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Nucleotide Sequence Of A Gene From The Pseudomonas Transposon Tn501 Encoding Mercuric Reductase.

N. Brown, S. J. Ford, R. Pridmore, D. Fritzinger
Published 1983 · Chemistry, Medicine

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We have determined the nucleotide sequence of the merA gene from the mercury-resistance transposon Tn501 and have predicted the structure of the gene product, mercuric reductase. The DNA sequence predicts a polypeptide of Mr 58 660, the primary structure of which shows strong homologies to glutathione reductase and lipoamide dehydrogenase, but mercuric reductase contains as additional N-terminal region that may form a separate domain. The implications of these comparisons for the tertiary structure and mechanism of mercuric reductase are discussed. The DNA sequence presented here has an overall G+C content of 65.1 mol%, typical of the bulk DNA of Pseudomonas aeruginosa from which Tn501 was originally isolated. Analysis of the codon usage in the merA gene shows that codons with C or G at the third position are preferentially utilized.
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