Acts upstream of or within negative regulation of cell population proliferation; negative regulation of mitotic nuclear division; and traversing start control point of mitotic cell cycle. Located in kinetochore. Is expressed in cerebellum; midbrain ventricular layer; olfactory cortex ventricular layer; and telencephalon ventricular layer. Orthologous to human MTBP (MDM2 binding protein). [provided by Alliance of Genome Resources, Apr 2022]