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Yang X, Che Y, García VJ, Shen J, Zheng Y, Su Z, Zhu L, Luan S, Hou X. Cyclophilin 37 maintains electron transport via the cytochrome b6/f complex under high light in Arabidopsis. Plant Physiol 2023:7152940. [PMID: 37144829 DOI: 10.1093/plphys/kiad268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/24/2023] [Accepted: 04/06/2023] [Indexed: 05/06/2023]
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 conditions, the balance of electron flux in the ETC is disturbed, which leads to 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, plays an essential role in regulating the ETC and initiating photoprotection. However, how the Cyt b6/f complex is maintained under high light 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 photosystem I under high light 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 high light.
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Affiliation(s)
- Xiaoxia Yang
- State Key Laboratory of Hybrid Rice, Hubei Hongshan Laboratory, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Yufen Che
- Department of Plant & Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720
| | - Veder J García
- Department of Plant & Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720
| | - Jianqiang Shen
- Department of Plant & Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720
| | - Yutong Zheng
- State Key Laboratory of Hybrid Rice, Hubei Hongshan Laboratory, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Zhezheng Su
- State Key Laboratory of Hybrid Rice, Hubei Hongshan Laboratory, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Li Zhu
- State Key Laboratory of Hybrid Rice, Hubei Hongshan Laboratory, College of Life Sciences, Wuhan University, Wuhan 430072, China
| | - Sheng Luan
- Department of Plant & Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720
| | - Xin Hou
- State Key Laboratory of Hybrid Rice, Hubei Hongshan Laboratory, College of Life Sciences, Wuhan University, Wuhan 430072, China
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