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The Plant Cell, Vol. 13, 2761-2775, December 2001, Copyright © 2001,
American Society of Plant Biologists

A Novel Family of Magnesium Transport Genes in Arabidopsis

Legong Li1,a, Ana F. Tutone1,b, Revel S. M. Drummondb, Richard C. Gardner2,b and Sheng Luan2,a

a Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
b School of Biological Sciences, University of Auckland, Auckland, New Zealand

2 To whom correspondence should be addressed. E-mail r.gardner{at}auckland.ac.nz or sluan{at}nature.berkeley.edu; fax 649-373-7416 (Gardner) or 510-642-4995 (Luan)

Magnesium (Mg2+) is the most abundant divalent cation in plant cells and plays a critical role in many physiological processes. We describe the identification of a 10-member Arabidopsis gene family (AtMGT) encoding putative Mg2+ transport proteins. Most members of the AtMGT family are expressed in a range of Arabidopsis tissues. One member of this family, AtMGT1, functionally complemented a bacterial mutant lacking Mg2+ transport capability. A second member, AtMGT10, complemented a yeast mutant defective in Mg2+ uptake and increased the cellular Mg2+ content of starved cells threefold during a 60-min uptake period. 63Ni tracer studies in bacteria showed that AtMGT1 has highest affinity for Mg2+ but may also be capable of transporting several other divalent cations, including Ni2+, Co2+, Fe2+, Mn2+, and Cu2+. However, the concentrations required for transport of these other cations are beyond normal physiological ranges. Both AtMGT1 and AtMGT10 are highly sensitive to Al3+ inhibition, providing potential molecular targets for Al3+ toxicity in plants. Using green fluorescence protein as a reporter, we localized AtMGT1 protein to the plasma membrane in Arabidopsis plants. We suggest that the AtMGT gene family encodes a Mg2+ transport system in higher plants.




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