CRY1 INHIBITS COP1-MEDIATED DEGRADATION OF BIT1, A MYB TRANSCRIPTION FACTOR, TO ACTIVATE BLUE LIGHT-DEPENDENT GENE EXPRESSION IN ARABIDOPSIS
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SCOPUS
- Title
- CRY1 INHIBITS COP1-MEDIATED DEGRADATION OF BIT1, A MYB TRANSCRIPTION FACTOR, TO ACTIVATE BLUE LIGHT-DEPENDENT GENE EXPRESSION IN ARABIDOPSIS
- Authors
- Hong, SH; Kim, HJ; Ryu, JS; Choi, H; Jeong, S; Shin, J; Choi, G; Nam, HG
- Date Issued
- 2008-08
- Publisher
- BLACKWELL PUBLISHING
- Abstract
- Cryptochromes (CRY) are one of the two major classes of photoreceptors that perceive light stimuli in the UV-A to blue light region and they are involved in multiple aspects of plant growth and development. However, knowledge regarding their signaling transduction components and mechanisms remains limited. Here, we report that a MYB transcription factor Blue Insensitive Trait 1 (BIT1), plays an important role in controlling blue light responses. Hypocotyl growth responses indicate that BIT1 functions as a positive element in blue light signaling, since BIT1 antisense and knock-out lines show a reduced light response in blue light. BIT1 controls blue light-dependent expression of various genes such as PsbS, a member of the light-harvesting complex gene family. A transactivation assay showed that BIT1 regulates promoter activity of PsbS in a blue light-dependent manner and that it requires CRY1 for activation of the PsbS promoter. BIT1 undergoes degradation in darkness and CRY1 functions to stabilize BIT1 in a blue light-dependent manner. In contrast, COP1 binds to BIT1 and mediates its degradation. We propose that the PsbS promoter is activated in blue light via the blue light-dependent stabilization of BIT1 by CRY1, while in darkness BIT1 is degraded by COP1-mediated proteolysis.
- Keywords
- Arabidopsis; BIT1; blue light; COP1; CRY1; MEDIATED PHOTOMORPHOGENIC GROWTH; SIGNAL-TRANSDUCTION; HIGHER-PLANTS; PHYTOCHROME; COP1; CRYPTOCHROME; PROTEIN; THALIANA; HYPOCOTYL; PATHWAYS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29047
- DOI
- 10.1111/j.1365-313X.2008.03508.x
- ISSN
- 0960-7412
- Article Type
- Article
- Citation
- PLANT JOURNAL, vol. 55, no. 3, page. 361 - 371, 2008-08
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