Cryo-EM map of Euglena gracilis supercomplex III2+IV2, composite
マップデータ
試料
複合体: Euglena gracilis supercomplex III2+IV2
複合体: Euglena gracilis supercomplex III2+IV2
タンパク質・ペプチド: x 30種
リガンド: x 12種
キーワード
Electron transport chain / supercomplex / membrane protein / Euglena gracilis / ELECTRON TRANSPORT
機能・相同性
機能・相同性情報
: / : / cytochrome-c oxidase / quinol-cytochrome-c reductase / ubiquinol-cytochrome-c reductase activity / mitochondrial electron transport, cytochrome c to oxygen / cytochrome-c oxidase activity / mitochondrial electron transport, ubiquinol to cytochrome c / : / electron transport coupled proton transport ...: / : / cytochrome-c oxidase / quinol-cytochrome-c reductase / ubiquinol-cytochrome-c reductase activity / mitochondrial electron transport, cytochrome c to oxygen / cytochrome-c oxidase activity / mitochondrial electron transport, ubiquinol to cytochrome c / : / electron transport coupled proton transport / ATP synthesis coupled electron transport / mitochondrial inner membrane / electron transfer activity / copper ion binding / heme binding / mitochondrion / membrane / metal ion binding 類似検索 - 分子機能
Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome c oxidase subunit III-like superfamily / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome oxidase subunit II transmembrane region profile. / Cytochrome c1, transmembrane anchor, C-terminal / Cytochrome c/quinol oxidase subunit II / Cytochrome c1 / Cytochrome C1 family / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD ...Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome c oxidase subunit III-like superfamily / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome oxidase subunit II transmembrane region profile. / Cytochrome c1, transmembrane anchor, C-terminal / Cytochrome c/quinol oxidase subunit II / Cytochrome c1 / Cytochrome C1 family / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD / Cytochrome b/b6 C-terminal region profile. / Copper centre Cu(A) / CO II and nitrous oxide reductase dinuclear copper centers signature. / Cytochrome b/b6, C-terminal domain superfamily / Cytochrome C oxidase subunit II, transmembrane domain superfamily / Cytochrome b/b6/petB / Cytochrome c oxidase, subunit I, copper-binding site / Heme-copper oxidase catalytic subunit, copper B binding region signature. / Cytochrome c oxidase-like, subunit I domain / Cytochrome oxidase subunit I profile. / Cytochrome c oxidase subunit I / Cytochrome c oxidase-like, subunit I superfamily / Cytochrome C and Quinol oxidase polypeptide I / Cytochrome b/b6, N-terminal / Cytochrome b/b6-like domain superfamily / Cytochrome b/b6 N-terminal region profile. / Di-haem cytochrome, transmembrane / Cytochrome C oxidase subunit II, periplasmic domain / Cytochrome c oxidase subunit II-like C-terminal / Cytochrome oxidase subunit II copper A binding domain profile. / Peptidase M16, N-terminal / Insulinase (Peptidase family M16) / Metalloenzyme, LuxS/M16 peptidase-like / Cytochrome c-like domain superfamily / Cupredoxin 類似検索 - ドメイン・相同性
Cytochrome b / Cytochrome c1, heme protein / Ubiquinol-cytochrome-c reductase complex core protein 2, mitochondrial / Ubiquinol-cytochrome-C reductase complex subunit IX, mitochondrial / Cytochrome c oxidase subunit 1 / Putative NADH dehydrogenase subunit 6 / Cytochrome c oxidase subunit 2 類似検索 - 構成要素
ジャーナル: Nat Commun / 年: 2024 タイトル: Euglena's atypical respiratory chain adapts to the discoidal cristae and flexible metabolism. 著者: Zhaoxiang He / Mengchen Wu / Hongtao Tian / Liangdong Wang / Yiqi Hu / Fangzhu Han / Jiancang Zhou / Yong Wang / Long Zhou / 要旨: Euglena gracilis, a model organism of the eukaryotic supergroup Discoba harbouring also clinically important parasitic species, possesses diverse metabolic strategies and an atypical electron ...Euglena gracilis, a model organism of the eukaryotic supergroup Discoba harbouring also clinically important parasitic species, possesses diverse metabolic strategies and an atypical electron transport chain. While structures of the electron transport chain complexes and supercomplexes of most other eukaryotic clades have been reported, no similar structure is currently available for Discoba, limiting the understandings of its core metabolism and leaving a gap in the evolutionary tree of eukaryotic bioenergetics. Here, we report high-resolution cryo-EM structures of Euglena's respirasome I + III + IV and supercomplex III + IV. A previously unreported fatty acid synthesis domain locates on the tip of complex I's peripheral arm, providing a clear picture of its atypical subunit composition identified previously. Individual complexes are re-arranged in the respirasome to adapt to the non-uniform membrane curvature of the discoidal cristae. Furthermore, Euglena's conformationally rigid complex I is deactivated by restricting ubiquinone's access to its substrate tunnel. Our findings provide structural insights for therapeutic developments against euglenozoan parasite infections.