Has a role in cell separation where it is required for the degradation of the cell wall material surrounding the septum (the septum edging) which must be hydrolyzed before full separation of the daughter cells can occur. Hydrolyzes 1,3-alpha-glucan predominantly into pentasaccharides. Endohydrolysis of (1->3)-alpha-D-glucosidic linkages in isolichenin, pseudonigeran and nigeran. Monomer. Associates with the cell wall. Not glycosylated. Belongs to the glycosyl hydrolase 71 family.