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    J Biol Chem. 1991 Nov 25;266(33):22380-5.

    Nitrate-inducible formate dehydrogenase in Escherichia coli K-12. I. Nucleotide sequence of the fdnGHI operon and evidence that opal (UGA) encodes selenocysteine.

    Berg BL, Li J, Heider J, Stewart V.

    Section of Microbiology, Cornell University, Ithaca, New York 14853-8101.

    The fdnGHI operon of Escherichia coli encodes nitrate-inducible formate dehydrogenase. We report here the entire nucleotide sequence of fdnGHI. The sequence contains three open reading frames of sizes appropriate to encode the three subunits of formate dehydrogenase-N. fdnG contains an in-frame UGA codon that specifies selenocysteine incorporation, and the predicted amino acid sequence of FdnG shows similarity to two other bacterial formate dehydrogenase enzymes. FdnH contains 4 cysteine clusters typical of those found in iron-sulfur proteins. FdnG also contains a cysteine cluster. Evidence from sequence and spectral analyses suggest that FdnI encodes cytochrome bFdn556. Implications for the membrane topology of formate dehydrogenase-N and its mechanism of proton translocation are discussed.

    PMID: 1834669 [PubMed - indexed for MEDLINE]

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