5XNN image
Entry Detail
PDB ID:
5XNN
EMDB ID:
Title:
Structure of M-LHCII and CP24 complexes in the stacked C2S2M2-type PSII-LHCII supercomplex from Pisum sativum
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2017-05-23
Release Date:
2017-09-20
Method Details:
Experimental Method:
Resolution:
3.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Chlorophyll a-b binding protein 8, chloroplastic
Chain IDs:A (auth: 1), B (auth: 2)
Chain Length:232
Number of Molecules:2
Biological Source:Pisum sativum
Polymer Type:polypeptide(L)
Description:Chlorophyll a-b binding protein, chloroplastic
Chain IDs:C (auth: 3)
Chain Length:243
Number of Molecules:1
Biological Source:Pisum sativum
Polymer Type:polypeptide(L)
Description:Light harvesting chlorophyll a/b-binding protein Lhcb6, CP24
Chain IDs:D (auth: 4)
Chain Length:210
Number of Molecules:1
Biological Source:Pisum sativum
Primary Citation
Structure and assembly mechanism of plant C2S2M2-type PSII-LHCII supercomplex
Science 357 815 820 (2017)
PMID: 28839073 DOI: 10.1126/science.aan0327

Abstact

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 (C2S2M2), is the dominant form in plants acclimated to limited light. Here we report cryo-electron microscopy structures of two forms of C2S2M2 (termed stacked and unstacked) from Pisum sativum at 2.7- and 3.2-angstrom resolution, respectively. In each C2S2M2, 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.

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