Serotonin Receptor 2B Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| HTR2B | |
|---|---|
| Protein Name | 5-Hydroxytryptamine Receptor 2B |
| Gene | HTR2B |
| UniProt ID | Q9H3Y9 |
| PDB IDs | 5TIH, 6DRX |
| Molecular Weight | 55.4 kDa |
| Subcellular Localization | Plasma Membrane |
| Protein Family | GPCR, Class A, Serotonin |
The HTR2B protein belongs to the GPCR, Class A, Serotonin family. The protein structure consists of seven transmembrane domains connected by three extracellular and three intracellular loops. The ligand-binding pocket is located within the transmembrane domains. Key structural features include a conserved DRY motif at the cytoplasmic end of TM3, which is critical for G protein coupling. The third intracellular loop contains major determinants for Gq protein specificity. The C-terminal tail contains serine/threonine residues that serve as phosphorylation sites for receptor desensitization and internalization.
The serotonin 2B receptor (5-HT2B) is a Gq-coupled GPCR that activates phospholipase C (PLC) upon serotonin binding. This leads to generation of inositol trisphosphate (IP3) and diacylglycerol (DAG), causing intracellular calcium release and protein kinase C (PKC) activation. 5-HT2B is unique among 5-HT2 receptors for its ability to activate multiple signaling pathways including ERK, PI3K/Akt, and RhoA. In the brain, 5-HT2B is expressed in the prefrontal cortex, hippocampus, and basal ganglia. It plays roles in mood, anxiety, and memory consolidation. 5-HT2B signaling also affects neurogenesis and neural stem cell proliferation. Dysregulation is implicated in neuroinflammation and neurodegenerative processes.
5-HT2B receptor expression in the brain includes:
HTR2B is implicated in neurodegenerative diseases through various mechanisms:
Key areas for future research include:
The study of Serotonin Receptor 2B Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.