Enables catechol O-methyltransferase activity. Involved in several processes, including auditory receptor cell development; catecholamine catabolic process; and positive regulation of protein import. Located in apical part of cell and endoplasmic reticulum. Used to study autosomal recessive nonsyndromic deafness 63. Human ortholog(s) of this gene implicated in autosomal recessive nonsyndromic deafness 63. Orthologous to human LRTOMT (leucine rich transmembrane and O-methyltransferase domain containing). [provided by Alliance of Genome Resources, Apr 2022]