Strogolova V, Furness A, Robb-McGrath M, Garlich J, Stuart RA

We report that Rcf1(Aim31), a member of the conserved hypoxia induced gene 1 (Hig1) protein family, represents a novel component of the yeast cytochrome bc(1)-cytochrome 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 ...

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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(Aim38), and together their presence is required for optimal COX enzyme activity and the correct assembly of the cytochrome bc(1)-COX supercomplex. Rcf1 and Rcf2 independently can 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 is 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.

Date: Feb. 06, 2012

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