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The Plant Cell, Vol. 15, 1131-1142, May 2003, Copyright © 2003,
American Society of Plant Biologists

Genes Encoding Proteins of the Cation Diffusion Facilitator Family That Confer Manganese Tolerance

Emmanuel Delhaize1, Tatsuhiko Kataoka2, Diane M. Hebb, Rosemary G. White and Peter R. Ryan

Commonwealth Scientific and Industrial Research Organization Plant Industry, Canberra ACT 2601, Australia

1 To whom correspondence should be addressed. E-mail manny.delhaize{at}csiro.au; fax 61-2-62465000

The yeast Saccharomyces cerevisiae expressing a cDNA library prepared from Stylosanthes hamata was screened for enhanced Mn2+ tolerance. From this screen, we identified four related cDNAs that encode membrane-bound proteins of the cation diffusion facilitator (CDF) family. One of these cDNAs (ShMTP1) was investigated in detail and found to confer Mn2+ tolerance to yeast by internal sequestration rather than by efflux of Mn2+. Expression of ShMTP1 in a range of yeast mutants suggested that it functions as a proton:Mn2+ antiporter on the membrane of an internal organelle. Similarly, when expressed in Arabidopsis, ShMTP1 conferred Mn2+ tolerance through internal sequestration. The ShMTP1 protein fused to green fluorescent protein was localized to the tonoplast of Arabidopsis cells but appeared to localize to the endoplasmic reticulum of yeast. We suggest that the ShMTP1 proteins are members of the CDF family involved in conferring Mn2+ tolerance and that at least one of these proteins (ShMTP1) confers tolerance by sequestering Mn2+ into internal organelles.




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