Cyclophilin 37 maintains electron transport via the cytochrome b6/f complex under high light in Arabidopsis

Author:

Yang Xiaoxia1ORCID,Che Yufen2ORCID,García Veder J2ORCID,Shen Jianqiang2ORCID,Zheng Yutong1,Su Zhezheng1ORCID,Zhu Li1,Luan Sheng2ORCID,Hou Xin1ORCID

Affiliation:

1. State Key Laboratory of Hybrid Rice, Hubei Hongshan Laboratory, College of Life Sciences, Wuhan University , Wuhan 430072 , China

2. Department of Plant & Microbial Biology, University of California , 111 Koshland Hall, Berkeley, CA 94720 , USA

Abstract

Abstract Plants have evolved multiple mechanisms to cope with diverse types of light stress, particularly the regulation of the electron transport chain (ETC). Under high light (HL) conditions, the balance of electron flux in the ETC is disturbed, which leads to the overaccumulation of reactive oxygen species (ROS) and results in photodamage and photoinhibition. The cytochrome (Cyt) b6/f complex, which coordinates electron transfer between photosystems I and II (PSI and PSII), plays an essential role in regulating the ETC and initiating photoprotection. However, how the Cyt b6/f complex is maintained under HL conditions remains unclear. Here, we report that the activity of the Cyt b6/f complex is sustained by thylakoid-localized cyclophilin 37 (CYP37) in Arabidopsis (Arabidopsis thaliana). Compared with wild-type plants, cyp37 mutants displayed an imbalance in electron transport from Cyt b6/f to PSI under HL stress, which led to increased ROS accumulation, decreased anthocyanin biosynthesis, and increased chlorophyll degradation. Surprisingly, CYP37's role in regulating ETC balance was independent of photosynthesis control, which was indicated by a higher Y (ND), an indicator of P700 oxidation in PSI. Furthermore, the interaction between CYP37 and photosynthetic electron transfer A (PetA), a subunit of the Cyt b6/f complex, suggests that the central function of CYP37 is to maintain Cyt b6/f complex activity rather than to serve as an assembly factor. Our study provides insights into how plants balance electron flow between PSII and PSI via Cyt b6/f complex under HL.

Funder

National Key R&D Program of China

Hubei Provincial Natural Science Foundation of China

Foundation of Hubei Hongshan Laboratory

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Genetics,Physiology

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