Add time:07/11/2019 Source:sciencedirect.com
The [Fe-S] late-acting subsystem comprised of Isa1p/Isa2p, Grx5p, and Iba57p proteins (Fe–S-IBG subsystem) is involved in [4Fe-4S]-cluster protein assembly. The effect of deleting IBA57 in Saccharomyces cerevisiae on mitochondrial respiratory complex integration and functionality associated with Rieske protein maturation was evaluated. The iba57Δ mutant showed decreased expression and maturation of the Rieske protein. The loss of Rieske protein caused by IBA57 deletion affected the structure of supercomplexes III2IV2 and III2IV1 and their integration into the mitochondria, causing dysfunction in the electron transport chain. These effects were correlated with decreased cytochrome functionality and content in the iba57Δ mutant. These findings suggest that Iba57p participates in maturation of the [2Fe–2S]-cluster into the Rieske protein and that Rieske protein plays important roles in the conformation and functionality of mitochondrial supercomplex III/IV in the electron transport chain.
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