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Photobody formation spatially segregates two opposing phytochrome B signaling actions of PIF5 degradation and stabilization
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Photobody formation spatially segregates two opposing phytochrome B signaling actions of PIF5 degradation and stabilization
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Journal Article
Photobody formation spatially segregates two opposing phytochrome B signaling actions of PIF5 degradation and stabilization
2024
Overview
Photoactivation of the plant photoreceptor and thermosensor phytochrome B (PHYB) triggers its condensation into subnuclear membraneless organelles named photobodies (PBs). However, the function of PBs in PHYB signaling remains frustratingly elusive. Here, we found that PHYB recruits PHYTOCHROME-INTERACTING FACTOR 5 (PIF5) to PBs. Surprisingly, PHYB exerts opposing roles in degrading and stabilizing PIF5. Perturbing PB size by overproducing PHYB provoked a biphasic PIF5 response: while a moderate increase in PHYB enhanced PIF5 degradation, further elevating the PHYB level stabilized PIF5 by retaining more of it in enlarged PBs. Conversely, reducing PB size by dim light, which enhanced PB dynamics and nucleoplasmic PHYB and PIF5, switched the balance towards PIF5 degradation. Together, these results reveal that PB formation spatially segregates two antagonistic PHYB signaling actions – PIF5 stabilization in PBs and PIF5 degradation in the surrounding nucleoplasm – which could enable an environmentally sensitive, counterbalancing mechanism to titrate nucleoplasmic PIF5 and environmental responses.
Photobodies are plant nuclear bodies containing the photoreceptor phytochrome B. Here, the authors reveal that photobody formation segregates opposing phytochrome B-mediated light-signaling actions into two phase-separated subnuclear compartments
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
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/ 38/77
/ 38/88
/ 38/90
/ 45/29
/ 82/51
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - metabolism
/ Basic Helix-Loop-Helix Transcription Factors - genetics
/ Basic Helix-Loop-Helix Transcription Factors - metabolism
/ Gene Expression Regulation, Plant
/ Humanities and Social Sciences
/ Light
/ Plants, Genetically Modified
/ Proteolysis - radiation effects
/ Science
