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. 1987 Apr;169(4):1398–1402. doi: 10.1128/jb.169.4.1398-1402.1987

Nickel uptake in Bradyrhizobium japonicum.

L W Stults, S Mallick, R J Maier
PMCID: PMC211959  PMID: 3558318

Abstract

Free-living Bradyrhizobium japonicum grown heterotrophically with 1 microM 63Ni2+ accumulated label. Strain SR470, a Hupc mutant, accumulated almost 10-fold more 63Ni2+ on a per-cell basis than did strain SR, the wild type. Nongrowing cells were also able to accumulate nickel over a 2-h period, with the Hupc mutant strain SR470 again accumulating significantly more 63Ni2+ than strain SR. These results suggest that this mutant is constitutive for nickel uptake as well as for hydrogenase expression. The apparent Kms for nickel uptake in strain SR and strain SR470 were found to be similar, approximately 26 and 50 microM, respectively. The Vmax values, however, were significantly different, 0.29 nmol of Ni/min per 10(8) cells for SR and 1.40 nmol of Ni/min per 10(8) cells for SR470. The uptake process was relatively specific for nickel; only Cu2+ and Zn2+ (10 microM) were found to appreciably inhibit the uptake of 1 microM Ni, while a 10-fold excess of Mg2+, Co2+, Fe3+, or Mn2+ did not affect Ni2+ uptake. The lack of inhibition by Mg2+ indicates that nickel is not transported by a magnesium uptake system. Nickel uptake was also inhibited by cold (53% inhibition at 4 degrees C) and slightly by the ionophores nigericin and carbonyl cyanide m-chlorophenylhydrazone. Other ionophores did not appreciably affect nickel uptake, even though they significantly stimulated O2 uptake. The cytochrome c oxidase inhibitors azide, cyanide, and hydroxylamine did not inhibit Ni2+ uptake, even at concentrations (of cyanide and hydroxylamine) that inhibited O2 uptake. The addition of oxidizable substrates such as succinate or gluconate did not increase nickel uptake, even though they increased respiratory activity. Nickel update showed a pH dependence with an optimum at 6.0. Most (approximately 85%) of the 63Ni2+ taken up in 1 min by strain SR470 was not exchangeable with cold nickel.

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Selected References

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