Abstract
In Alcaligenes eutrophus H16 a pleiotropic DNA-region is involved in formation of catalytically active hydrogenases. This region lies within the hydrogenase gene cluster of megaplasmid pHG1. Nucleotide sequence determination revealed five open reading frames with significant amino acid homology to the products of the hyp operon of Escherichia coli and other hydrogenase-related gene products of diverse organisms. Mutants of A. eutrophus H16 carrying Tn5 insertions in two genes (hypB and hypD) lacked catalytic activity of both soluble (SH) and membrane-bound (MBH) hydrogenase. Immunological analysis showed that the mutants contained SH-and MBH-specific antigen. Growing the cells in the presence of 63Ni2+ yielded significantly lower nickel accumulation rates of the mutant strains compared to the wild-type. Analysis of partially purified SH showed only traces of nickel in the mutant protein suggesting that the gene products of the pleiotropic region are involved in the supply and/or incorporation of nickel into the two hydrogenases of A. eutrophus.
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Dernedde, J., Eitinger, M. & Friedrich, B. Analysis of a pleiotropic gene region involved in formation of catalytically active hydrogenases in Alcaligenes eutrophus H16. Arch. Microbiol. 159, 545–553 (1993). https://doi.org/10.1007/BF00249034
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DOI: https://doi.org/10.1007/BF00249034