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Selenophosphate Synthetase.

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    Selenophosphate synthetase (selD) is crucial for incorporating selenocysteine into proteins. This enzyme, studied in E. coli, catalyzes essential selenium metabolism, with recent studies revealing an unusual optical absorption spectrum.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Selenophosphate synthetase (selD gene product) from E. coli is vital for selenocysteine insertion into proteins via TGA codons.
    • Mutant E. coli lacking selD show impaired selenium incorporation into formate dehydrogenase and selenouridine residues on tRNA.
    • Selenophosphate is implicated as a key intermediate in E. coli selenium metabolic pathways.

    Purpose of the Study:

    • To investigate the role and mechanism of selenophosphate synthetase in selenium metabolism.
    • To characterize the enzymatic activity and properties of purified selenophosphate synthetase.
    • To explore conserved regions in selenophosphate synthetase genes across different organisms.

    Main Methods:

    • In vivo and in vitro studies using E. coli mutants.
    • Enzyme assays measuring AMP formation to study reaction mechanisms and inhibition.
    • Gene sequencing of selenophosphate synthetase from various organisms.
    • Spectroscopic analysis of purified selenophosphate synthetase.

    Main Results:

    • E. coli selD mutants demonstrate a failure to incorporate selenium into selenoproteins and selenouridine-modified tRNAs.
    • Selenophosphate synthetase catalyzes the formation of selenophosphate (SePO3) from reduced selenium and ATP.
    • An uncoupled reaction reveals selenophosphate synthetase can hydrolyze ATP to AMP and orthophosphate.
    • Sequencing identified conserved regions in the enzyme across species.
    • Purified selenophosphate synthetase exhibits an unusual optical absorption spectrum.

    Conclusions:

    • Selenophosphate synthetase is essential for selenocysteine incorporation and selenium metabolism in E. coli.
    • The enzyme's mechanism involves ATP hydrolysis and selenophosphate formation.
    • Conserved regions suggest functional importance across diverse organisms.
    • The observed optical spectrum indicates novel properties of selenophosphate synthetase requiring further investigation.