molybdopterin cofactor binding / oxidoreductase activity / electron transfer activity / heme binding / membrane / metal ion binding / plasma membrane 類似検索 - 分子機能
Menaquinone reductase, multiheme cytochrome c subunit / NrfD family / Alternative complex III, ActD subunit / MoCo/4Fe-4S cofactor protein extended Tat translocation domain / Polysulphide reductase, NrfD / Alternative complex III, ActD subunit / Cytochrome c7-like / Cytochrome c7 and related cytochrome c / Cytochrome C oxidase, cbb3-type, subunit III / Molybdopterin dinucleotide-binding domain ...Menaquinone reductase, multiheme cytochrome c subunit / NrfD family / Alternative complex III, ActD subunit / MoCo/4Fe-4S cofactor protein extended Tat translocation domain / Polysulphide reductase, NrfD / Alternative complex III, ActD subunit / Cytochrome c7-like / Cytochrome c7 and related cytochrome c / Cytochrome C oxidase, cbb3-type, subunit III / Molybdopterin dinucleotide-binding domain / Molydopterin dinucleotide binding domain / Multiheme cytochrome superfamily / Aspartate decarboxylase-like domain superfamily / 4Fe-4S dicluster domain / Cytochrome c family profile. / Cytochrome c-like domain / Cytochrome c-like domain superfamily / Twin arginine translocation (Tat) signal profile. / Twin-arginine translocation pathway, signal sequence / 4Fe-4S ferredoxin-type iron-sulfur binding domain profile. / 4Fe-4S ferredoxin-type, iron-sulphur binding domain 類似検索 - ドメイン・相同性
Cytochrome_C7 domain-containing protein / Fe-S-cluster-containing hydrogenase components 1-like protein / Polysulphide reductase NrfD / DUF3341 domain-containing protein / Cytochrome c domain-containing protein / Quinol:cytochrome C oxidoreductase 類似検索 - 構成要素
National Natural Science Foundation of China (NSFC)
31570738
中国
National Natural Science Foundation of China (NSFC)
31400630
中国
National Natural Science Foundation of China (NSFC)
31870740
中国
Ministry of Science and Technology (MoST, China)
2017YFA0504700
中国
Chinese Academy of Sciences
XDB08030202
中国
引用
ジャーナル: Sci Adv / 年: 2020 タイトル: Cryo-EM structures of the air-oxidized and dithionite-reduced photosynthetic alternative complex III from . 著者: Yang Shi / Yueyong Xin / Chao Wang / Robert E Blankenship / Fei Sun / Xiaoling Xu / 要旨: Alternative complex III (ACIII) is a multisubunit quinol:electron acceptor oxidoreductase that couples quinol oxidation with transmembrane proton translocation in both the respiratory and ...Alternative complex III (ACIII) is a multisubunit quinol:electron acceptor oxidoreductase that couples quinol oxidation with transmembrane proton translocation in both the respiratory and photosynthetic electron transport chains of bacteria. The coupling mechanism, however, is poorly understood. Here, we report the cryo-EM structures of air-oxidized and dithionite-reduced ACIII from the photosynthetic bacterium at 3.3- and 3.5-Å resolution, respectively. We identified a menaquinol binding pocket and an electron transfer wire comprising six hemes and four iron-sulfur clusters that is capable of transferring electrons to periplasmic acceptors. We detected a proton translocation passage in which three strictly conserved, mid-passage residues are likely essential for coupling the redox-driven proton translocation across the membrane. These results allow us to propose a previously unrecognized coupling mechanism that links the respiratory and photosynthetic functions of ACIII. This study provides a structural basis for further investigation of the energy transformation mechanisms in bacterial photosynthesis and respiration.