Journal
MOLECULAR PLANT
Volume 5, Issue 3, Pages 573-582Publisher
CELL PRESS
DOI: 10.1093/mp/sss013
Keywords
blue light; LOV domain; ZTL; FKF1; LKP2; photoperiodic flowering; circadian clock; Arabidopsis
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Funding
- JSPS
- (SSAC), Rural Development Administration, Republic of Korea [PJ008109]
- NIH [GM079712]
- Grants-in-Aid for Scientific Research [24870015] Funding Source: KAKEN
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Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity (=intensity) and quality (=wavelength) of light and use this information to adjust their physiological responses, growth, and developmental patterns. In addition to the classical photoreceptors, such as phytochromes, cryptochromes, and phototropins, ZEITLUPE (ZTL), FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 (FKF1), and by KELCH PROTEIN 2 (LKP2) proteins have been recently identified as blue-light photoreceptors that are important for regulation of the circadian clock and photoperiodic flowering. The ZTL/FKF1/LKP2 protein family possesses a unique combination of domains: a blue-light-absorbing LOV (Light, Oxygen, or Voltage) domain along with domains involved in protein degradation. Here, we summarize recent advances in our understanding of the function of the Arabidopsis ZTL/FKF1/LKP2 proteins. We summarize the distinct photochemical properties of their LOV domains and discuss the molecular mechanisms by which the ZTL/FKF1/LKP2 proteins regulate the circadian clock and photoperiodic flowering by controlling blue-light-dependent protein degradation.
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