Structural basis and evolution of the photosystem I-light-harvesting supercomplex of cryptophyte algae.

Autor:	Zhao LS; State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China.; College of Marine Life Sciences & Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266003, China.; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China., Wang P; College of Marine Life Sciences & Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266003, China.; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China., Li K; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China., Zhang QB; State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China., He FY; State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China., Li CY; College of Marine Life Sciences & Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266003, China.; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China., Su HN; State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China.; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China., Chen XL; State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China.; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China., Liu LN; College of Marine Life Sciences & Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266003, China.; Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK., Zhang YZ; College of Marine Life Sciences & Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266003, China.; Laboratory for Marine Biology and Biotechnology, Laoshan Laboratory, Qingdao 266237, China.; State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao 266237, China.
Jazyk:	angličtina
Zdroj:	The Plant cell [Plant Cell] 2023 Jun 26; Vol. 35 (7), pp. 2449-2463.
DOI:	10.1093/plcell/koad087
Abstrakt:	Cryptophyte plastids originated from a red algal ancestor through secondary endosymbiosis. Cryptophyte photosystem I (PSI) associates with transmembrane alloxanthin-chlorophyll a/c proteins (ACPIs) as light-harvesting complexes (LHCs). Here, we report the structure of the photosynthetic PSI-ACPI supercomplex from the cryptophyte Chroomonas placoidea at 2.7-Å resolution obtained by crygenic electron microscopy. Cryptophyte PSI-ACPI represents a unique PSI-LHCI intermediate in the evolution from red algal to diatom PSI-LHCI. The PSI-ACPI supercomplex is composed of a monomeric PSI core containing 14 subunits, 12 of which originated in red algae, 1 diatom PsaR homolog, and an additional peptide. The PSI core is surrounded by 14 ACPI subunits that form 2 antenna layers: an inner layer with 11 ACPIs surrounding the PSI core and an outer layer containing 3 ACPIs. A pigment-binding subunit that is not present in any other previously characterized PSI-LHCI complexes, ACPI-S, mediates the association and energy transfer between the outer and inner ACPIs. The extensive pigment network of PSI-ACPI ensures efficient light harvesting, energy transfer, and dissipation. Overall, the PSI-LHCI structure identified in this study provides a framework for delineating the mechanisms of energy transfer in cryptophyte PSI-LHCI and for understanding the evolution of photosynthesis in the red lineage, which occurred via secondary endosymbiosis. Competing Interests: Conflict of interest statement. None declared. (© The Author(s) 2023. Published by Oxford University Press on behalf of American Society of Plant Biologists.)
Databáze:	MEDLINE
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