Selenium is Mobilized in Vivo from Free Selenocysteine and is Incorporated Specifically into Formate Dehydrogenase H and TRNA Nucleosides

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 2002 Mar 13

PMID 11889101

Citations 9

Authors

Gerard M Lacourciere

Affiliations

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Abstract

Selenophosphate synthetase (SPS), the selD gene product from Escherichia coli, catalyzes the biosynthesis of monoselenophosphate, AMP, and orthophosphate in a 1:1:1 ratio from selenide and ATP. It was recently demonstrated that selenium delivered from selenocysteine by an E. coli NifS-like protein could replace free selenide in the in vitro SPS assay for selenophosphate formation (G. M. Lacourciere, H. Mihara, T. Kurihara, N. Esaki, and T. C. Stadtman, J. Biol. Chem. 275:23769-23773, 2000). During growth of E. coli in the presence of 0.1 microM (75)SeO(3)(2-) and increasing amounts of L-selenocysteine, a concomitant decrease in (75)Se incorporation into formate dehydrogenase H and nucleosides of bulk tRNA was observed. This is consistent with the mobilization of selenium from L-selenocysteine in vivo and its use in selenophosphate formation. The ability of E. coli to utilize selenocysteine as a selenium source for selenophosphate biosynthesis in vivo supports the participation of the NifS-like proteins in selenium metabolism.

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