Enables protein kinase binding activity and protein tyrosine kinase activity. Involved in several processes, including positive regulation of macromolecule metabolic process; positive regulation of synaptic transmission; and sensory organ development. Located in cell projection; external side of plasma membrane; and neuromuscular junction. Human ortholog(s) of this gene implicated in congenital myasthenic syndrome 9 and fetal akinesia deformation sequence syndrome 1. Orthologous to human MUSK (muscle associated receptor tyrosine kinase). [provided by Alliance of Genome Resources, Apr 2022]