COX16 Promotes COX2 Metallation and Assembly During Respiratory Complex IV Biogenesis

Overview

Journal Elife

Specialty Biology

Date 2018 Jan 31

PMID 29381136

Citations 28

Authors

Abhishek Aich

Cong Wang

Arpita Chowdhury

Christin Ronsor

David Pacheu-Grau

Ricarda Richter-Dennerlein

Sven Dennerlein

Peter Rehling

Affiliations

Soon will be listed here.

Abstract

Cytochrome oxidase of the mitochondrial oxidative phosphorylation system reduces molecular oxygen with redox equivalent-derived electrons. The conserved mitochondrial-encoded COX1- and COX2-subunits are the heme- and copper-center containing core subunits that catalyze water formation. COX1 and COX2 initially follow independent biogenesis pathways creating assembly modules with subunit-specific, chaperone-like assembly factors that assist in redox centers formation. Here, we find that COX16, a protein required for cytochrome oxidase assembly, interacts specifically with newly synthesized COX2 and its copper center-forming metallochaperones SCO1, SCO2, and COA6. The recruitment of SCO1 to the COX2-module is COX16- dependent and patient-mimicking mutations in SCO1 affect interaction with COX16. These findings implicate COX16 in Cu-site formation. Surprisingly, COX16 is also found in COX1-containing assembly intermediates and COX2 recruitment to COX1. We conclude that COX16 participates in merging the COX1 and COX2 assembly lines.

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