TP53 Regulates Metabolic Genes / Cytoprotection by HMOX1 / respiratory chain complex IV assembly / mitochondrial respirasome assembly / respiratory chain complex IV / mitochondrial respiratory chain complex IV / regulation of oxidative phosphorylation / Respiratory electron transport / cytochrome-c oxidase / mitochondrial respirasome ...TP53 Regulates Metabolic Genes / Cytoprotection by HMOX1 / respiratory chain complex IV assembly / mitochondrial respirasome assembly / respiratory chain complex IV / mitochondrial respiratory chain complex IV / regulation of oxidative phosphorylation / Respiratory electron transport / cytochrome-c oxidase / mitochondrial respirasome / oxidative phosphorylation / mitochondrial electron transport, cytochrome c to oxygen / cytochrome-c oxidase activity / Mitochondrial protein degradation / electron transport coupled proton transport / ATP synthesis coupled electron transport / enzyme regulator activity / central nervous system development / mitochondrial inner membrane / oxidoreductase activity / copper ion binding / heme binding / mitochondrion / metal ion binding Similarity search - Function
Cytochrome c oxidase subunit VIIa, metazoa / Cytochrome C oxidase, subunit VIIB / Cytochrome c oxidase subunit IV / Cytochrome C oxidase, subunit VIIB domain superfamily / Mitochondrial cytochrome c oxidase subunit VIc/VIIs / Cytochrome c oxidase, subunit VIIa superfamily / Mitochondrial cytochrome c oxidase subunit VIc/VIIs superfamily / Cytochrome c oxidase subunit VIc / Cytochrome C oxidase chain VIIB / : ...Cytochrome c oxidase subunit VIIa, metazoa / Cytochrome C oxidase, subunit VIIB / Cytochrome c oxidase subunit IV / Cytochrome C oxidase, subunit VIIB domain superfamily / Mitochondrial cytochrome c oxidase subunit VIc/VIIs / Cytochrome c oxidase, subunit VIIa superfamily / Mitochondrial cytochrome c oxidase subunit VIc/VIIs superfamily / Cytochrome c oxidase subunit VIc / Cytochrome C oxidase chain VIIB / : / Cytochrome c oxidase, subunit VIa, conserved site / Cytochrome c oxidase subunit VIa signature. / Cytochrome c oxidase subunit VIIc / Cytochrome c oxidase subunit IV family / 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 VIa / Cytochrome c oxidase, subunit Va/VI / Cytochrome c oxidase, subunit VIa superfamily / Cytochrome c oxidase, subunit Va/VI superfamily / Cytochrome c oxidase subunit VIa / Cytochrome c oxidase subunit Va / Cytochrome c oxidase, subunit VIb / Cytochrome c oxidase, subunit VIb superfamily / Cytochrome oxidase c subunit VIb / Cytochrome c oxidase subunit VII / Cytochrome c oxidase subunit VII / Cytochrome c oxidase subunit 2, C-terminal / Cytochrome c oxidase subunit III domain / Cytochrome c oxidase subunit Vb, zinc binding region signature. / Cytochrome c oxidase, subunit Vb / Cytochrome c oxidase, subunit Vb superfamily / Cytochrome c oxidase subunit Vb / Cytochrome c oxidase subunit Vb, zinc binding domain profile. / Cytochrome c oxidase subunit I domain / Cytochrome c oxidase, subunit II / Cytochrome C oxidase subunit II, transmembrane domain / 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 oxidase subunit II, transmembrane domain / Cytochrome oxidase subunit II transmembrane region profile. / 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 I / Cytochrome c oxidase-like, subunit I superfamily / Cytochrome C and Quinol oxidase polypeptide I / Cytochrome C oxidase subunit II, periplasmic domain / 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 (cattle) / cattle (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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