Tyrosine-protein kinase receptor for Wnt ligands egl-20, mom-2 and cwn-1 (PubMed:17942487, PubMed:25029443). Involved in the final positioning of migrating ALM, CAN, BDU and HSN neurons during development (PubMed:10476968, PubMed:9165130, PubMed:9475729, PubMed:14651925). Involved in the anterior-posterior migration of QR neuroblast descendants, QR.p and QR.pa, by maintaining QR.p cell polarization, probably through mig-2 (PubMed:25373777). In addition, plays a role in ASI sensory neuron positioning and functions (PubMed:10556063). Regulates asymmetric division of V cells (seam cells) and CA/CP neuroblast, and axon outgrowth (PubMed:10476968, PubMed:14651925). Probably by acting as a receptor for Wnt ligand cwn-2, plays a role in the positioning of the nerve ring by controlling axon guidance of SIA and SIB neurons (PubMed:19855022). Involved in synapse plasticity by regulating delivery and/or stabilization of acetylcholine receptor acr-16 at post-synaptic membrane sites and the distribution of synaptic vesicles at pre-synaptic release sites (PubMed:15944127). Probably by acting as a receptor for Wnt ligands cwn-1 and cwn-2, negatively regulates developmental neurite pruning of AIM neurons (PubMed:19561603). Plays a role in ALM neuron polarity (PubMed:25917219). By binding Wnt ligands mom-2, cwn-1 and egl-20 and thereby restricting their availability, negatively regulates Wnt signaling. This mechanism is involved in HSN neuron and QR neuronal descendent migration, and in vulva development (PubMed:15371357, PubMed:17942487). Involved in dauer formation, locomotion, tail morphology and egg-laying (PubMed:10556063, PubMed:9475729, PubMed:14504222). May be involved in distal tip cell (DTC) migration during the development of the posterior gonad (PubMed:10556063). Involved in the positioning of the nerve ring. Involved in the positioning of the nerve ring. ATP + L-tyrosyl-[protein] = ADP + H(+) + O-phospho-L-tyrosyl-[protein] Can use both Mg(2+) and Mn(2+) in vitro and shows higher activity with Mn(2+) but Mg(2+) is likely to be the in vivo cofactor. Autophosphorylation gives similar KM values for ATP. Localizes in punctate structures along neuronal processes where it partially colocalizes with synaptic vesicle marker snb-1 (PubMed:15944127). Localizes in punctate structures in the axons forming the nerve ring and in proximal AIM neurites destined for elimination (PubMed:19561603). Enriched at the distal tips of muscle arms where they interact with ventral nerve cord (PubMed:15944127). Expressed in AIM neurons and in several head neurons (PubMed:19561603). Isoform a is expressed in some head muscles and in several head neurons. Isoform b is expressed in several head neurons, in procorpus and isthmus pharyngeal muscles, body wall muscles, and to a lower extent in intestine, seam cells (V cells) and distal tip cells (PubMed:10556063, PubMed:10476968, PubMed:15944127). Expressed in 200-cell stage embryo (PubMed:10476968). Expressed predominantly in QR neuroblast descendants and to a lesser extent in QL neuroblast descendants during larval stage (PubMed:25373777). The FZ domain is involved in binding to Wnt ligands egl-20, cwn-1 and mom-2 (PubMed:15371357, PubMed:17942487). The domain is required for the final positioning of migrating ALM, CAN, BDU and HSN neurons, and maybe QR neuroblast descendants during development and for neurite pruning of AIM neurons (PubMed:14651925, PubMed:19561603). Required for the establishment of ALM polarity (PubMed:25917219). The domain is required to establish correct polarity in ALM neurons (PubMed:25917219). May play a role in QR neuroblast descendant migration (PubMed:25373777). The kinase domain is dispensable for ALM, CAN, BDU and HSN neuron migration, V cell asymmetric division, acr-16 localization, for the positioning of the nerve ring and probably for the negative regulation of neurite pruning of AIM neurons (PubMed:14651925, PubMed:15944127, PubMed:19855022, PubMed:19561603). The cytoplasmic domain is required for the negative regulation of neurite pruning of AIM neurons. Autophosphorylated at tyrosine residues which are probably located in the activation loop (residues 724-732). Autophosphorylation does not increase kinase activity in vitro. RNAi-mediated knockdown in a lin-17 n671 mutant background causes 8 percent of animals to produce more than 22 vulval cells (overinduction). Belongs to the protein kinase superfamily. Tyr protein kinase family. ROR subfamily.