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Cytochrome c belongs to class I of the c-type cytochrome family [13] and contains a characteristic CXXCH (cysteine-any-any-cysteine-histidine) amino acid motif that binds heme. [14] This motif is located towards the N-terminus of the peptide chain and contains a histidine as the 5th ligand of the heme iron.
The CXXCH heme binding motif in cytochrome c proteins. Amino acid side chains are shown in white and heme is colored black. Cytochromes c (cyt c, c-type cytochromes) cytochromes, or heme-containing proteins, that have heme C covalently attached to the peptide backbone via one or two thioether bonds. [1]
The enzyme cytochrome c oxidase or Complex IV (was EC 1.9.3.1, now reclassified as a translocase EC 7.1.1.9) is a large transmembrane protein complex found in bacteria, archaea, and the mitochondria of eukaryotes.
The redox potential for cytochrome c can also be "fine-tuned" by small changes in protein structure and solvent interaction. [4] The number of heme C units bound to a holoprotein is highly variable. For vertebrate cells one heme C per protein is the rule but for bacteria this number is often 2, 4, 5, 6 or even 16 heme C groups per holoprotein.
Cytochrome c peroxidase, or CCP, ... The yeast enzyme is a monomer of molecular weight 34,000, containing 293 amino acids, ...
Complex III itself is composed of several subunits, one of which is a b-type cytochrome while another one is a c-type cytochrome. Both domains are involved in electron transfer within the complex. Complex IV contains a cytochrome a/a3-domain that transfers electrons and catalyzes the reaction of oxygen to water.
Cytochrome c oxidase I (COX1) also known as mitochondrially encoded cytochrome c oxidase I ... The gene product is a 57 kDa protein composed of 513 amino acids.
COX8A is a 7.6 kDa protein composed of 69 amino acids. [7] [8] This gene encodes the nuclear-encoded subunit 8A of the human mitochondrial respiratory chain enzyme complex cytochrome c oxidase. The complex consists of 13 mitochondrial- and nuclear-encoded subunits. [5]