HY5 Interacts with the Histone Deacetylase HDA15 to Repress Hypocotyl Cell Elongation in Photomorphogenesis

Overview

Journal Plant Physiol

Specialty Physiology

Date 2019 May 8

PMID 31061103

Citations 36

Authors

Linmao Zhao

Tao Peng

Chia-Yang Chen

Rujun Ji

Dachuan Gu

Tingting Li

Dongdong Zhang

Yi-Tsung Tu

Keqiang Wu

Xuncheng Liu

Affiliations

Soon will be listed here.

Abstract

Photomorphogenesis is a critical plant developmental process that involves light-mediated transcriptome and histone modification changes. The transcription factor ELONGATED HYPOCOTYL5 (HY5) acts downstream of multiple families of photoreceptors to promote photomorphogenesis by regulating the expression of light-responsive genes. However, the molecular mechanism for HY5-mediated transcriptional regulation remains largely unclear. Here, we demonstrated that HY5 directly interacts with a Reduced Potassium Dependence3/Histone Deacetylase1 (HDA1)-type histone deacetylase, HDA15, both in vitro and in vivo. Phenotypic analysis revealed that HDA15 is a negative regulator of hypocotyl cell elongation under both red and far-red light conditions in Arabidopsis () seedlings. The enzymatic activity of HDA15 is required for inhibition of hypocotyl elongation. Furthermore, HDA15 and HY5 act interdependently in the repression of hypocotyl cell elongation in photomorphogenesis. Genome-wide transcriptome analysis revealed that HDA15 and HY5 corepress the transcription of a subset of cell wall organization and auxin signaling-related genes. In addition, HDA15 is required for the function of HY5 in the repression of genes related to hypocotyl cell elongation in Arabidopsis seedlings. Moreover, HY5 recruits HDA15 to the promoters of target genes and represses gene expression by decreasing the levels of histone H4 acetylation in a light-dependent manner. Our study revealed a key transcription regulatory node in which HY5 interacts with HDA15 involved in repressing hypocotyl cell elongation to promote photomorphogenesis.

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