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Photoexcited CRY2 Interacts with CIB1 to Regulate Transcription and Floral Initiation in Arabidopsis
The identification and characterization of the Arabidopsis CIB1 (cryptochrome-interacting basic-helix-loop-Helix) protein is reported, and it is proposed that the blue light–dependent interaction of cryptochrome(s) with C IB1 and CIB 1-related proteins represents an early photoreceptor signaling mechanism in plants.
Blue Light-Dependent Interaction of CRY2 with SPA1 Regulates COP1 activity and Floral Initiation in Arabidopsis
Arabidopsis cryptochrome 1 interacts with SPA1 to suppress COP1 activity in response to blue light.
- B. Liu, Zecheng Zuo, Hongtao Liu, Xuanming Liu, Chentao Lin
- Biology, Environmental ScienceGenes & Development
- 15 May 2011
It is reported here that Arabidopsis blue-light receptor cryptochrome 1 (CRY1) undergoes blue- light-dependent interaction with the COP1-interacting protein SPA1 (SUPPRESSOR of PHYTOCHROME A), consistent with a hypothesis that photoexcited CRY1 interacts with SPA2 to modulate COP1 activity and plant development.
Blue Light Receptors and Signal Transduction Article, publication date, and citation information can be found at www.plantcell.org/cgi/doi/10.1105/tpc.000646.
- Chentao Lin
- PhysicsThe Plant Cell Online
- 1 May 2002
A plant blue light response was documented as early as 1881 by Darwin when he discovered what is now known as the blue light–induced phototropic response ([Darwin, 1881]). However, blue light…
Cryptochrome structure and signal transduction.
Recent studies suggest that cryptochromes undergo a blue light-dependent phosphorylation that affects the conformation, intermolecular interactions, physiological activities, and protein abundance of the photoreceptors.
Regulation of photoperiodic flowering by Arabidopsis photoreceptors
- T. Mockler, Hongyun Yang, Chentao Lin
- Environmental ScienceProceedings of the National Academy of Sciences…
- 10 February 2003
It is shown that phyA mediates far-red light promotion of flowering with modes of action similar to that of cry2, and a model is proposed to explain how individual phytochromes and cryptochromes work together to confer photoperiodic responsiveness in Arabidopsis.
A Study of Gibberellin Homeostasis and Cryptochrome-Mediated Blue Light Inhibition of Hypocotyl Elongation1[W][OA]
Surprisingly, no significant change in the GA4 content was detected in the whole shoot samples of the wild-type or cry1cry2 seedlings grown in the dark or continuous blue light, suggesting that cryptochromes may also regulate GA responsiveness and/or trigger cell- or tissue-specific changes of the level of bioactive GAs.
The Cryptochrome Blue Light Receptors
It is hypothesized that photons excite electrons of the flavin molecule, resulting in redox reaction or circular electron shuttle and conformational changes of the photoreceptors, which alters gene expression at both transcriptional and posttranslational levels and consequently the metabolic and developmental programs of plants.
Regulation of Arabidopsis cryptochrome 2 by blue-light-dependent phosphorylation
The results suggest that, in the absence of light, cry2 remains unphosphorylated, inactive and stable; absorption of blue light induces the phosphorylation of cry2, triggering photomorphogenic responses and eventually degradation of the photoreceptor.
Blue Light–Dependent in Vivo and in Vitro Phosphorylation of Arabidopsis Cryptochrome 1 Article, publication date, and citation information can be found at…
- D. Shalitin, Xuhong Yu, Maskit Maymon, T. Mockler, Chentao Lin
- Biology, Environmental ScienceThe Plant Cell Online
- 1 October 2003
It is demonstrated that blue light–dependent cry1 phosphorylation is closely associated with the function or regulation of the photoreceptor and that the overall structure of cry1 is critical to itsosphorylation.