mitochondrial electron transport chain / inhibitor / complex IV / MEMBRANE PROTEIN
Function / homology
Function and homology information
Complex IV assembly / TP53 Regulates Metabolic Genes / Cytoprotection by HMOX1 / respiratory chain complex IV assembly / mitochondrial respirasome assembly / Respiratory electron transport / respiratory chain complex IV / respiratory chain complex / cytochrome-c oxidase / oxidative phosphorylation ...Complex IV assembly / TP53 Regulates Metabolic Genes / Cytoprotection by HMOX1 / respiratory chain complex IV assembly / mitochondrial respirasome assembly / Respiratory electron transport / respiratory chain complex IV / respiratory chain complex / cytochrome-c oxidase / oxidative phosphorylation / mitochondrial electron transport, cytochrome c to oxygen / cytochrome-c oxidase activity / Mitochondrial protein degradation / ATP synthesis coupled electron transport / enzyme regulator activity / aerobic respiration / central nervous system development / respiratory electron transport chain / mitochondrial inner membrane / oxidoreductase activity / copper ion binding / heme binding / mitochondrion / metal ion binding Similarity search - Function
Mitochondrial cytochrome c oxidase subunit VIc/VIIs / Mitochondrial cytochrome c oxidase subunit VIc/VIIs superfamily / : / Cytochrome c oxidase subunit VIc / Cytochrome c oxidase subunit VIIa, metazoa / Cytochrome C oxidase, subunit VIIB / Cytochrome c oxidase subunit IV / Cytochrome C oxidase, subunit VIIB domain superfamily / Cytochrome c oxidase, subunit VIIa superfamily / Cytochrome C oxidase chain VIIB ...Mitochondrial cytochrome c oxidase subunit VIc/VIIs / Mitochondrial cytochrome c oxidase subunit VIc/VIIs superfamily / : / Cytochrome c oxidase subunit VIc / Cytochrome c oxidase subunit VIIa, metazoa / Cytochrome C oxidase, subunit VIIB / Cytochrome c oxidase subunit IV / Cytochrome C oxidase, subunit VIIB domain superfamily / Cytochrome c oxidase, subunit VIIa superfamily / Cytochrome C oxidase chain VIIB / Cytochrome c oxidase, subunit VIa, conserved site / Cytochrome c oxidase subunit VIa signature. / Cytochrome c oxidase, subunit VIa / Cytochrome c oxidase, subunit VIa superfamily / Cytochrome c oxidase subunit VIa / Cytochrome c oxidase, subunit VIb / : / Cytochrome c oxidase subunit Vb, zinc binding region signature. / Cytochrome c oxidase subunit VIIc / Cytochrome c oxidase subunit IV family / Cytochrome c oxidase, subunit VIb superfamily / Cytochrome c oxidase subunit VIIc superfamily / Cytochrome c oxidase subunit IV superfamily / Cytochrome c oxidase subunit VIIc / Cytochrome c oxidase subunit IV / Cytochrome c oxidase subunit 2, C-terminal / Cytochrome oxidase c subunit VIb / Cytochrome c oxidase, subunit Va/VI / Cytochrome c oxidase, subunit Va/VI superfamily / Cytochrome c oxidase subunit Va / Cytochrome c oxidase subunit VII / Cytochrome c oxidase subunit VII / Cytochrome c oxidase, subunit Vb / Cytochrome c oxidase subunit III domain / Cytochrome c oxidase subunit Vb / Cytochrome c oxidase subunit Vb, zinc binding domain profile. / Cytochrome c oxidase, subunit II / Cytochrome c oxidase, subunit Vb superfamily / Cytochrome c oxidase subunit I domain / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome oxidase subunit II transmembrane region profile. / Cytochrome c oxidase subunit III / Cytochrome c oxidase subunit III-like / Cytochrome c oxidase, subunit III, 4-helical bundle / Cytochrome c oxidase subunit III / Heme-copper oxidase subunit III family profile. / Cytochrome c oxidase subunit III-like superfamily / Cytochrome c/quinol oxidase subunit II / Copper centre Cu(A) / CO II and nitrous oxide reductase dinuclear copper centers signature. / Cytochrome C oxidase subunit II, transmembrane domain superfamily / 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 II, periplasmic domain / Cytochrome c oxidase subunit I / Cytochrome c oxidase-like, subunit I superfamily / Cytochrome C and Quinol oxidase polypeptide I / Cytochrome c oxidase subunit II-like C-terminal / Cytochrome oxidase subunit II copper A binding domain profile. / Coiled coil-helix-coiled coil-helix (CHCH) domain profile. / Cupredoxin Similarity search - Domain/homology
Cytochrome c oxidase subunit 1 / Cytochrome c oxidase subunit 3 / Cytochrome c oxidase subunit 4 isoform 1, mitochondrial / Cytochrome c oxidase subunit 5A, mitochondrial / Cytochrome c oxidase subunit 5B, mitochondrial / Cytochrome c oxidase subunit 6B1 / Cytochrome c oxidase subunit 7C, mitochondrial / Cytochrome c oxidase subunit 6C / Cytochrome c oxidase subunit 7A1, mitochondrial / Cytochrome c oxidase subunit 6A2, mitochondrial ...Cytochrome c oxidase subunit 1 / Cytochrome c oxidase subunit 3 / Cytochrome c oxidase subunit 4 isoform 1, mitochondrial / Cytochrome c oxidase subunit 5A, mitochondrial / Cytochrome c oxidase subunit 5B, mitochondrial / Cytochrome c oxidase subunit 6B1 / Cytochrome c oxidase subunit 7C, mitochondrial / Cytochrome c oxidase subunit 6C / Cytochrome c oxidase subunit 7A1, mitochondrial / Cytochrome c oxidase subunit 6A2, mitochondrial / Cytochrome c oxidase subunit 7B, mitochondrial / Cytochrome c oxidase subunit 2 Similarity search - Component
Biological species
Bos taurus (domestic cattle)
Method
single particle reconstruction / cryo EM / Resolution: 3.1 Å
Journal: Proc Natl Acad Sci U S A / Year: 2022 Title: Structural basis of mammalian complex IV inhibition by steroids. Authors: Justin M Di Trani / Agnes Moe / Daniel Riepl / Patricia Saura / Ville R I Kaila / Peter Brzezinski / John L Rubinstein / Abstract: The mitochondrial electron transport chain maintains the proton motive force that powers adenosine triphosphate (ATP) synthesis. The energy for this process comes from oxidation of reduced ...The mitochondrial electron transport chain maintains the proton motive force that powers adenosine triphosphate (ATP) synthesis. The energy for this process comes from oxidation of reduced nicotinamide adenine dinucleotide (NADH) and succinate, with the electrons from this oxidation passed via intermediate carriers to oxygen. Complex IV (CIV), the terminal oxidase, transfers electrons from the intermediate electron carrier cytochrome to oxygen, contributing to the proton motive force in the process. Within CIV, protons move through the K and D pathways during turnover. The former is responsible for transferring two protons to the enzyme's catalytic site upon its reduction, where they eventually combine with oxygen and electrons to form water. CIV is the main site for respiratory regulation, and although previous studies showed that steroid binding can regulate CIV activity, little is known about how this regulation occurs. Here, we characterize the interaction between CIV and steroids using a combination of kinetic experiments, structure determination, and molecular simulations. We show that molecules with a sterol moiety, such as glyco-diosgenin and cholesteryl hemisuccinate, reversibly inhibit CIV. Flash photolysis experiments probing the rapid equilibration of electrons within CIV demonstrate that binding of these molecules inhibits proton uptake through the K pathway. Single particle cryogenic electron microscopy (cryo-EM) of CIV with glyco-diosgenin reveals a previously undescribed steroid binding site adjacent to the K pathway, and molecular simulations suggest that the steroid binding modulates the conformational dynamics of key residues and proton transfer kinetics within this pathway. The binding pose of the sterol group sheds light on possible structural gating mechanisms in the CIV catalytic cycle.
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