Proteolysis of mitochondrial calpain-13 in cerebral ischemia-reperfusion injury.

ABSTRACT: Calpains are calcium-dependent cysteine proteases activated by intracellular Ca²⁺. Although calpains mainly exist in the cytosol, calpain-13 is present in the mitochondria in mouse brains; however, the enzymatic properties and physiological functions of calpain-13 remain unknown. Hence, in this study, we predicted and evaluated the enzymatic properties of calpain-13. Based on our bioinformatic approaches, calpain-13 possessed a catalytic triad and EF-hand domain, similar to calpain-1, a well-studied calpain. Therefore, we hypothesized that calpain-13 had calpain-1-like enzymatic properties; however, calpain-13 was not proteolyzed in C57BL/6J mouse brains. Subsequently, cerebral ischemia/reperfusion (I/R) injury caused proteolysis of mitochondrial calpain-13. Thus, our study show

SUBMITTER: Chukai Y 

PROVIDER: S-EPMC11267081 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature