Catalytically inactive phosphatase (, ). By binding to G3BP1, inhibits the formation of G3BP1-induced stress granules (, ). Does not act by protecting the dephosphorylation of G3BP1 at 'Ser-149' . Inhibits PTPMT1 phosphatase activity . By inhibiting PTPMT1, positively regulates intrinsic apoptosis . May play a role in the formation of neurites during neuronal development .
Subcellular locations: Mitochondrion matrix