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- W3046130577 abstract "Abstract The rhomboid protease PARL is a critical regulator of mitochondrial homeostasis through its cleavage of substrates such as PINK1, PGAM5, and Smac, which have crucial roles in mitochondrial quality control and apoptosis. To gain insight into the catalytic properties of the PARL protease, we expressed human PARL in yeast and used FRET-based kinetic assays to measure proteolytic activity in vitro . We show PARL activity in detergent is enhanced by cardiolipin. Significantly higher turnover rates are observed for PARL reconstituted in proteoliposomes, with Smac being cleaved most rapidly at a rate of 1 min −1 . PGAM5 is cleaved with the highest efficiency compared to PINK1 and Smac. In proteoliposomes, a truncated β-cleavage form of PARL is more active than the full-length enzyme for hydrolysis of PINK1, PGAM5 and Smac. Multiplex substrate profiling reveals a substrate preference for PARL with a bulky side chain Phe in P1, which is distinct from small side chain residues typically found with bacterial rhomboid proteases. This study using recombinant PARL provides fundamental insights into its catalytic activity and substrate preferences." @default.
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- W3046130577 date "2020-07-29" @default.
- W3046130577 modified "2023-09-26" @default.
- W3046130577 title "Insights into the catalytic properties of the mitochondrial rhomboid protease PARL" @default.
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- W3046130577 doi "https://doi.org/10.1101/2020.07.27.224220" @default.
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