Photobody Formation Spatially Segregates Two Opposing Phytochrome B Signaling Actions of PIF5 Degradation and Stabilization

Overview

Journal Nat Commun

Specialty Biology

Date 2024 Apr 25

PMID 38664420

Authors

Ruth Jean Ae Kim

De Fan

Jiangman He

Keunhwa Kim

Juan Du

Meng Chen

Affiliations

Soon will be listed here.

Abstract

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.

Citing Articles

Distinguishing individual photobodies using Oligopaints reveals thermo-sensitive and -insensitive phytochrome B condensation at distinct subnuclear locations.

Du J, Kim K, Chen M Nat Commun. 2024; 15(1):3620.

PMID: 38684657 PMC: 11058242. DOI: 10.1038/s41467-024-47789-1.

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