7y7a

In situ double-PBS-PSII-PSI-LHCs megacomplex from Porphyridium purpureum.

Loading... Status: waiting for Mol* initialization Structural highlights 7y7a is a 1320 chain structure with sequence from Porphyridium purpureum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 4.3Å Ligands: 3XQ, BCR, BCT, BGC, CL, CLA, CYC, DGD, FE, FES, GOL, HEM, LHG, LMG, MEN, OEX, PEB, PHO, PL9, PQN, PUB, SF4, ZEX Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A5J4YX19_PORPP Publication Abstract from PubMed In oxygenic photosynthetic organisms, light energy is captured by antenna systems and transferred to photosystem II (PSII) and photosystem I (PSI) to drive photosynthesis(1,2). The antenna systems of red algae consist of soluble phycobilisomes (PBSs) and transmembrane light-harvesting complexes (LHCs)(3). Excitation energy transfer pathways from PBS to photosystems remain unclear owing to the lack of structural information. Here we present in situ structures of PBS-PSII-PSI-LHC megacomplexes from the red alga Porphyridium purpureum at near-atomic resolution using cryogenic electron tomography and in situ single-particle analysis(4), providing interaction details between PBS, PSII and PSI. The structures reveal several unidentified and incomplete proteins and their roles in the assembly of the megacomplex, as well as a huge and sophisticated pigment network. This work provides a solid structural basis for unravelling the mechanisms of PBS-PSII-PSI-LHC megacomplex assembly, efficient energy transfer from PBS to the two photosystems, and regulation of energy distribution between PSII and PSI. In situ structure of the red algal phycobilisome-PSII-PSI-LHC megacomplex.,You X, Zhang X, Cheng J, Xiao Y, Ma J, Sun S, Zhang X, Wang HW, Sui SF Nature. 2023 Apr;616(7955):199-206. doi: 10.1038/s41586-023-05831-0. Epub 2023 , Mar 15. PMID:36922595 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Photosystem II 3D structures Phycocyanin

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