Biotin synthase, a new member of the family of enzymes which uses S-adenosylmethionine as a source of deoxyadenosyl radical - PubMed (original) (raw)
. 1997 Jul 18;236(2):402-6.
doi: 10.1006/bbrc.1997.6952.
Affiliations
- PMID: 9240449
- DOI: 10.1006/bbrc.1997.6952
Biotin synthase, a new member of the family of enzymes which uses S-adenosylmethionine as a source of deoxyadenosyl radical
D Guianvarc'h et al. Biochem Biophys Res Commun. 1997.
Erratum in
- Biochem Biophys Res Commun 1997 Nov 7;240(1):246
Abstract
The fact that biotin synthase, from Escherichia coli and Bacillus sphaericus, requires S-adenosylmethionine and a reducing system led us to postulate that this synthase could belong to the family of enzymes which use S-adenosylmethionine as a source of deoxyadenosyl radical, namely pyruvate formate-lyase, lysine 2,3-aminomutase, and anaerobic ribonucleotide reductase. We describe here experiments with S-[2,8-(3)H] adenosylmethionine and S-adenosyl-[methyl-3H]methionine which allowed the identification and quantification of the expected cleavage products, deoxyadenosine, and methionine. They are formed in equimolar amounts, in a ratio close to 3 with respect to the biotin produced. We postulate a mechanism involving the homolytic cleavage of two C-H bonds which should consume two equivalents of S-adenosylmethionine. The observed excess of S-adenosylmethionine consumption is attributed to abortive processes.
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