Is predicted to encode a protein with the following domains: Anaphase-promoting complex, cyclosome, subunit 3; Tetratricopeptide repeat; and Tetratricopeptide-like helical domain superfamily. Is an ortholog of C. elegans mat-1. In C. elegans, mat-1 is involved in asymmetric cell division; cortical granule exocytosis; and polarity specification of anterior/posterior axis.