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Title | Structure of a unique PSII-Pcb tetrameric megacomplex in a chlorophyll -containing cyanobacterium. |
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Journal, issue, pages | Sci Adv, Vol. 10, Issue 8, Page eadk7140, Year 2024 |
Publish date | Feb 23, 2024 |
Authors | Liangliang Shen / Yuanzhu Gao / Kailu Tang / Ruxi Qi / Lutang Fu / Jing-Hua Chen / Wenda Wang / Xiaomin Ma / Peiyao Li / Min Chen / Tingyun Kuang / Xing Zhang / Jian-Ren Shen / Peiyi Wang / Guangye Han / |
PubMed Abstract | is a unique cyanobacterium using chlorophyll (Chl ) as its major pigment and thus can use far-red light for photosynthesis. Photosystem II (PSII) of associates with a number of prochlorophyte Chl- ... is a unique cyanobacterium using chlorophyll (Chl ) as its major pigment and thus can use far-red light for photosynthesis. Photosystem II (PSII) of associates with a number of prochlorophyte Chl-binding (Pcb) proteins to act as the light-harvesting system. We report here the cryo-electron microscopic structure of a PSII-Pcb megacomplex from at a 3.6-angstrom overall resolution and a 3.3-angstrom local resolution. The megacomplex is organized as a tetramer consisting of two PSII core dimers flanked by sixteen symmetrically related Pcb proteins, with a total molecular weight of 1.9 megadaltons. The structure reveals the detailed organization of PSII core consisting of 15 known protein subunits and an unknown subunit, the assembly of 4 Pcb antennas within each PSII monomer, and possible pathways of energy transfer within the megacomplex, providing deep insights into energy transfer and dissipation mechanisms within the PSII-Pcb megacomplex involved in far-red light utilization. |
External links | Sci Adv / PubMed:38394197 / PubMed Central |
Methods | EM (single particle) |
Resolution | 3.3 - 3.6 Å |
Structure data | EMDB-33929, PDB-7ymi: EMDB-33933, PDB-7ymm: |
Chemicals | ChemComp-CL7: ChemComp-PHO: ChemComp-8CT: ChemComp-SQD: ChemComp-LHG: ChemComp-LMG: ChemComp-DGD: ChemComp-FE2: ChemComp-BCT: ChemComp-PL9: ChemComp-HEM: ChemComp-ZEX: |
Source |
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Keywords | PHOTOSYNTHESIS / Photosystem II / Pcb |