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• W2104637963 endingPage "1854" @default.
• W2104637963 startingPage "1845" @default.
• W2104637963 abstract "Random Tn5 mutagenesis of the regulatory region of megaplasmid pHG1 of Alcaligenes eutrophus led to the identification of three distinct loci designated hoxA, hoxD, and hoxE. Sequencing of the hoxA locus revealed an open reading frame which could code for a polypeptide of 482 amino acids with a molecular mass of 53.5 kDa. A protein of comparable apparent molecular mass was detected in heterologous expression studies with a plasmid-borne copy of the hoxA gene. Amino acid alignments revealed striking homologies between HoxA and the transcriptional activators NifA and NtrC of Klebsiella pneumoniae and HydG of Escherichia coli. HoxA- mutants of A. eutrophus lacked both NAD-reducing soluble hydrogenase and membrane-bound hydrogenase. In HoxA- mutants, the synthesis of beta-galactosidase from a hoxS'-'lacZ operon fusion was drastically reduced, indicating that HoxA is essential for the transcription of hydrogenase genes. Mutants defective in hoxD and hoxE also lacked the catalytic activities of the two hydrogenases; however, in contrast to HoxA- mutants, they contained immunologically detectable NAD-reducing soluble hydrogenase and membrane-bound hydrogenase proteins, although at a reduced level. The low hydrogenase content in the HoxD- and HoxE- mutants correlated with a decrease in beta-galactosidase synthesized under the direction of a hoxS'-'lacZ operon fusion. Thus, hoxD and hoxE apparently intervene both in the regulation of hydrogenase synthesis and in subsequent steps leading to the formation of catalytically active enzymes." @default.
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• W2104637963 creator A5065440088 @default.
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• W2104637963 date "1991-03-01" @default.
• W2104637963 modified "2023-09-26" @default.
• W2104637963 title "Three trans-acting regulatory functions control hydrogenase synthesis in Alcaligenes eutrophus" @default.
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• W2104637963 doi "https://doi.org/10.1128/jb.173.6.1845-1854.1991" @default.
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