Required for the proteolytic cleavage of the transcriptional repressor RIM101 in response to alkaline ambient pH, which is necessary for sporulation and invasive growth. Probably the protease that cleaves RIM101. Interacts with SNF7, which may act together with RIM20 as a scaffold to recruit RIM13 to its substrate RIM101. Present with 432 molecules/cell in log phase SD medium. Belongs to the peptidase C2 family. PalB/RIM13 subfamily.