GTP-binding protein involved in termination of M phase. May play a role in triggering the degradation of G2 cyclin to inactivate M-phase promoting factor at the termination of mitosis. Acts upstream of CDC15 kinase and may be required to activate the CDC15 protein kinase pathway. Interacts with CDC15 and AMN1. AMN1 and CDC15 compete for association with TEM1. Present with 573 molecules/cell in log phase SD medium.