Biology:Bombesin-like receptor 3

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Short description: Protein-coding gene in humans


A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example

The bombesin receptor subtype 3 also known as BRS-3 or BB3[1] is a protein which in humans is encoded by the BRS3 gene.[2][3]

Function

Mammalian bombesin-like peptides are widely distributed in the central nervous system as well as in the gastrointestinal tract, where they modulate smooth-muscle contraction, exocrine and endocrine processes, metabolism, and behavior. They bind to G protein-coupled receptors on the cell surface to elicit their effects. Bombesin-like peptide receptors include gastrin-releasing peptide receptor, neuromedin B receptor, and bombesin-like receptor-3 (BRS3; this article).[3][4]

BB3 is a G protein-coupled receptor.[2] BB3 only interacts with known naturally occurring bombesin-related peptides with low affinity and therefore, as it has no natural high-affinity ligand, is classified as an orphan receptor.[2][5][6]

References

  1. "Bombesin Receptors: BB3". International Union of Basic and Clinical Pharmacology. http://www.iuphar-db.org/GPCR/ReceptorDisplayForward?receptorID=2958. 
  2. 2.0 2.1 2.2 "BRS-3: a novel bombesin receptor subtype selectively expressed in testis and lung carcinoma cells". J. Biol. Chem. 268 (8): 5979–84. March 1993. doi:10.1016/S0021-9258(18)53415-3. PMID 8383682. 
  3. 3.0 3.1 "Cloning and expression of the neuromedin B receptor and the third subtype of bombesin receptor genes in the mouse". Brain Res. 762 (1–2): 165–72. July 1997. doi:10.1016/S0006-8993(97)00380-6. PMID 9262170. 
  4. "Entrez Gene: BRS3 bombesin-like receptor 3". https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=680. 
  5. "Discovery of a high affinity radioligand for the human orphan receptor, bombesin receptor subtype 3, which demonstrates that it has a uniquepharmacology compared with other mammalian bombesin receptors". J. Biol. Chem. 272 (41): 26062–26071. 1997. doi:10.1074/jbc.272.41.26062. PMID 9325344. 
  6. "International Union of Pharmacology: The Bombesin Receptors. Nomenclature, distribution, pharmacology, signaling and functions in normal and diseased states". Pharmacol. Rev. 60 (1): 1–42. 2007. doi:10.1124/pr.107.07108. PMID 18055507. 

Further reading

External links

This article incorporates text from the United States National Library of Medicine, which is in the public domain.