- EMDB-15017: 3.15 Angstrom cryo-EM structure of the dimeric cytochrome b6f com... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-15017
タイトル
3.15 Angstrom cryo-EM structure of the dimeric cytochrome b6f complex from Synechocystis sp. PCC 6803 with natively bound plastoquinone and lipid molecules.
マップデータ
試料
複合体: Cytochrome b6f with natively associated lipids and plastoquinone
タンパク質・ペプチド: x 5種
タンパク質・ペプチド: x 3種
リガンド: x 7種
キーワード
cytochrome bc complexes / electron transfer / cytochrome b6f / photosynthesis / cyanobacteria / OXIDOREDUCTASE
機能・相同性
機能・相同性情報
cytochrome b6f complex / plastoquinol-plastocyanin reductase / plastoquinol--plastocyanin reductase activity / : / cytochrome complex assembly / photosynthetic electron transport chain / plasma membrane-derived thylakoid membrane / : / membrane => GO:0016020 / photosynthesis ...cytochrome b6f complex / plastoquinol-plastocyanin reductase / plastoquinol--plastocyanin reductase activity / : / cytochrome complex assembly / photosynthetic electron transport chain / plasma membrane-derived thylakoid membrane / : / membrane => GO:0016020 / photosynthesis / respiratory electron transport chain / 2 iron, 2 sulfur cluster binding / electron transfer activity / oxidoreductase activity / iron ion binding / heme binding / metal ion binding / membrane / plasma membrane 類似検索 - 分子機能
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/M011151/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/V006630/1
英国
Leverhulme Trust
RPG-2019-045
英国
引用
ジャーナル: Biochem J / 年: 2022 タイトル: Cryo-EM structures of the Synechocystis sp. PCC 6803 cytochrome b6f complex with and without the regulatory PetP subunit. 著者: Matthew S Proctor / Lorna A Malone / David A Farmer / David J K Swainsbury / Frederick R Hawkings / Federica Pastorelli / Thomas Z Emrich-Mills / C Alistair Siebert / C Neil Hunter / Matthew ...著者: Matthew S Proctor / Lorna A Malone / David A Farmer / David J K Swainsbury / Frederick R Hawkings / Federica Pastorelli / Thomas Z Emrich-Mills / C Alistair Siebert / C Neil Hunter / Matthew P Johnson / Andrew Hitchcock / 要旨: In oxygenic photosynthesis, the cytochrome b6f (cytb6f) complex links the linear electron transfer (LET) reactions occurring at photosystems I and II and generates a transmembrane proton gradient via ...In oxygenic photosynthesis, the cytochrome b6f (cytb6f) complex links the linear electron transfer (LET) reactions occurring at photosystems I and II and generates a transmembrane proton gradient via the Q-cycle. In addition to this central role in LET, cytb6f also participates in a range of processes including cyclic electron transfer (CET), state transitions and photosynthetic control. Many of the regulatory roles of cytb6f are facilitated by auxiliary proteins that differ depending upon the species, yet because of their weak and transient nature the structural details of these interactions remain unknown. An apparent key player in the regulatory balance between LET and CET in cyanobacteria is PetP, a ∼10 kDa protein that is also found in red algae but not in green algae and plants. Here, we used cryogenic electron microscopy to determine the structure of the Synechocystis sp. PCC 6803 cytb6f complex in the presence and absence of PetP. Our structures show that PetP interacts with the cytoplasmic side of cytb6f, displacing the C-terminus of the PetG subunit and shielding the C-terminus of cytochrome b6, which binds the heme cn cofactor that is suggested to mediate CET. The structures also highlight key differences in the mode of plastoquinone binding between cyanobacterial and plant cytb6f complexes, which we suggest may reflect the unique combination of photosynthetic and respiratory electron transfer in cyanobacterial thylakoid membranes. The structure of cytb6f from a model cyanobacterial species amenable to genetic engineering will enhance future site-directed mutagenesis studies of structure-function relationships in this crucial ET complex.