Enables histone binding activity and histone methyltransferase activity (H4-K20 specific). Involved in positive regulation of isotype switching. Acts upstream of or within histone H4-K20 trimethylation. Located in condensed chromosome, centromeric region. Is expressed in several structures, including adrenal gland; alimentary system; nervous system; sensory organ; and urinary system. Orthologous to human KMT5C (lysine methyltransferase 5C). [provided by Alliance of Genome Resources, Apr 2022]