Mdv1 is a component of the mitochondrial fission machinery in Saccharomyces cerevisiae. The protein is also involved in peroxisome proliferation. Mdv1 along with Fis1 is also involved in controlling Dnm-1 dependant devision, a GTPase involved in the mediation of mitochondrial division. In this role, Mdv1 is the linker between Fis1 and Dnm1. Mdv1 plays a key role in the regulation of Dnm1 self-assembly.