- EMDB-35989: Cryo-EM structure of native RC-LH complex from Roseiflexus casten... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-35989
タイトル
Cryo-EM structure of native RC-LH complex from Roseiflexus castenholzii at 2,000lux
マップデータ
試料
複合体: the native RC-LH complex at 2,000lux
タンパク質・ペプチド: x 8種
リガンド: x 7種
キーワード
RC-LH core complex / PHOTOSYNTHESIS
機能・相同性
機能・相同性情報
organelle inner membrane / plasma membrane light-harvesting complex / bacteriochlorophyll binding / photosynthesis, light reaction / photosynthetic electron transport in photosystem II / chlorophyll binding / electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity / electron transfer activity / iron ion binding / heme binding ...organelle inner membrane / plasma membrane light-harvesting complex / bacteriochlorophyll binding / photosynthesis, light reaction / photosynthetic electron transport in photosystem II / chlorophyll binding / electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity / electron transfer activity / iron ion binding / heme binding / membrane / metal ion binding / plasma membrane 類似検索 - 分子機能
Photosynthetic reaction centre, cytochrome c subunit / Multihaem cytochrome, PRC subunit superfamily / Photosynthetic reaction centre cytochrome C subunit / Antenna complex, alpha subunit conserved site / Antenna complexes alpha subunits signature. / Antenna complex, alpha/beta subunit / Light-harvesting protein B beta chain / Antenna complex, beta domain superfamily / Antenna complex alpha/beta subunit / Light-harvesting complex ...Photosynthetic reaction centre, cytochrome c subunit / Multihaem cytochrome, PRC subunit superfamily / Photosynthetic reaction centre cytochrome C subunit / Antenna complex, alpha subunit conserved site / Antenna complexes alpha subunits signature. / Antenna complex, alpha/beta subunit / Light-harvesting protein B beta chain / Antenna complex, beta domain superfamily / Antenna complex alpha/beta subunit / Light-harvesting complex / Photosynthetic reaction centre, L subunit / Multiheme cytochrome superfamily / Photosynthetic reaction centre, L/M / Photosystem II protein D1/D2 superfamily / Photosynthetic reaction centre protein / Photosynthetic reaction center proteins signature. 類似検索 - ドメイン・相同性
Uncharacterized protein / Reaction center protein L chain / Alpha subunit of light-harvesting 1 / Beta subunit of light-harvesting 1 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Elife / 年: 2023 タイトル: Carotenoid assembly regulates quinone diffusion and the reaction center-light harvesting complex architecture. 著者: Jiyu Xin / Yang Shi / Xin Zhang / Xinyi Yuan / Yueyong Xin / Huimin He / Jiejie Shen / Robert E Blankenship / Xiaoling Xu / 要旨: Carotenoid (Car) pigments perform central roles in photosynthesis-related light harvesting (LH), photoprotection, and assembly of functional pigment-protein complexes. However, the relationships ...Carotenoid (Car) pigments perform central roles in photosynthesis-related light harvesting (LH), photoprotection, and assembly of functional pigment-protein complexes. However, the relationships between Car depletion in the LH, assembly of the prokaryotic reaction center (RC)-LH complex, and quinone exchange are not fully understood. Here, we analyzed native RC-LH (nRC-LH) and Car-depleted RC-LH (dRC-LH) complexes in , a chlorosome-less filamentous anoxygenic phototroph that forms the deepest branch of photosynthetic bacteria. Newly identified exterior Cars functioned with the bacteriochlorophyll B800 to block the proposed quinone channel between LHαβ subunits in the nRC-LH, forming a sealed LH ring that was disrupted by transmembrane helices from cytochrome and subunit X to allow quinone shuttling. dRC-LH lacked subunit X, leading to an exposed LH ring with a larger opening, which together accelerated the quinone exchange rate. We also assigned amino acid sequences of subunit X and two hypothetical proteins Y and Z that functioned in forming the quinone channel and stabilizing the RC-LH interactions. This study reveals the structural basis by which Cars assembly regulates the architecture and quinone exchange of bacterial RC-LH complexes. These findings mark an important step forward in understanding the evolution and diversity of prokaryotic photosynthetic apparatus.
名称: Reaction center protein L chain / タイプ: protein_or_peptide / ID: 4 詳細: The L- and M-subunits of the RC are encoded by a fused gene pufLM but post-translational processed into two discrete subunits each containing six and five transmembrane helices コピー数: 1 / 光学異性体: LEVO
名称: Reaction center protein M chain / タイプ: protein_or_peptide / ID: 5 詳細: The L- and M-subunits of the RC are encoded by a fused gene pufLM but post-translational processed into two discrete subunits each containing six and five transmembrane helices コピー数: 1 / 光学異性体: LEVO