The mitochondrially-encoded subunits function in electron transfer, and the nuclear-encoded subunits may function in the regulation and assembly of the complex.
This nuclear gene encodes a protein similar to polypeptides 1 and 2 of subunit VIIa in the C-terminal region, and also highly similar to the mouse Sig81 protein sequence.
This gene is expressed in all tissues, and upregulated in a breast cancer cell line after estrogen treatment. It is possible that this gene represents a regulatory subunit of COX and mediates the higher level of energy production in target cells by estrogen.[6]
Schmidt TR, Doan JW, Goodman M, Grossman LI (2004). "Retention of a duplicate gene through changes in subcellular targeting: an electron transport protein homologue localizes to the golgi". J. Mol. Evol. 57 (2): 222–8. doi:10.1007/s00239-003-2468-8. PMID14562965. S2CID25021067.
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