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-Structure paper
| タイトル | Structural basis of menaquinone reduction by succinate dehydrogenase from Chloroflexus aurantiacus. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 10782, Year 2025 |
| 掲載日 | 2025年11月28日 |
著者 | Xin Zhang / Jingyi Wu / Jiamao Wang / Huimin He / Aokun Liu / Xin Hong / Yuanyi Yu / Xinkai Pei / Xianjie Fang / Yueyong Xin / Lu Yu / Changlin Tian / Xiaoling Xu / ![]() |
| PubMed 要旨 | Succinate: menaquinone oxidoreductase (SQR) couples the oxidation of succinate with the reduction of menaquinone (MK) as part of the TCA cycle and the aerobic respiratory chain in MK-containing ...Succinate: menaquinone oxidoreductase (SQR) couples the oxidation of succinate with the reduction of menaquinone (MK) as part of the TCA cycle and the aerobic respiratory chain in MK-containing bacteria and archaea. Despite its significance, questions persist regarding the electron and proton transfer mechanisms that drive the endergonic MK reduction by succinate. In this study, we determine cryo-EM structures of succinate dehydrogenase (SDH) from Chloroflexus aurantiacus (CaSDH), a facultative filamentous anoxygenic phototroph (FAP) that forms one of the earliest branches of photosynthetic bacteria. The structures of trimeric CaSDH, resolved in both apo- and MK-bound forms, reveal a single membrane-anchoring subunit containing two b-type hemes, a canonical Q site, and a Q site with atypical location, configuration and specificity, each bound to MK molecules. Using structural analysis, EPR, and enzymatic assays, we uncover electron transfer pathways connecting succinate oxidation to MK reduction at the Q and Q sites. These findings provide structural insights into the electron and proton transfer mechanisms of MK-dependent diheme SQRs and establish a foundation for structure-based inhibitor design and antibacterial drug development targeting these enzymes. |
リンク | Nat Commun / PubMed:41315263 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.62 - 2.9 Å |
| 構造データ | EMDB-62932, PDB-9lay: EMDB-62933, PDB-9laz: EMDB-62934, PDB-9lb0: EMDB-62935, PDB-9lb1: |
| 化合物 | ![]() ChemComp-FAD: ![]() ChemComp-SIN: ![]() ChemComp-SF4: ![]() ChemComp-FES: ![]() ChemComp-F3S: ![]() ChemComp-HEM: ![]() ChemComp-LMT: ![]() ChemComp-PGV: ![]() ChemComp-PEV: ![]() ChemComp-MQ7: ![]() ChemComp-1L3: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Succinate: menaquinone oxidoreductase; membrane protein; complex II; electron transfer; MEMBRANE PROTEIN / succinate: menaquinone oxidoreductase; succinate dehydrogenase; electron transfer; MEMBRANE PROTEIN / Succinate: menaquinone oxidoreductase; 3-hydroxypropionate cycle; succinate dehydrogenase;electron transfer |
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chloroflexus aurantiacus j-10-fl (バクテリア)
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