8wb4

Structure of PSII-ACPII supercomplex from cryptophyte algae

spinqualitylabelsall models 8wb4, resolution 2.47Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8wb4 is a 20 chain structure with sequence from Chroomonas placoidea. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.47Å Ligands: 8CT, BCT, CL, CLA, DGD, FE2, HEM, IHT, II0, II3, KC2, LHG, LMG, OEX, PHO, PL9, SQD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function L1IFP3_GUITC Publication Abstract from PubMed Cryptophyte algae are an evolutionarily distinct and ecologically important group of photosynthetic unicellular eukaryotes. Photosystem II (PSII) of cryptophyte algae associates with alloxanthin chlorophyll a/c-binding proteins (ACPs) to act as the peripheral light-harvesting system, whose supramolecular organization is unknown. Here, we purify the PSII-ACPII supercomplex from a cryptophyte alga Chroomonas placoidea (C. placoidea), and analyze its structure at a resolution of 2.47 A using cryo-electron microscopy. This structure reveals a dimeric organization of PSII-ACPII containing two PSII core monomers flanked by six symmetrically arranged ACPII subunits. The PSII core is conserved whereas the organization of ACPII subunits exhibits a distinct pattern, different from those observed so far in PSII of other algae and higher plants. Furthermore, we find a Chl a-binding antenna subunit, CCPII-S, which mediates interaction of ACPII with the PSII core. These results provide a structural basis for the assembly of antennas within the supercomplex and possible excitation energy transfer pathways in cryptophyte algal PSII, shedding light on the diversity of supramolecular organization of photosynthetic machinery. Structure and distinct supramolecular organization of a PSII-ACPII dimer from a cryptophyte alga Chroomonas placoidea.,Mao Z, Li X, Li Z, Shen L, Li X, Yang Y, Wang W, Kuang T, Shen JR, Han G Nat Commun. 2024 May 28;15(1):4535. doi: 10.1038/s41467-024-48878-x. PMID:38806516 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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