Tropomyosin receptor kinase B

Schematic representation of TrkB receptor structure.

Tropomyosin receptor kinase B (TrkB) is a receptor tyrosine kinase that is encoded by the NTRK2 gene in humans. TrkB is a member of the neurotrophin receptor family and plays a critical role in the development and function of the nervous system.

Structure

TrkB is a transmembrane protein that consists of an extracellular domain, a single transmembrane helix, and an intracellular tyrosine kinase domain. The extracellular domain is responsible for binding to its ligands, primarily brain-derived neurotrophic factor (BDNF), neurotrophin-4 (NT-4), and neurotrophin-3 (NT-3). Upon ligand binding, TrkB undergoes dimerization and autophosphorylation, which activates its kinase activity.

Function

TrkB is involved in various cellular processes, including neuronal survival, differentiation, and synaptic plasticity. It is crucial for the development of the central nervous system and is implicated in learning and memory. TrkB signaling pathways include the PI3K/AKT pathway, the MAPK/ERK pathway, and the PLC_ pathway, each contributing to different cellular responses.

Clinical Significance

TrkB has been associated with several neurological and psychiatric disorders. Alterations in TrkB signaling have been linked to conditions such as depression, anxiety, schizophrenia, and Alzheimer's disease. Therapeutic strategies targeting TrkB are being explored for their potential in treating these disorders.

Related Pages

• Neurotrophin
• Receptor tyrosine kinase
• Brain-derived neurotrophic factor
• Nervous system