- EMDB-39177: Cryo-EM structure of CaRC-LH complex from Chloroflexus aurantiacus -
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基本情報
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データベース: EMDB / ID: EMD-39177
タイトル
Cryo-EM structure of CaRC-LH complex from Chloroflexus aurantiacus
マップデータ
試料
複合体: Cryo-EM structure of CaRC-LH complex from Chloroflexus aurantiacus
タンパク質・ペプチド: x 6種
リガンド: x 7種
キーワード
PHOTOSYNTHESIS
機能・相同性
機能・相同性情報
organelle inner membrane / plasma membrane light-harvesting complex / bacteriochlorophyll binding / photosystem II / photosynthetic electron transport in photosystem II / photosynthesis, light reaction / : / periplasmic space / electron transfer activity / iron ion binding ...organelle inner membrane / plasma membrane light-harvesting complex / bacteriochlorophyll binding / photosystem II / photosynthetic electron transport in photosystem II / photosynthesis, light reaction / : / periplasmic space / electron transfer activity / iron ion binding / heme binding / 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, beta subunit, conserved site / Antenna complexes beta subunits signature. / Antenna complex, alpha subunit / Antenna complex, alpha subunit conserved site / Antenna complexes alpha subunits signature. / Antenna complex, alpha/beta subunit ...: / Photosynthetic reaction centre, cytochrome c subunit / Multihaem cytochrome, PRC subunit superfamily / Photosynthetic reaction centre cytochrome C subunit / Antenna complex, beta subunit, conserved site / Antenna complexes beta subunits signature. / Antenna complex, alpha 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 / Multiheme cytochrome c family profile. / Photosynthetic reaction centre, M subunit / 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
Light-harvesting protein B-808/866 alpha chain / Reaction center protein M chain / Light-harvesting protein B-808/866 beta chain / Reaction center protein L chain / Cytochrome c-554 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: J Integr Plant Biol / 年: 2025 タイトル: Cryo-EM structure of a minimal reaction center-light-harvesting complex from the phototrophic bacterium Chloroflexus aurantiacus. 著者: Guoqiang Huang / Shishang Dong / Lin Ma / Lin Li / Jinxin Ju / Mei-Jiao Wang / Jian-Ping Zhang / Sen-Fang Sui / Xiaochun Qin / 要旨: Photosynthetic organisms have developed various light-harvesting antenna systems to capture light and transfer energy to reaction centers (RCs). Simultaneous utilization of the integral membrane ...Photosynthetic organisms have developed various light-harvesting antenna systems to capture light and transfer energy to reaction centers (RCs). Simultaneous utilization of the integral membrane light-harvesting antenna (LH complex) and the extrinsic antenna (chlorosomes) makes the phototrophic bacterium Chloroflexus (Cfx.) aurantiacus an ideal model for studying filamentous anoxygenic phototrophs (FAPs). Here, we determined the structure of a minimal RC-LH photocomplex from Cfx. aurantiacus J-10-fl (CaRC-LH) at 3.05-Å resolution. The CaRC-LH binds only to seven LH subunits, which form a crescent-shaped antenna surrounding the movable menaquinone-10 (Q) binding site of CaRC. In this complex with minimal LH units, an extra antenna is required to ensure sufficient light-gathering, providing a clear explanation for the presence of chlorosomes in Cfx. aurantiacus. More importantly, the semicircle of the antenna represents a novel RC-LH assembly pattern. Our structure provides a basis for understanding the existence of chlorosomes in Cfx. aurantiacus and the possible assembly pattern of RC-LH.