A membrane-tethered transcription factor defines a branch of the heat stress response in Arabidopsis thaliana

• DOI: 10.1073/pnas.0808463105
• Publication Date: 2008-10-11T00:54:25Z
• Authors: Hongbo Gao; Federica Brandizzi; Christoph Benning; Robert M. Larkin
• Keywords: 0303 health sciences; 03 medical and health sciences; Basic-Leucine Zipper Transcription Factors; Hot Temperature; Arabidopsis Proteins; Mutation; Arabidopsis; Plants, Genetically Modified; Heat-Shock Response; Molecular Chaperones

In plants, heat stress responses are controlled by transcription factors that conserved among all eukaryotes and can be constitutively expressed or induced heat. Heat-inducible distinct from the "classical" have also been reported to contribute tolerance. Here, we show bZIP28, a gene encoding putative membrane-tethered factor, is up-regulated in response bZIP28 null mutant has striking heat-sensitive phenotype. The heat-inducible expression of genes encode BiP2, an endoplasmic reticulum (ER) chaperone, HSP26.5-P, small shock protein, attenuated mutant. An estradiol-inducible transgene induces variety ER stress-inducible genes. Moreover, appears induce proteolytic release predicted factor domain membrane, thereby causing its redistribution nucleus. These findings indicate essential component factor-based signaling pathway contributes