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Zinc finger proteins were involved in response to different environmental stresses in plant species. A typical Cys2/His2-type (C2H2-type) zinc finger gene  GmZF1  from soybean was isolated and was composed of 172 amino acids containing two conserved C2H2-type zinc finger domains. Phylogenetic analysis showed that GmZF1 was clustered on the same branch with six C2H2-type ZFPs from dicotyledonous plants excepting for GsZFP1, and distinguished those from monocotyledon species. The GmZF1 protein was localized at the nucleus, and has specific binding activity with EP1S core sequence, and nucleotide mutation in the core sequence of  EPSPS  promoter changed the binding ability between GmZF1 protein and core DNA element, implying that two amino acid residues, G and C boxed in core sequence  TGACAGTGTCA  possibly play positive regulation role in recognizing DNA-binding sites in GmZF1 proteins. High accumulation of  GmZF1  mRNA induced by exogenous ABA suggested that  GmZF1  was involved in an ABA-dependent signal transduction pathway. Over-expression of  GmZF1  significantly improved the contents of proline and soluble sugar and decreased the MDA contents in the transgenic lines exposed to cold stress, indicating that transgenic  Arabidopsis  carrying  GmZF1  gene have adaptive mechanisms to cold stress. Over-expression of  GmZF1  also increased the expression of cold-regulated  cor6.6  gene by probably recognizing protein-DNA binding sites, suggesting that  GmZF1  from soybean could enhance the tolerance of  Arabidopsis  to cold stress by regulating expression of cold-regulation gene in the transgenic  Arabidopsis .

A Soybean C2H2-Type Zinc Finger Gene GmZF1 Enhanced Cold Tolerance in Transgenic Arabidopsis