title: BPG3 is a novel chloroplast protein that involves the greening of leaves and related to brassinosteroid signaling.
abstract: Brassinosteroids are plant steroid hormones that regulate plant organs and chloroplast development. The detailed molecular mechanism for plant development by BR signaling is yet to be revealed, and many points regarding the relationship between BR signaling and chloroplast development remain unknown. We identify here the dominant mutant Brz-insensitive-pale green3-1D (bpg3-1D) from the Arabidopsis FOX lines that show reduced sensitivity to the chlorophyll accumulation promoted by the BR biosynthesis inhibitor, Brassinazole (Brz), in the light. BPG3 encodes a novel chloroplast protein that is evolutionally conserved in bacteria, algae, and higher plants. The expression of BPG3 was induced by light and Brz. The inhibition of electron transport in photosystem II of the chloroplasts was detected in bpg3-1D. These results suggest that BPG3 played an important role in regulating photosynthesis in the chloroplast under BR signaling.
authors.affiliation: a Antibiotic Lab , RIKEN , Wako , Japan.
authors.forename: Eriko
authors.initials: E
authors.lastname: Yoshizawa
authors.forename: Mai
authors.initials: M
authors.lastname: Kaizuka
authors.forename: Ayumi
authors.initials: A
authors.lastname: Yamagami
authors.forename: Mieko
authors.initials: M
authors.lastname: Higuchi-Takeuchi
authors.forename: Minami
authors.initials: M
authors.lastname: Matsui
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kakei
authors.forename: Yukihisa
authors.initials: Y
authors.lastname: Shimada
authors.forename: Masaaki
authors.initials: M
authors.lastname: Sakuta
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Osada
authors.forename: Tadao
authors.initials: T
authors.lastname: Asami
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development; D029681:Arabidopsis Proteins / Q000235:genetics*; D060406:Brassinosteroids / Q000378:metabolism*; D060365:Chloroplast Proteins / Q000235:genetics*; D002736:Chloroplasts / Q000235:genetics*; D018506:Gene Expression Regulation, Plant; D008027:Light; D010788:Photosynthesis / Q000235:genetics*; D018515:Plant Leaves / Q000235:genetics* / Q000254:growth & development; D036226:Seedlings / Q000235:genetics; D015398:Signal Transduction / Q000235:genetics
chemical_list: D029681:Arabidopsis Proteins; C000596381:BPG3 protein, Arabidopsis; D060406:Brassinosteroids; D060365:Chloroplast Proteins
keywords: Brz; brassinosteroid; chemical biology; chloroplast regulator; signaling