Enables glycerol kinase activity. Acts upstream of or within glucose homeostasis; glycerol metabolic process; and regulation of fatty acid metabolic process. Located in cytosol; mitochondrion; and nucleus. Is expressed in several structures, including brain; brown fat; genitourinary system; heart; and liver. Used to study glycerol kinase deficiency. Human ortholog(s) of this gene implicated in glycerol kinase deficiency. Orthologous to human GK (glycerol kinase). [provided by Alliance of Genome Resources, Apr 2022]