6yac
From Proteopedia
Plant PSI-ferredoxin supercomplex
Structural highlights
FunctionA0A0F6NFW5_PEA PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin.[ARBA:ARBA00003162][HAMAP-Rule:MF_00458] Publication Abstract from PubMedThe ability of photosynthetic organisms to use sunlight as a sole source of energy is endowed by two large membrane complexes-photosystem I (PSI) and photosystem II (PSII). PSI and PSII are the fundamental components of oxygenic photosynthesis, providing oxygen, food and an energy source for most living organisms on Earth. Currently, high-resolution crystal structures of these complexes from various organisms are available. The crystal structures of megadalton complexes have revealed excitation transfer and electron-transport pathways within the various complexes. PSI is defined as plastocyanin-ferredoxin oxidoreductase but a high-resolution structure of the entire triple supercomplex is not available. Here, using a new cryo-electron microscopy technique, we solve the structure of native plant PSI in complex with its electron donor plastocyanin and the electron acceptor ferredoxin. We reveal all of the contact sites and the modes of interaction between the interacting electron carriers and PSI. The structure of a triple complex of plant photosystem I with ferredoxin and plastocyanin.,Caspy I, Borovikova-Sheinker A, Klaiman D, Shkolnisky Y, Nelson N Nat Plants. 2020 Oct;6(10):1300-1305. doi: 10.1038/s41477-020-00779-9. Epub 2020 , Oct 5. PMID:33020607[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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