CYCS (Cytochrome C, Somatic) is a Protein Coding gene. Diseases associated with CYCS include Thrombocytopenia 4 and Autosomal Thrombocytopenia With Normal Platelets. Among its related pathways are Apoptotic Pathways in Synovial Fibroblasts and Apoptosis Modulation and Signaling. Gene Ontology (GO) annotations related to this gene include iron ion binding and electron transfer activity.
Electron carrier protein. The oxidized form of the cytochrome c heme group can accept an electron from the heme group of the cytochrome c1 subunit of cytochrome reductase. Cytochrome c then transfers this electron to the cytochrome oxidase complex, the final protein carrier in the mitochondrial electron-transport chain.
Plays a role in apoptosis. Suppression of the anti-apoptotic members or activation of the pro-apoptotic members of the Bcl-2 family leads to altered mitochondrial membrane permeability resulting in release of cytochrome c into the cytosol. Binding of cytochrome c to Apaf-1 triggers the activation of caspase-9, which then accelerates apoptosis by activating other caspases.
Biological Process
Activation of cysteine-type endopeptidase activity involved in apoptotic process by cytochrome c Source: UniProtKB Apoptotic process Source: UniProtKB-KW Cellular respiration Source: UniProtKB Cellular response to oxidative stress Source: Reactome Mitochondrial electron transport, cytochrome c to oxygen Source: GO_Central Mitochondrial electron transport, ubiquinol to cytochrome c Source: GO_Central Mitochondrion organization Source: Reactome Positive regulation of cysteine-type endopeptidase activity involved in apoptotic process Source: GO_Central
Cellular Location
Mitochondrion intermembrane space. Loosely associated with the inner membrane.
Involvement in disease
Thrombocytopenia 4 (THC4): A form of thrombocytopenia, a hematologic disorder defined by a decrease in the number of platelets in circulating blood, resulting in the potential for increased bleeding and decreased ability for clotting.
PTM
Binds 1 heme group per subunit. Phosphorylation at Tyr-49 and Tyr-98 both reduce by half the turnover in the reaction with cytochrome c oxidase, down-regulating mitochondrial respiration.
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Datasheet