ジャーナル: Antioxid Redox Signal / 年: 2022 タイトル: A Dynamic Substrate Pool Revealed by cryo-EM of a Lipid-Preserved Respiratory Supercomplex. 著者: Tae Jin Jeon / Seong-Gyu Lee / Suk Hyun Yoo / Myeongbin Kim / Dabin Song / Joonghyun Ryu / Hwangseo Park / Deok-Soo Kim / Jaekyung Hyun / Ho Min Kim / Seong Eon Ryu / 要旨: Mitochondrial respiratory supercomplexes mediate redox electron transfer, generating a proton gradient for ATP synthesis. To provide structural information on the function of supercomplexes in ... Mitochondrial respiratory supercomplexes mediate redox electron transfer, generating a proton gradient for ATP synthesis. To provide structural information on the function of supercomplexes in physiologically relevant conditions, we conducted cryoelectron microscopy studies with supercomplexes in a lipid-preserving state. Here, we present cryoelectron microscopy structures of bovine respiratory supercomplex IIIIIV by using a lipid-preserving sample preparation. The preparation greatly enhances the intercomplex quinone transfer activity. The structures reveal large intercomplex motions that result in different shapes and sizes of the intercomplex space between complexes I and III, forming a dynamic substrate pool. Biochemical and structural analyses indicated that intercomplex phospholipids mediate the intercomplex motions. An analysis of the different classes of focus-refined complex I showed that structural switches due to quinone reduction led to the formation of a novel channel that could transfer reduced quinones to the intercomplex substrate pool. Our results indicate potential mechanism for the facilitated electron transfer involving a dynamic substrate pool and intercomplex movement by which supercomplexes play an active role in the regulation of metabolic flux and reactive oxygen species.
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2020年11月24日
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2022年5月18日
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2022年5月18日
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Cytochromeb-c1complexsubunit7 / Complex III subunit 7 / Complex III subunit VII / QP-C / Ubiquinol-cytochrome c reductase complex ...Complex III subunit 7 / Complex III subunit VII / QP-C / Ubiquinol-cytochrome c reductase complex 14 kDa protein
Cytochromeb-c1complexsubunit8 / Complex III subunit 8 / Complex III subunit VIII / Ubiquinol-cytochrome c reductase complex 9.5 kDa ...Complex III subunit 8 / Complex III subunit VIII / Ubiquinol-cytochrome c reductase complex 9.5 kDa protein / Ubiquinol-cytochrome c reductase complex ubiquinone-binding protein QP-C
Cytochromeb-c1complexsubunit6, mitochondrial / Complex III subunit 6 / Complex III subunit VIII / Cytochrome c1 non-heme 11 kDa protein / ...Complex III subunit 6 / Complex III subunit VIII / Cytochrome c1 non-heme 11 kDa protein / Mitochondrial hinge protein / Ubiquinol-cytochrome c reductase complex 11 kDa protein
Cytochromeb-c1complexsubunit9 / Complex III subunit 9 / Complex III subunit X / Cytochrome c1 non-heme 7 kDa protein / Ubiquinol- ...Complex III subunit 9 / Complex III subunit X / Cytochrome c1 non-heme 7 kDa protein / Ubiquinol-cytochrome c reductase complex 7.2 kDa protein
Cytochromecoxidasesubunit6B1 / Cytochrome c oxidase polypeptide VII / Cytochrome c oxidase subunit AED / Cytochrome c oxidase ...Cytochrome c oxidase polypeptide VII / Cytochrome c oxidase subunit AED / Cytochrome c oxidase subunit VIb isoform 1 / COX VIb-1