Phytochrome B interacts with SWC6 and ARP6 to regulate H2A.Z deposition and photomorphogensis in Arabidopsis.
ARP6
H2A.Z
SWC6
hypocotyl elongation
photomorphogenesis
phytochrome B
red light
Journal
Journal of integrative plant biology
ISSN: 1744-7909
Titre abrégé: J Integr Plant Biol
Pays: China (Republic : 1949- )
ID NLM: 101250502
Informations de publication
Date de publication:
Jun 2021
Jun 2021
Historique:
received:
06
05
2021
accepted:
08
05
2021
pubmed:
14
5
2021
medline:
5
8
2021
entrez:
13
5
2021
Statut:
ppublish
Résumé
Light serves as a crucial environmental cue which modulates plant growth and development, and which is controlled by multiple photoreceptors including the primary red light photoreceptor, phytochrome B (phyB). The signaling mechanism of phyB involves direct interactions with a group of basic helix-loop-helix (bHLH) transcription factors, PHYTOCHROME-INTERACTING FACTORS (PIFs), and the negative regulators of photomorphogenesis, COP1 and SPAs. H2A.Z is an evolutionarily conserved H2A variant which plays essential roles in transcriptional regulation. The replacement of H2A with H2A.Z is catalyzed by the SWR1 complex. Here, we show that the Pfr form of phyB physically interacts with the SWR1 complex subunits SWC6 and ARP6. phyB and ARP6 co-regulate numerous genes in the same direction, some of which are associated with auxin biosynthesis and response including YUC9, which encodes a rate-limiting enzyme in the tryptophan-dependent auxin biosynthesis pathway. Moreover, phyB and HY5/HYH act to inhibit hypocotyl elongation partially through repression of auxin biosynthesis. Based on our findings and previous studies, we propose that phyB promotes H2A.Z deposition at YUC9 to inhibit its expression through direct phyB-SWC6/ARP6 interactions, leading to repression of auxin biosynthesis, and thus inhibition of hypocotyl elongation in red light.
Substances chimiques
Arabidopsis Proteins
0
Phytochrome B
136250-22-1
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1133-1146Informations de copyright
© 2021 Institute of Botany, Chinese Academy of Sciences.
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