Abstract
Nickel-deficient (Nic-) mutants of Alcaligenes eutrophus requiring high levels of nickel ions for autotrophic growth with hydrogen were characterized. The Nic- mutants carried defined deletions in the hydrogenase gene cluster of the indigenous pHG megaplasmid. Nickel deficiency correlated with a low level of the nickel-containing hydrogenase activity, a slow rate of nickel transport, and reduced activity of urease. The Nic+ phenotype was restored by a cloned DNA sequence (hoxN) of a megaplasmid pHG1 DNA library of A. eutrophus H16. hoxN is part of the hydrogenase gene cluster. The nickel requirement of Nic- mutants was enhanced by increasing the concentration of magnesium. This suggests that the Nic- mutants are impaired in the nickel-specific transport system and thus depend on the second transport activity which normally mediates the uptake of magnesium.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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