Enables phosphomevalonate kinase activity. Predicted to be involved in cholesterol biosynthetic process and isopentenyl diphosphate biosynthetic process, mevalonate pathway. Predicted to act upstream of or within cholesterol metabolic process; phosphorylation; and steroid biosynthetic process. Predicted to be located in cytosol. Is expressed in early conceptus. Human ortholog(s) of this gene implicated in porokeratosis. Orthologous to human PMVK (phosphomevalonate kinase). [provided by Alliance of Genome Resources, Apr 2022]