Dopamine D2 and D4 receptor heteromerization and its allosteric receptor-receptor interactions.
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Borroto-Escuela DO, Van Craenenbroeck K, Romero-Fernandez W, Guidolin D, Woods AS, Rivera A, Haegeman G, Agnati LF, Tarakanov AO, Fuxe K
Dopamine D2 and D4 receptor heteromerization and its allosteric receptor-receptor interactions.
Biochem Biophys Res Commun. 2011 Jan 28;404(4):928-34. doi: 10.1016/j.bbrc.2010.12.083. Epub 2010 Dec 22.
- PubMed ID
- 21184734 [ View in PubMed]
- Abstract
Dopamine D(2) and D(4) receptors partially codistribute in the dorsal striatum and appear to play a fundamental role in complex behaviors and motor function. The discovery of D(2)R-D(4.)(x)R (D(4.2)R, D(4.4)R or D(4.7)R) heteromers has been made in cellular models using co-immunoprecipitation, in situ Proximity Ligation Assays and BRET(1) techniques with the D(2)R and D(4.7)R receptors being the least effective in forming heteromers. Allosteric receptor-receptor interactions in D(2)R-D(4.2)R and D(2)R-D(4.4) R heteromers were observed using the MAPK assays indicating the existence of an enhancing allosteric receptor-receptor interaction in the corresponding heteromers between the two orthosteric binding sites. The bioinformatic predictions suggest the existence of a basic set of common triplets (ALQ and LRA) in the two participating receptors that may contribute to the receptor-receptor interaction interfaces.