Phytochrome signaling mechanisms and the control of plant development

Trends in Cell Biology, Год журнала: 2011, Номер 21(11), С. 664 - 671

Опубликована: Авг. 18, 2011

Язык: Английский

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Light signaling and plant responses to blue and UV radiations—Perspectives for applications in horticulture

Environmental and Experimental Botany, Год журнала: 2015, Номер 121, С. 22 - 38

Опубликована: Июнь 18, 2015

Язык: Английский

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Arabidopsis cryptochrome 1 interacts with SPA1 to suppress COP1 activity in response to blue light

Genes & Development, Год журнала: 2011, Номер 25(10), С. 1029 - 1034

Опубликована: Апрель 21, 2011

Plant photoreceptors mediate light suppression of the E3 ubiquitin ligase COP1 (CONSTITUTIVE PHOTOMORPHOGENIC 1) to affect gene expression and photomorphogenesis. However, how regulation activity remains unknown. We report here that Arabidopsis blue-light receptor cryptochrome 1 (CRY1) undergoes blue-light-dependent interaction with COP1-interacting protein SPA1 (SUPPRESSOR OF PHYTOCHROME A). further show CRY1–SPA1 suppresses SPA1–COP1 COP1-dependent degradation transcription factor HY5. These results are consistent a hypothesis photoexcited CRY1 interacts modulate plant development.

Язык: Английский

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Light and the E3 ubiquitin ligase COP1/SPA control the protein stability of the MYB transcription factors PAP1 and PAP2 involved in anthocyanin accumulation in Arabidopsis

The Plant Journal, Год журнала: 2013, Номер 74(4), С. 638 - 651

Опубликована: Фев. 20, 2013

Anthocyanins are natural pigments that accumulate only in light-grown and not dark-grown Arabidopsis plants. Repression of anthocyanin accumulation darkness requires the CONSTITUTIVELY PHOTOMORPHOGENIC1/SUPPRESSOR OF PHYA-105 (COP1/SPA) ubiquitin ligase, as cop1 spa mutants produce anthocyanins also dark. Here, we show COP1 SPA proteins interact with myeloblastosis (MYB) transcription factors PRODUCTION ANTHOCYANIN PIGMENT1 (PAP)1 PAP2, two members a small protein family is required for expression structural genes biosynthesis pathway. The increased levels PAP1 gene family, indicating functions upstream family. PAP2 degraded dark this degradation dependent on proteasome COP1. Hence, light requirement results, at least part, from light-mediated stabilization PAP2. Consistent conclusion, moderate overexpression leads to an increase darkness. Here reducing transcript seedlings. Taken together, these results indicate COP1/SPA complex affects both transcriptionally post-translationally. Thus, our findings have identified mechanisms via which controls may be useful applications biotechnology directed towards increasing content

Язык: Английский

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The ubiquitin–proteasome system: central modifier of plant signalling

New Phytologist, Год журнала: 2012, Номер 196(1), С. 13 - 28

Опубликована: Авг. 16, 2012

Ubiquitin is well established as a major modifier of signalling in eukaryotes. However, the extent to which plants rely on ubiquitin for regulating their lifecycle only recently becoming apparent. This underlined by over-representation genes encoding ubiquitin-metabolizing enzymes Arabidopsis when compared with other model The main characteristic ubiquitination conjugation onto lysine residues acceptor proteins. In most cases targeted protein rapidly degraded 26S proteasome, proteolysis machinery eukaryotic cells. ubiquitin-proteasome system responsible removing abnormal peptides and short-lived cellular regulators, which, turn, control many processes. allows cells respond intracellular signals changing environmental conditions. review maps out roles components emphasis areas where future research urgently needed. We provide flavour diverse aspects plant implicated. aim highlight common themes using key examples that reiterate importance plants. challenge biology define targets ubiquitination, interactors molecular function within regulatory context.

Язык: Английский

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Magnetically sensitive light-induced reactions in cryptochrome are consistent with its proposed role as a magnetoreceptor

Proceedings of the National Academy of Sciences, Год журнала: 2012, Номер 109(13), С. 4774 - 4779

Опубликована: Март 14, 2012

Among the biological phenomena that fall within emerging field of “quantum biology” is suggestion magnetically sensitive chemical reactions are responsible for magnetic compass migratory birds. It has been proposed transient radical pairs formed by photo-induced electron transfer in cryptochrome proteins and their coherent spin dynamics influenced geomagnetic leading to changes quantum yield signaling state protein. Despite a variety supporting evidence, it still not clear whether cryptochromes have properties required respond interactions orders magnitude weaker than thermal energy, k B T . Here we demonstrate kinetics yields flavin—tryptophan indeed sensitive. The mechanistic origin effect clarified, its dependence on strength measured, rates relevant spin-dependent, spin-independent, spin-decoherence processes determined. We argue fit purpose as magnetoreceptor.

Язык: Английский

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Light-Activated Phytochrome A and B Interact with Members of the SPA Family to Promote Photomorphogenesis in Arabidopsis by Reorganizing the COP1/SPA Complex

The Plant Cell, Год журнала: 2015, Номер 27(1), С. 189 - 201

Опубликована: Янв. 1, 2015

Phytochromes function as red/far-red photoreceptors in plants and are essential for light-regulated growth development. Photomorphogenesis, the developmental program light, is default seed plants. In dark-grown seedlings, photomorphogenic suppressed by action of CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1)/SUPPRESSOR OF phyA-105 (SPA) complex, which targets positive regulators degradation proteasome. inhibit COP1/SPA leading to accumulation transcription factors promoting photomorphogenesis; yet, mechanism they inactivate still unknown. Here, we show that light-activated phytochrome A (phyA) B (phyB) interact with SPA1 other SPA proteins. Fluorescence resonance energy transfer-fluorescence lifetime imaging microscopy analyses SPAs phytochromes colocalize nuclear bodies. Furthermore, phyA phyB disrupt interaction between COP1 SPAs, resulting reorganization complex planta. The light-induced stabilization HFR1, a factor targeted COP1/SPA, correlates temporally nucleus localization Overall, these data provide molecular inactivation phyA- phyB-mediated light perception.

Язык: Английский

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Circadian Clock and Photoperiodic Flowering in Arabidopsis: CONSTANS Is a Hub for Signal Integration

PLANT PHYSIOLOGY, Год журнала: 2016, Номер 173(1), С. 5 - 15

Опубликована: Сен. 29, 2016

The circadian clock and light signaling regulate CONSTANS function through intricate mechanisms that reside in phloem companion cells of leaves for controlling photoperiodic flowering Arabidopsis.

Язык: Английский

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The UV-B Photoreceptor UVR8: From Structure to Physiology

The Plant Cell, Год журнала: 2014, Номер 26(1), С. 21 - 37

Опубликована: Янв. 1, 2014

Low doses of UV-B light (280 to 315 nm) elicit photomorphogenic responses in plants that modify biochemical composition, photosynthetic competence, morphogenesis, and defense. UV RESISTANCE LOCUS8 (UVR8) mediates by regulating transcription a set target genes. UVR8 differs from other known photoreceptors it uses specific Trp amino acids instead prosthetic chromophore for absorption during photoreception. Absorption dissociates the dimer into monomers, initiating signal transduction through interaction with CONSTITUTIVELY PHOTOMORPHOGENIC1. However, much remains be learned about physiological role its signaling pathways, molecular mechanism photoreception, how protein initiates signaling, is regulated, regulates

Язык: Английский

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GIGANTEA Enables Drought Escape Response via Abscisic Acid-Dependent Activation of the Florigens and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1

PLANT PHYSIOLOGY, Год журнала: 2013, Номер 162(3), С. 1706 - 1719

Опубликована: Май 29, 2013

Modulation of the transition to flowering plays an important role in adaptation drought. The drought-escape (DE) response allows plants adaptively shorten their life cycle make seeds before severe stress leads death. However, molecular basis DE is unknown. A screen different Arabidopsis (Arabidopsis thaliana) time mutants under DE-triggering conditions revealed central flower-promoting gene GIGANTEA (GI) and florigen genes FLOWERING LOCUS T (FT) TWIN SISTER OF FT (TSF) response. Further screens showed that phytohormone abscisic acid required for response, positively regulating long-day conditions. Drought promotes transcriptional up-regulation florigens acid- photoperiod-dependent manner, so early only occurs long days. Along with florigens, floral integrator SUPPRESSOR OVEREXPRESSION CONSTANS1 also up-regulated a similar fashion contributes activation TSF. was recovered short days absence repressor SHORT VEGETATIVE PHASE or GI-overexpressing plants. Our data reveal key GI connecting photoperiodic cues environmental independently from FT/TSF activator CONSTANS. This mechanism explains how may act upon photoperiodically controlled thus enabling plastic responses.

Язык: Английский

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