Alternative products:Additional isoforms seem to exist ,Catalytic activity:ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. ,Function:Receptor for brain-derived neurotrophic factor (BDNF) , neurotrophin-3 and neurotrophin-4/5 but not nerve growth factor (NGF) . Involved in the development and/or maintenance of the nervous system. This is a tyrosine-protein kinase receptor. Known substrates for the TRK receptors are SHC1 , PI-3 kinase , and PLC-gamma-1. ,PTM:Ligand-mediated auto-phosphorylation. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. Insulin receptor subfamily. ,similarity:Contains 1 protein kinase domain. ,similarity:Contains 2 Ig-like C2-type (immunoglobulin-like) domains. ,similarity:Contains 2 LRR (leucine-rich) repeats. ,subunit:Exists in a dynamic equilibrium between monomeric (low affinity) and dimeric (high affinity) structures. Binds SH2B2. Interacts with SQSTM1 and KIDINS220. ,tissue specificity:Isoform TrkB is widely expressed , mainly in the nervous tissue. In the CNS , expression is observed in the cerebral cortex , hippocampus , thalamus , choroid plexus , granular layer of the cerebellum , brain stem , and spinal cord. In the peripheral nervous system , it is expressed in many cranial ganglia , the ophtalmic nerve , the vestibular system , multiple facial structures , the submaxillary glands , and dorsal root ganglia. Isoform TrkB-T1 is expressed in multiple tissues , mainly in brain , pancreas , kidney and heart. Isoform TrkB-T-Shc is predominantly expressed in brain. ,
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