Abstract
The mammalian zinc finger protein ZPR1 is known to be essential in cell cycle progression, but its homolog in plants remains to be identified. Here, we isolated SpZPR1 from the wild tomato species Solanum pennellii LA0716 and found that its protein sequence shares homology with ZPR1 genes from other organisms. SpZPR1 mRNA was found to accumulate in tomato apical meristem in response to ABA (abscisic acid) treatment and heat stress. A transactivation activity assay in yeast revealed that SpZPR1 functions as a transcriptional activator, while the results of our gel electrophoresis mobility shift assay showed that SpZPR1 was able to bind the ABRE (ABA-responsive element) sequence in vitro. Our study is the first to provide evidence that SpZPR1 is involved in the ABA signaling network and plays a potential role in plant cell development and abiotic stress response.
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