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- W1512554562 abstract "The genes encoding the two different subunits of the electron transfer flavoprotein (ETF) from the methylotrophic bacterium W3A1 have been identified, cloned, and sequenced. A 0.8-kilobase pair DNA fragment was generated for use as a molecular probe by the amplification of genomic sequences using the polymerase chain reaction and a primer pair with degenerate sequences derived from the NH2-terminal amino acid sequences determined for the ETF subunits purified from W3A1. The screening of a partial genomic minilibrary containing size-selected BamHI-SalI fragments using this probe identified a 2.2-kilobase pair insert containing the complete coding sequences for both W3A1 ETF subunits. The genes are arranged in tandem in the genomic DNA with only 2 bases between the TAG translation termination codon of the small subunit and the ATG translation initiation codon of the large subunit. The deduced amino acid sequences of each of the W3A1 ETF subunits exhibit only approximately 30% identity with the corresponding subunits of the ETF from human, rat, and Paracoccus denitrificans, which as a group are greater than 50% identical. Thus, the ETF from W3A1 may exhibit some unique structural features that, like other differences in some of its physical and functional properties, may distinguish this ETF from others in this family. A highly homologous region near the COOH terminus of the large subunit in all the ETF proteins was found to contain a sequence that matches in several ways the ADP-binding motif of flavoproteins and other dinucleotide-binding proteins, suggesting that the large subunit forms a portion of the FAD (or AMP) binding site in these proteins. Under control of the tac promoter, the cloned ETF subunit genes were co-expressed in Escherichia coli producing the heterodimeric holoprotein with physical, spectral, and electron-accepting properties essentially identical to the ETF isolated from W3A1. The recombinant ETF serves as the electron acceptor for W3A1 trimethylamine dehydrogenase in vitro, accumulating as the air-stable anionic semiquinone in the presence of excess trimethylamine. Fully reduced ETF could not be obtained even after prolonged enzymatic reduction." @default.
- W1512554562 created "2016-06-24" @default.
- W1512554562 creator A5047337858 @default.
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- W1512554562 date "1994-12-01" @default.
- W1512554562 modified "2023-09-30" @default.
- W1512554562 title "Cloning, sequence analysis, and expression of the genes encoding the two subunits of the methylotrophic bacterium W3A1 electron transfer flavoprotein." @default.
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- W1512554562 doi "https://doi.org/10.1016/s0021-9258(18)31609-0" @default.
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