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J Bacteriol. 1994 June; 176(12): 3544-3551

research-article

Identification of the genes encoding NAD(P)H-flavin oxidoreductases that are similar in sequence to Escherichia coli Fre in four species of luminous bacteria: Photorhabdus luminescens, Vibrio fischeri, Vibrio harveyi, and Vibrio orientalis.

Department of Biophysics and Biochemistry, School of Science, University of Tokyo, Japan.

ABSTRACT

Genes encoding NAD(P)H-flavin oxidoreductases (flavin reductases) similar in both size and sequence to Fre, the most abundant flavin reductase in Escherichia coli, were identified in four species of luminous bacteria, Photorhabdus luminescens (ATCC 29999), Vibrio fischeri (ATCC 7744), Vibrio harveyi (ATCC 33843), and Vibrio orientalis (ATCC 33934). Nucleotide sequence analysis showed Fre-like flavin reductases in P. luminescens and V. fischeri to consist of 233 and 236 amino acids, respectively. As in E. coli Fre, Fre-like enzymes in luminous bacteria preferably used riboflavin as an electron acceptor when NADPH was used as an electron donor. These enzymes also were good suppliers of reduced flavin mononucleotide (FMNH2) to the bioluminescence reaction. In V. fischeri, the Fre-like enzyme is a minor flavin reductase representing < 10% of the total FMN reductase. That the V. fischeri Fre-like enzyme has no appreciable homology in amino acid sequence to the major flavin reductase in V. fischeri, FRase I, indicates that at least two different types of flavin reductases supply FMNH2 to the luminescence system in V. fischeri. Although Fre-like flavin reductases are highly similar in sequence to luxG gene products (LuxGs), Fre-like flavin reductases and LuxGs appear to constitute two separate groups of flavin-associated proteins.

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