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Issue 12, 2013
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Sinorhizobium meliloti Nia is a P1B-5-ATPase expressed in the nodule during plant symbiosis and is involved in Ni and Fe transport

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Abstract

The P1B-ATPases are a ubiquitous family of metal transporters. These transporters are classified into subfamilies on the basis of substrate specificity, which is conferred by conserved amino acids in the last three transmembrane domains. Five subfamilies have been identified to date, and representative members of four (P1B-1 to P1B-4) have been studied. The fifth family (P1B-5), of which some members contain a C-terminal hemerythrin (Hr) domain, is less well characterized. The S. meliloti Sma1163 gene encodes for a P1B-5-ATPase, denoted Nia (Nickel–iron ATPase), that is induced by exogenous Fe2+ and Ni2+. The nia mutant accumulates nickel and iron, suggesting a possible role in detoxification of these two elements under free-living conditions, as well as in symbiosis, when the highest expression levels are measured. This function is supported by an inhibitory effect of Fe2+ and Ni2+ on the pNPPase activity, and by the ability of Nia to bind Fe2+ in the transmembrane domain. Optical and X-ray absorption spectroscopic studies of the isolated Hr domain confirm the presence of a dinuclear iron center and suggest that this domain might function as an iron sensor.

Graphical abstract: Sinorhizobium meliloti Nia is a P1B-5-ATPase expressed in the nodule during plant symbiosis and is involved in Ni and Fe transport

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Publication details

The article was received on 12 Jul 2013, accepted on 02 Sep 2013 and first published on 03 Sep 2013


Article type: Paper
DOI: 10.1039/C3MT00195D
Citation: Metallomics, 2013,5, 1614-1623
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    Sinorhizobium meliloti Nia is a P1B-5-ATPase expressed in the nodule during plant symbiosis and is involved in Ni and Fe transport

    E. L. Zielazinski, M. González-Guerrero, P. Subramanian, T. L. Stemmler, J. M. Argüello and A. C. Rosenzweig, Metallomics, 2013, 5, 1614
    DOI: 10.1039/C3MT00195D

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