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Metallothioneins are cysteine-rich metal-binding proteins. In the present study,  SaMT2 , a type 2 metallothionein gene, was isolated from Cd/Zn co-hyperaccumulator  Sedum alfredii  Hance.  SaMT2  encodes a putative peptide of 79 amino acid residues including two cysteine-rich domains. The transcript level of SaMT2 was higher in shoots than in roots of  S. alfredii , and was significantly induced by Cd and Zn treatments. Yeast expression assay showed  SaMT2  significantly enhanced Cd tolerance and accumulation in yeast. Ectopic expression of  SaMT2  in tobacco enhanced Cd and Zn tolerance and accumulation in both shoots and roots of the transgenic plants. The transgenic plants had higher antioxidant enzyme activities and accumulated less H 2 O 2  than wild-type plants under Cd and Zn treatment. Thus,  SaMT2  could significantly enhance Cd and Zn tolerance and accumulation in transgenic tobacco plants by chelating metals and improving antioxidant system.

Metallothionein 2 (SaMT2) from Sedum alfredii Hance Confers Increased Cd Tolerance and Accumulation in Yeast and Tobacco