What is going on inside of phytochrome B photobodies? (2024)

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Björn Christopher Willige

Department of Soil and Crop Sciences, College of Agricultural Sciences, Colorado State University

,

Fort Collins, CO 80521

,

USA

Authors for correspondence: bjorn.willige@colostate.edu (B.C.W.), chanyul.yoo@utah.edu (C.Y.Y.)

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,

Chan Yul Yoo

School of Biological Sciences, University of Utah

,

UT 84112

,

USA

Authors for correspondence: bjorn.willige@colostate.edu (B.C.W.), chanyul.yoo@utah.edu (C.Y.Y.)

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Jessica Paola Saldierna Guzmán

Department of Soil and Crop Sciences, College of Agricultural Sciences, Colorado State University

,

Fort Collins, CO 80521

,

USA

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The Plant Cell, Volume 36, Issue 6, June 2024, Pages 2065–2085, https://doi.org/10.1093/plcell/koae084

Published:

21 March 2024

Article history

Received:

30 August 2023

Accepted:

08 January 2024

Published:

21 March 2024

Corrected and typeset:

18 April 2024

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    Björn Christopher Willige, Chan Yul Yoo, Jessica Paola Saldierna Guzmán, What is going on inside of phytochrome B photobodies?, The Plant Cell, Volume 36, Issue 6, June 2024, Pages 2065–2085, https://doi.org/10.1093/plcell/koae084

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Abstract

Plants exhibit an enormous phenotypic plasticity to adjust to changing environmental conditions. For this purpose, they have evolved mechanisms to detect and measure biotic and abiotic factors in their surroundings. Phytochrome B exhibits a dual function, since it serves as a photoreceptor for red and far-red light as well as a thermosensor. In 1999, it was first reported that phytochromes not only translocate into the nucleus but also form subnuclear foci upon irradiation by red light. It took more than 10 years until these phytochrome speckles received their name; these foci were coined photobodies to describe unique phytochrome-containing subnuclear domains that are regulated by light. Since their initial discovery, there has been much speculation about the significance and function of photobodies. Their presumed roles range from pure experimental artifacts to waste deposits or signaling hubs. In this review, we summarize the newest findings about the meaning of phyB photobodies for light and temperature signaling. Recent studies have established that phyB photobodies are formed by liquid-liquid phase separation via multivalent interactions and that they provide diverse functions as biochemical hotspots to regulate gene expression on multiple levels.

© The Author(s) 2024. Published by Oxford University Press on behalf of American Society of Plant Biologists. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.

This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/pages/standard-publication-reuse-rights)

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