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. 1992 Nov;56(11):1780-5.
doi: 10.1271/bbb.56.1780.

Conversion of dethiobiotin to biotin in cell-free extracts of Escherichia coli

O Ifuku  1 , J Kishimoto, S Haze, M Yanagi, S Fukushima
Affiliations
Free article

Conversion of dethiobiotin to biotin in cell-free extracts of Escherichia coli

O Ifuku et al. Biosci Biotechnol Biochem. 1992 Nov.
Free article

Abstract

We constructed the plasmid pTTB151 in which the E. coli bioB gene was expressed under the control of the tac promoter. Conversion of dethiobiotin to biotin was demonstrated in cell-free extracts of E. coli carrying this plasmid. The requirements for this biotin-forming reaction included fructose-1,6-bisphosphate, Fe2+, S-adenosyl-L-methionine, NADPH, and KCl, as well as dethiobiotin as the substrate. The enzymes were partially purified from cell-free extracts by a procedure involving ammonium sulfate fractionation. Our results suggest that an unidentified enzyme(s) besides the bioB gene product is obligatory for the conversion of dethiobiotin to biotin.

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