Predicted to enable mannosyltransferase activity. Predicted to be involved in protein C-linked glycosylation via 2'-alpha-mannosyl-L-tryptophan. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be active in nuclear inner membrane. Is expressed in brain; lung; metanephros; and sensory organ. Orthologous to human DPY19L1 (dpy-19 like C-mannosyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]