Allotopic expression of COX6 elucidates Atco-driven co-assembly of cytochrome oxidase and ATP synthase

Autor(es)

Franco, Leticia Veloso R. ; Su, Chen-Hsien ; Teixeira, Lorisa Simas ; Chagas, Jhulia Almeida Clarck ; Barros, Mario Henrique ; Tzagoloff, Alexander

• Tipo de documento: Artigo Científico
• Fonte: LIFE SCIENCE ALLIANCE; v. 6, n. 11, p. 15-pg., 2023-11-01.

Resumo

The Cox6 subunit of Saccharomyces cerevisiae cytochrome oxidase (COX) and the Atp9 subunit of the ATP synthase are encoded in nuclear and mitochondrial DNA, respectively. The two proteins interact to form Atco complexes that serve as the source of Atp9 for ATP synthase assembly. To determine if Atco is also a precursor of COX, we pulse-labeled Cox6 in isolated mitochondria of a cox6 nuclear mutant with COX6 in mitochondrial DNA. Only a small fraction of the newly translated Cox6 was found to be present in Atco, which can explain the low concentration of COX and poor complementation of the cox6 mutation by the allotopic gene. This and other pieces of evidence presented in this study indicate that Atco is an obligatory source of Cox6 for COX biogenesis. Together with our finding that atp9 mutants fail to assemble COX, we propose a regulatory model in which Atco unidirectionally couples the biogenesis of COX to that of the ATP synthase to maintain a proper ratio of these two complexes of oxidative phosphorylation. (AU)

• Processo FAPESP: 19/16015-3 - ATCO1, um regulador central da biogênese de ATP Sintase e Citocromo Oxidase nas mitocôndrias?
• Beneficiário: Leticia Veloso Ribeiro Franco
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 19/02799-2 - ATCO1, um regulador central da biogênese de ATP sintase e citocromo oxidase nas mitocôndrias?
• Beneficiário: Leticia Veloso Ribeiro Franco
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 20/05812-7 - Eventos regulatórios na biogênese do mitorribossomo e dos complexos respiratórios
• Beneficiário: Mario Henrique de Barros
• Modalidade de apoio: Auxílio à Pesquisa - Regular