biostudies-literatureZhang XYouth Innovation Promotion Association of the Chinese Academy of Sciences (Youth Innovation Promotion Association CAS)National Natural Science Foundation of China (National Science Foundation of China)10782https://www.ebi.ac.uk/biostudies/studies/S-EPMC12663545biostudies-literatureUnknown16(1)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_P site, and a Q_D 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_P and Q_D 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.Nature communicationsStructural basis of menaquinone reduction by succinate dehydrogenase from Chloroflexus aurantiacus.PMC126635453157073831870740224370052022455Wu JYu LHe HTian CWang JFang XHong XZhang XLiu APei XXu XYu YXin YfalseStructural basis of menaquinone reduction by succinate dehydrogenase from Chloroflexus aurantiacus.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_P site, and a Q_D 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_P and Q_D 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.2025-01-01T00:00:00Z2025 Nov2026-06-06T07:12:31.623Z2026-06-06T03:06:46.573ZS-EPMC126635454131526310.1038/s41467-025-65828-3