Microtubule-stabilizing protein that may be involved in the regulation of microtubule dynamics and cytoskeletal organization. May act as a regulator of RAC1 activity through interaction with ARHGEF2 to control lamellipodial formation and cell mobility. Does not seem to have protease activity as it has lost the active site residues. Interacts (via domain III) with microtubules. Interacts (via domain II) with ARHGEF2 (via the N-terminal zinc finger). At 10.5 dpc expressed in the mandibular arches, heart and limb buds. Up-regulated during the osteoclasogenic process. Inhibited by dexamethaxone during the osteoclasogenic process. Belongs to the peptidase C2 family.