345179  PMID: 6585834

Abstract

Antibiotics that contain a 1-N-methyl-5-thiotetrazole (MTT) side group have been associated with hypoprothrombinemia. In a detergent-treated rat liver microsomal system, MTT inhibited the carboxylation of the gamma carbon of glutamic acid, a necessary reaction in the synthesis of four of the clotting factors. In the present work, the inhibition by MTT was found to be slow in onset, with a lag time of 15 min before significant inhibition occurred. A preincubation of MTT with the microsomes decreased the lag time and increased the extent of inhibition. Glutathione at 1 mM was found to markedly decrease the ability of MTT to inhibit this reaction. The disulfide dimer of MTT was a more potent inhibitor of the system than was MTT, with inhibition detected as low as 1 microM dimer. Disulfiram also inhibited the carboxylation system. These results indicate that the sulfhydryl group of MTT is important for the inhibitory effect of MTT and suggest that a slowly formed metabolite of MTT may be directly responsible for the observed inhibition. The inhibitory mechanism of MTT may be analogous to that of disulfiram, which would explain some pharmacologic effects in common with disulfiram. In addition, the in vitro observations presented here and a closer examination of the clinical evidence raise the possibility that MTT-containing antibiotic-induced hypoprothrombinemia may not be a vitamin K reversible phenomenon.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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