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The expression of hundreds of genes is induced by low temperatures via a cold signaling pathway. ICE1, a MYC-type transcription factor, plays an important role in the induction of  CBF3 / DREB1A  to control cold-responsive genes and cold tolerance. To elucidate other molecular factors, a yeast 2-hybrid screening was performed. Two MYC-type transcription factors, MYC67 and MYC70, were identified as ICE1-interacting proteins. The  myc  mutants were more tolerant to freezing temperatures than wild type.  CBF3 / DREB1A  and other cold-responsive genes were up-regulated in the  myc  mutants. Overexpression of the  MYC  genes increased the cold sensitivity and down-regulated the expression of cold-responsive genes. The MYC proteins interacted with the  cis- elements in the  CBF3 / DREB1A  promoter, probably to interfere interaction between ICE1 and the  cis- elements. Taken together, these results demonstrate that MYC67 and MYC70, ICE1 interactors, negatively regulate cold-responsive genes and cold tolerance.

MYC-type transcription factors, MYC67 and MYC70, interact with ICE1 and negatively regulate cold tolerance in Arabidopsis