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CG7630 is the Drosophila melanogaster homolog of the cytochrome c oxidase subunit COX7B
Author(s) -
Brischigliaro Michele,
CabreraOrefice Alfredo,
Sturlese Mattia,
Elurbe Dei M,
Frigo Elena,
FernandezVizarra Erika,
Moro Stefano,
Huynen Martijn A,
Arnold Susanne,
Viscomi Carlo,
Zeviani Massimo
Publication year - 2022
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.15252/embr.202254825
Subject(s) - drosophila melanogaster , protein subunit , cytochrome c oxidase , biology , genetics , drosophila (subgenus) , oxidase test , biochemistry , gene , enzyme , mitochondrion
The mitochondrial respiratory chain (MRC) is composed of four multiheteromeric enzyme complexes. According to the endosymbiotic origin of mitochondria, eukaryotic MRC derives from ancestral proteobacterial respiratory structures consisting of a minimal set of complexes formed by a few subunits associated with redox prosthetic groups. These enzymes, which are the “core” redox centers of respiration, acquired additional subunits, and increased their complexity throughout evolution. Cytochrome c oxidase (COX), the terminal component of MRC, has a highly interspecific heterogeneous composition. Mammalian COX consists of 14 different polypeptides, of which COX7B is considered the evolutionarily youngest subunit. We applied proteomic, biochemical, and genetic approaches to investigate the COX composition in the invertebrate model Drosophila melanogaster . We identified and characterized a novel subunit which is widely different in amino acid sequence, but similar in secondary and tertiary structures to COX7B, and provided evidence that this object is in fact replacing the latter subunit in virtually all protostome invertebrates. These results demonstrate that although individual structures may differ the composition of COX is functionally conserved between vertebrate and invertebrate species.