- EMDB-51939: Cryo-EM structure of the atovaquone-inhibited Complex III from th... -
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基本情報
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データベース: EMDB / ID: EMD-51939
タイトル
Cryo-EM structure of the atovaquone-inhibited Complex III from the Chlorocebus sabaeus respirasome
マップデータ
試料
複合体: mitochondrial respirasome from Chlorocebus sabaeus Vero cells inhibited by atovaquone
タンパク質・ペプチド: x 10種
リガンド: x 10種
キーワード
complex III / respirasome / mitochondria / green african monkey / atovaquone / ELECTRON TRANSPORT
機能・相同性
機能・相同性情報
subthalamus development / pons development / cerebellar Purkinje cell layer development / pyramidal neuron development / thalamus development / mitochondrial respiratory chain complex III assembly / respiratory chain complex III / quinol-cytochrome-c reductase / quinol-cytochrome-c reductase activity / mitochondrial electron transport, ubiquinol to cytochrome c ...subthalamus development / pons development / cerebellar Purkinje cell layer development / pyramidal neuron development / thalamus development / mitochondrial respiratory chain complex III assembly / respiratory chain complex III / quinol-cytochrome-c reductase / quinol-cytochrome-c reductase activity / mitochondrial electron transport, ubiquinol to cytochrome c / hypothalamus development / midbrain development / hippocampus development / respiratory electron transport chain / metalloendopeptidase activity / 2 iron, 2 sulfur cluster binding / electron transfer activity / mitochondrial inner membrane / heme binding / proteolysis / nucleoplasm / metal ion binding 類似検索 - 分子機能
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Structure, assembly and inhibition of the Toxoplasma gondii respiratory chain supercomplex. 著者: Andrew E MacLean / Shikha Shikha / Mariana Ferreira Silva / Max J Gramelspacher / Aaron Nilsen / Katherine M Liebman / Sovitj Pou / Rolf W Winter / Amit Meir / Michael K Riscoe / J Stone ...著者: Andrew E MacLean / Shikha Shikha / Mariana Ferreira Silva / Max J Gramelspacher / Aaron Nilsen / Katherine M Liebman / Sovitj Pou / Rolf W Winter / Amit Meir / Michael K Riscoe / J Stone Doggett / Lilach Sheiner / Alexander Mühleip / 要旨: The apicomplexan mitochondrial electron transport chain is essential for parasite survival and displays a divergent subunit composition. Here we report cryo-electron microscopy structures of an ...The apicomplexan mitochondrial electron transport chain is essential for parasite survival and displays a divergent subunit composition. Here we report cryo-electron microscopy structures of an apicomplexan III-IV supercomplex and of the drug target complex III. The supercomplex structure reveals how clade-specific subunits form an apicomplexan-conserved III-IV interface with a unique, kinked architecture, suggesting that supercomplexes evolved independently in different eukaryotic lineages. A knockout resulting in supercomplex disassembly challenges the proposed role of III-IV in electron transfer efficiency as suggested for mammals. Nevertheless, knockout analysis indicates that III-IV is critical for parasite fitness. The complexes from the model parasite Toxoplasma gondii were inhibited with the antimalarial atovaquone, revealing interactions underpinning species specificity. They were also inhibited with endochin-like quinolone (ELQ)-300, an inhibitor in late-stage preclinical development. Notably, in the apicomplexan binding site, ELQ-300 is flipped compared with related compounds in the mammalian enzyme. On the basis of the binding modes and parasite-specific interactions discovered, we designed more potent ELQs with subnanomolar activity against T. gondii. Our findings reveal critical evolutionary differences in the role of supercomplexes in mitochondrial biology and provide insight into cytochrome b inhibition, informing future drug discovery.