Characterization of AtbZIP2, AtbZIP11 and AtbZIP53 from the group S basic region-leucine zipper family in Arabidopsis thaliana
We have previously described the <i>lip19</i> subfamily of basic region-leucine zipper protein (bZIP)-encoding genes from plants. Phylogenetic analysis of bZIP-encoded genes of <i>Arabidopsis thaliana</i> revealed that <i>AtbZIP53</i> belongs to the <i>lip19</i> subfamily and that four other members, <i>AtbZIP1</i>, <i>AtbZIP2</i>, <i>AtbZIP11</i> and <i>AtbZIP44</i> have close relationships to this subfamily. Here, we further characterized <i>AtbZIP53</i> and two additional bZIP genes, <i>AtbZIP2</i> and <i>AtbZIP11</i>. All three gene products are localized to the nucleus and show strong DNA binding activity to hexamer and C/G box hybrid sequences. Transactivation activities of the proteins were examined in plant cells. The expression of the genes upon exposure to various abiotic stresses and to hormone treatments was examined in <i>Arabidopsis</i>. We found that <i>AtbZIP11</i> and <i>AtbZIP53</i> were responsive to cytokinin and high salt stress, respectively. Based on these data, the physiological roles are discussed.
- Plant biotechnology
Plant biotechnology 23(3), 249-258, 2006-06-01
Japanese Society for Plant Cell and Molecular Biology