Required for the proteolytic cleavage of the transcription factor pacc-1 in response to alkaline ambient pH. May act as a scaffold protein that recruits the calpain-like protease palB/cpr-8 via snf7/vps-3 to its substrate pacc-1 (By similarity). Interacts with pacc-1 by binding to its two YPX[LI] motifs. Belongs to the palA/RIM20 family.