Is predicted to encode a protein with the following domains: G-protein beta WD-40 repeat; WD40/YVTN repeat-like-containing domain superfamily; WD40 repeat; WD domain, G-beta repeat; and WD40-repeat-containing domain superfamily. Is an ortholog of C. elegans bub-3. In C. elegans, bub-3 is involved in embryo development; meiotic spindle assembly checkpoint signaling; and mitotic spindle assembly checkpoint signaling.