Catalytic activity:ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. ,Domain:The WW-binding motifs mediate interaction with WWOX. ,Function:Specifically binds and is activated by neuregulins , NRG-2 , NRG-3 , heparin-binding EGF-like growth factor , betacellulin and NTAK. Interaction with these factors induces cell differentiation. Not activated by EGF , TGF-A , and amphiregulin. ,PTM:Isoform JM-A is processed but not isoform JM-B. So , they respectively represent cleavable and non-cleavable forms of the receptor. ,PTM:Ligand-binding increases phosphorylation on tyrosine residues. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. EGF receptor subfamily. ,similarity:Contains 1 protein kinase domain. ,subunit:Homodimer or heterodimer with each of the other ERBB receptors (Potential) . Interacts with PDZ domains of DLG2 , DLG3 , DLG4 and the syntrophin SNTB2. Interacts with CBFA2T3 , MUC1 and WWOX. ,tissue specificity:Expressed at highest levels in brain , heart , kidney , in addition to skeletal muscle , parathyroid , cerebellum , pituitary , spleen , testis and breast. Lower levels in thymus , lung , salivary gland , and pancreas. Isoform JM-A and isoform JM-B are expressed in cerebellum , but only the isoform JM-B is expressed in the heart. ,
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