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. 1988 Sep;170(9):3891–3896. doi: 10.1128/jb.170.9.3891-3896.1988

Nickel affects expression of the nickel-containing hydrogenase of Alcaligenes latus.

C M Doyle 1, D J Arp 1
PMCID: PMC211386  PMID: 3045080

Abstract

The effects of nickel on the expression of hydrogenase in the hydrogen-oxidizing bacterium Alcaligenes latus were studied. In the absence of added nickel, both hydrogenase activity, measured as O2-dependent H2 uptake, and hydrogenase protein, measured in a Western immunoblot, were very low compared with the levels in cells induced for hydrogenase in the presence of nickel. Hydrogenase activity and protein levels were dependent on the added nickel concentration and were saturated at 30 nM added Ni2+. The amount of hydrogenase protein in a culture at a given nickel concentration was calculated from the H2 uptake activity of the culture at that Ni2+ concentration. Between 0 and 30 nM added Ni2+, the amount of hydrogenase protein (in nanomoles) was stoichiometric with the amount of added Ni2+. Thus, all of the added Ni2+ could be accounted for in hydrogenase. Between 0 and 50 nM added Ni2+, all the Ni present in the cultures was associated with the cells after 12 h; above 50 nM added Ni2+, some Ni remained in the medium. No other divalent metal cations tested were able to substitute for Ni2+ in the formation of active hydrogenase. We suggest two possible mechanisms for the regulation of hydrogenase activity and protein levels by nickel.

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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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