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http://dx.doi.org/10.5352/JLS.2003.13.5.596

Isolation and Characterization of a Novel Transcription Factor ATFC Activated by ER Stress from Bombyx mori Bm5 Cell Lines  

구태원 (농촌진흥청 농업과학기술원)
윤은영 (농촌진흥청 농업과학기술원)
김성완 (농촌진흥청 농업과학기술원)
최광호 (농촌진흥청 농업과학기술원)
황재삼 (농촌진흥청 농업과학기술원)
박수정 (충남대학교 의과대학)
권오유 (충남대학교 의과대학)
강석우 (농촌진흥청 농업과학기술원)
Publication Information
Journal of Life Science / v.13, no.5, 2003 , pp. 596-603 More about this Journal
Abstract
Cells respond to an accumulation of unfolded proteins in the endoplasmic reticulum (ER) by increasing transcription of genes encoding molecular chaperones and folding enzymes. The information is transmitted from the ER lumen to the nucleus by intracellular signaling pathway, called the unfolded protein response (UPR). To obtain genes related to UPR from B. mori, the cDNA library was constructed with mRNA isolated from Bm5 cell lines in which N-glycosylation was inhibited by tunicamycin treatment. From the cDNA library, we selected 40 clones that differentially expressed when cells were treated with tunicamycin. Among these clones, we have isolated ATFC gene showing similarity with Hac1p, encoding a bZIP transcription factor of 5. cerevisiae. Basic-leucine zipper (bZIP) domain in amino acid sequences of ATFC shared homology with yeast Hac1p. Also, ATFC is up-regulated by accumulation of unfolded proteins in the ER through the treatment of ER stress drugs. Therefore we suggest that ATFC represents a major component of the putative transcription factor responsible for the UPR leading to the induction of ER-localized stress proteins.
Keywords
ATFC; Bm5; Bombyx mori; bZIP; ER; Hac1p; molecular chaperone; UPR;
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