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Title | Structure and assembly mechanism of plant CSM-type PSII-LHCII supercomplex. |
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Journal, issue, pages | Science, Vol. 357, Issue 6353, Page 815-820, Year 2017 |
Publish date | Aug 25, 2017 |
Authors | Xiaodong Su / Jun Ma / Xuepeng Wei / Peng Cao / Dongjie Zhu / Wenrui Chang / Zhenfeng Liu / Xinzheng Zhang / Mei Li / |
PubMed Abstract | In plants, the photosynthetic machinery photosystem II (PSII) consists of a core complex associated with variable numbers of light-harvesting complexes II (LHCIIs). The supercomplex, comprising a ...In plants, the photosynthetic machinery photosystem II (PSII) consists of a core complex associated with variable numbers of light-harvesting complexes II (LHCIIs). The supercomplex, comprising a dimeric core and two strongly bound and two moderately bound LHCIIs (CSM), is the dominant form in plants acclimated to limited light. Here we report cryo-electron microscopy structures of two forms of CSM (termed stacked and unstacked) from at 2.7- and 3.2-angstrom resolution, respectively. In each CSM, the moderately bound LHCII assembles specifically with a peripheral antenna complex CP24-CP29 heterodimer and the strongly bound LHCII, to establish a pigment network that facilitates light harvesting at the periphery and energy transfer into the core. The high mobility of peripheral antennae, including the moderately bound LHCII and CP24, provides insights into functional regulation of plant PSII. |
External links | Science / PubMed:28839073 |
Methods | EM (single particle) |
Resolution | 2.7 - 3.6 Å |
Structure data | EMDB-6741, PDB-5xnl: EMDB-6742, PDB-5xnm: |
Chemicals | ChemComp-CHL: ChemComp-CLA: ChemComp-LUT: ChemComp-XAT: ChemComp-NEX: ChemComp-LHG: ChemComp-BCR: ChemComp-OEX: ChemComp-FE2: ChemComp-CL: ChemComp-PHO: ChemComp-SQD: ChemComp-LMG: ChemComp-PL9: ChemComp-DGD: ChemComp-BCT: ChemComp-HEM: ChemComp-HOH: |
Source |
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Keywords | MEMBRANE PROTEIN / Photosystem II / PSII-LHCII / C2S2M2 / Supercomplex / M-LHCII and CP24 complexes / C2S2M2 supercomplex |