Cytochrome c oxidase (COX), the terminal enzyme of the mitochondrial respiratory chain, catalyzes the electron transfer from reduced cytochrome c to oxygen. It is a heteromeric complex consisting of 3 catalytic subunits encoded by mitochondrial genes and multiple structural subunits encoded by nuclear genes. The mitochondrially-encoded subunits function in electron transfer, and the nuclear-encoded subunits may be involved in the regulation and assembly of the complex. This nuclear gene encodes isoform 2 of subunit IV. Isoform 1 of subunit IV is encoded by a different gene, however, the two genes show a similar structural organization. Subunit IV is the largest nuclear encoded subunit which plays a pivotal role in COX regulation.
COX4I2; cytochrome c oxidase subunit IV isoform 2 (lung); COX4L2, cytochrome c oxidase subunit IV isoform 2; cytochrome c oxidase subunit 4 isoform 2, mitochondrial; COX4 2; COX4B; COXIV 2; cytochrome c oxidase subunit IV like 2; dJ857M17.2; COX IV-2; cy; cytochrome c oxidase subunit IV isoform 2; zgc:73355; Cox4-2