Is predicted to encode a protein with the following domains: WD domain, G-beta repeat; G-protein beta WD-40 repeat; WD40 repeat; WD40/YVTN repeat-like-containing domain superfamily; and WD40-repeat-containing domain superfamily. Is an ortholog of C. elegans bub-3. In C. elegans, bub-3 is involved in Bub1-Bub3 complex localization to kinetochore; embryo development; and negative regulation of metaphase/anaphase transition of cell cycle.