Rcf1 and Rcf2, members of the hypoxia-induced gene 1 protein family, are critical components of the mitochondrial cytochrome bc1-cytochrome c oxidase supercomplex. Mol Cell Biol 2012 Apr;32(8):1363-73
Date
02/09/2012Pubmed ID
22310663Pubmed Central ID
PMC3318584DOI
10.1128/MCB.06369-11Scopus ID
2-s2.0-84861320506 (requires institutional sign-in at Scopus site) 158 CitationsAbstract
We report that Rcf1 (formerly Aim31), a member of the conserved hypoxia-induced gene 1 (Hig1) protein family, represents a novel component of the yeast cytochrome bc(1)-cytochrome c oxidase (COX) supercomplex. Rcf1 (respiratory supercomplex factor 1) partitions with the COX complex, and evidence that it may act as a bridge to the cytochrome bc(1) complex is presented. Rcf1 interacts with the Cox3 subunit and can do so prior to their assembly into the COX complex. A close proximity of Rcf1 and members of the ADP/ATP carrier (AAC) family was also established. Rcf1 displays overlapping function with another Hig1-related protein, Rcf2 (formerly Aim38), and their joint presence is required for optimal COX enzyme activity and the correct assembly of the cytochrome bc(1)-COX supercomplex. Rcf1 and Rcf2 can independently associate with the cytochrome bc(1)-COX supercomplex, indicating that at least two forms of this supercomplex exist within mitochondria. We provide evidence that the association with the cytochrome bc(1)-COX supercomplex and regulation of the COX complex are a conserved feature of Hig1 family members. Based on our findings, we propose a model where the Hig1 proteins regulate the COX enzyme activity through Cox3 and associated Cox12 protein, in a manner that may be influenced by the neighboring AAC proteins.
Author List
Strogolova V, Furness A, Robb-McGrath M, Garlich J, Stuart RAAuthor
Rosemary Stuart PhD Professor in the Biology department at Marquette UniversityMESH terms used to index this publication - Major topics in bold
Electron Transport Complex IIIElectron Transport Complex IV
Enzyme Activation
Hypoxia-Inducible Factor 1
Mitochondria
Models, Biological
Protein Binding
Saccharomyces cerevisiae
Saccharomyces cerevisiae Proteins