Blue Light Receptors and Signal Transduction

Lin, Chentao

doi:10.1105/tpc.000646

Cited by 311 publications

(253 citation statements)

References 141 publications

(147 reference statements)

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“…Because phototropins are protein kinases associated with the plasma membrane (5,36), one might assume that phototropins can phosphorylate the H ϩ -ATPase directly (37)(38)(39). The present results argue against this hypothesis and instead indicate the presence of another protein kinase that directly phosphorylates the H ϩ -ATPase.…”

Section: Discussioncontrasting

confidence: 50%

Protein phosphatase 1 positively regulates stomatal opening in response to blue light in Vicia faba

Takemiya

Kinoshita

Asanuma

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

116

109

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Section: Discussioncontrasting

confidence: 50%

Protein phosphatase 1 positively regulates stomatal opening in response to blue light in Vicia faba

Takemiya

Kinoshita

Asanuma

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

116

109

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“…Although some mechanistic details of cry1 action have been determined, an integrated view of how its absorption of blue light results in the various previous responses is lacking. The structural similarity between cry1 and DNA photolyases, light-activated enzymes that repair DNA dimers, indicated a nuclear localized function (11). Indeed, cry1 is present in the nucleus (12), but it is not known to bind or repair DNA (1).…”

mentioning

confidence: 99%

Separate functions for nuclear and cytoplasmic cryptochrome 1 during photomorphogenesis ofArabidopsisseedlings

Spalding

2007

Proc. Natl. Acad. Sci. U.S.A.

103

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Cryptochrome blue-light receptors mediate many aspects of plant photomorphogenesis, such as suppression of hypocotyl elongation and promotion of cotyledon expansion and root growth. The cryptochrome 1 (cry1) protein of Arabidopsis is present in the nucleus and cytoplasm of cells, but how the functions of one pool differ from the other is not known. Nuclear localization and nuclear export signals were genetically engineered into GFP-tagged cry1 molecules to manipulate cry1 subcellular localization in a cry1-null mutant background. The effectiveness of the engineering was confirmed by confocal microscopy. The ability of nuclear or cytoplasmic cry1 to rescue a variety of cry1 phenotypes was determined. Hypocotyl growth suppression by blue light was assessed by standard end-point analyses and over time with high resolution by a custom computer-vision technique. Both assays indicated that nuclear, rather than cytoplasmic, cry1 was the effective molecule in these growth inhibitions, as was the case for the mechanistically linked membrane depolarization, which occurs within several seconds of cry1 activation. Petiole elongation also was inhibited by nuclear, but not cytoplasmic, cry1. Conversely, primary root growth and cotyledon expansion in blue light were promoted by cytoplasmic cry1 and inhibited by nuclear cry1. Anthocyanin production in response to blue light was strongly stimulated by nuclear cry1 and, to a lesser extent, by cytoplasmic cry1. An important step toward elucidation of cry1 signaling pathways is the recognition that different subcellular pools of the photoreceptor have different functions.blue light ͉ hypocotyl ͉ nuclear localization ͉ membrane depolarization ͉ anion channel

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“…Light signals perceived by photoreceptors, including phytochromes and cryptochromes (Lin, 2002;Nagy and Schafer, 2002;Quail, 2002), are the most important environmental inputs to the plant circadian clock (Ni, 2005). Photoperception allows entrainment of the clock to dawn and dusk cues, allowing correct phasing of the various clock-controlled genes and pathways (Salome and McClung, 2005b).…”

mentioning

confidence: 99%

ELF4Is Required for Oscillatory Properties of the Circadian Clock

et al. 2007

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Circadian clocks are required to coordinate metabolism and physiology with daily changes in the environment. Such clocks have several distinctive features, including a free-running rhythm of approximately 24 h and the ability to entrain to both light or temperature cycles (zeitgebers). We have previously characterized the EARLY FLOWERING4 (ELF4) locus of Arabidopsis (Arabidopsis thaliana) as being important for robust rhythms. Here, it is shown that ELF4 is necessary for at least two core clock functions: entrainment to an environmental cycle and rhythm sustainability under constant conditions. We show that elf4 demonstrates clock input defects in light responsiveness and in circadian gating. Rhythmicity in elf4 could be driven by an environmental cycle, but an increased sensitivity to light means the circadian system of elf4 plants does not entrain normally. Expression of putative core clock genes and outputs were characterized in various ELF4 backgrounds to establish the molecular network of action. ELF4 was found to be intimately associated with the CIRCADIAN CLOCK-ASSOCIATED1 (CCA1)/LONG ELONGATED HYPOCOTYL (LHY)-TIMING OF CAB EXPRESSION1 (TOC1) feedback loop because, under free run, ELF4 is required to regulate the expression of CCA1 and TOC1 and, further, elf4 is locked in the evening phase of this feedback loop. ELF4, therefore, can be considered a component of the central CCA1/LHY-TOC1 feedback loop in the plant circadian clock.

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Blue Light Receptors and Signal Transduction

Cited by 311 publications

References 141 publications

Protein phosphatase 1 positively regulates stomatal opening in response to blue light in Vicia faba

Protein phosphatase 1 positively regulates stomatal opening in response to blue light in Vicia faba

Separate functions for nuclear and cytoplasmic cryptochrome 1 during photomorphogenesis ofArabidopsisseedlings

ELF4Is Required for Oscillatory Properties of the Circadian Clock

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