Mode of action of the biotin antimetabolites actithiazic acid and alpha-methyldethiobiotin.

Abstract:

:Actithiazic acid and alpha-methyldethiobiotin inhibited the conversion of dethiobiotin to biotin resting-cell suspensions of Escherichia coli. The concentrations which effected 50% inhibition were 0.45 and 1.1 microM for actithiazic acid and alpha-methyldethiobiotin, respectively. Cells grown in low concentrations of the two biotin antimetabolites showed derepression of the biotin A operon, as evidenced by the enhanced levels of the enzymes 7,8-diaminopelargonic acid aminotransferase and dethiobiotin synthetase. Derepression was not due to any direct regulatory effect of the antibiotics but was the consequence of the inhibition of the biotin synthetase enzyme; this inhibition prevented the intracellular concentration of biotin from reaching the levels required for normal regulation of the biotin A operon.

authors

Eisenberg MA,Hsiung SC

doi

10.1128/aac.21.1.5

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

5-10

issue

1

eissn

0066-4804

issn

1098-6596

journal_volume

21

pub_type

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