Proteomics

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An epitranscriptomic mechanism regulating chlorophyll biosynthesis in Arabidopsis


ABSTRACT: Light modulates expression of nuclear-encoded chloroplast proteins to promote chlorophyll biosynthesis and photosynthesis in plants. Photoregulatory mechanisms regulating transcription and protein stability of nuclear-encoded chloroplast proteins have been extensively studied, but how photoresponsive mRNA metabolism affecting chloroplast proteins remains not well understood. We performed a systematic analysis of the photoresponsive transcriptomes, m6A epitranscriptomes, translatomes, and proteomes in Arabidopsis, leading to a hypothesis that the blue light receptor cryptochromes activate the RNA methyltransferase, FIONA 1 (FIO1), to increase RNA methylation, translation of the nuclear-encoded chlorophyll synthesis enzymes (CSEs), and chlorophyll synthesis. We further demonstrate that the photoresponsive CRY2-interacting protein, SPA1, acts as a chaperone to mediate co-condensation of the CRY2/FIO1 complex, activating the FIO1 methyltransferase activity. This finding demonstrates a previously unknown photoregulatory mechanism controlling chlorophyll biosynthesis in plants.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Arabidopsis Thaliana (mouse-ear Cress)

TISSUE(S): Whole Body

SUBMITTER: xueyang zhang  

LAB HEAD: Xeuyang Zhang

PROVIDER: PXD040660 | Pride | 2024-01-26

REPOSITORIES: Pride

Dataset's files

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CRY-1-BL.raw Raw
CRY-1-DK.raw Raw
CRY-2-BL.raw Raw
CRY-2-DK.raw Raw
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Publications

Light-induced LLPS of the CRY2/SPA1/FIO1 complex regulating mRNA methylation and chlorophyll homeostasis in Arabidopsis.

Jiang Bochen B   Zhong Zhenhui Z   Gu Lianfeng L   Zhang Xueyang X   Wei Jiangbo J   Ye Chang C   Lin Guifang G   Qu Gaoping G   Xiang Xian X   Wen Chenjin C   Hummel Maureen M   Bailey-Serres Julia J   Wang Qin Q   He Chuan C   Wang Xu X   Lin Chentao C  

Nature plants 20231208 12


Light regulates chlorophyll homeostasis and photosynthesis via various molecular mechanisms in plants. The light regulation of transcription and protein stability of nuclear-encoded chloroplast proteins have been extensively studied, but how light regulation of mRNA metabolism affects abundance of nuclear-encoded chloroplast proteins and chlorophyll homeostasis remains poorly understood. Here we show that the blue light receptor cryptochrome 2 (CRY2) and the METTL16-type m<sup>6</sup>A writer FI  ...[more]

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