期刊
BRITISH JOURNAL OF PHARMACOLOGY
卷 153, 期 -, 页码 S90-S98出版社
WILEY
DOI: 10.1038/sj.bjp.0707571
关键词
adenosine; dopamine; opioid; fitting data; receptor dimers; receptor oligomers; allosteric regulation; cooperativity; drug targets
资金
- Intramural NIH HHS Funding Source: Medline
Almost all existing models for G-protein-coupled receptors ( GPCRs) are based on the occurrence of monomers. Recent studies show that many GPCRs are dimers. Therefore for some receptors dimers and not monomers are the main species interacting with hormones/neurotransmitters/drugs. There are reasons for equivocal interpretations of the data fitting to receptor dimers assuming they are monomers. Fitting data using a dimer-based model gives not only the equilibrium dissociation constants for high and low affinity binding to receptor dimers but also a 'cooperativity index' that reflects the molecular communication between monomers within the dimer. The dimer cooperativity index ( DC) is a valuable tool that enables to interpret and quantify, for instance, the effect of allosteric regulators. For different receptors heteromerization confers a specific functional property for the receptor heteromer that can be considered as a 'dimer fingerprint'. The occurrence of heteromers with different pharmacological and signalling properties opens a complete new field to search for novel drug targets useful to combat a variety of diseases and potentially with fewer side effects. Antagonists, which are quite common marketed drugs targeting GPCRs, display variable affinities when a given receptor is expressed with different heteromeric partners. This fact should be taken into account in the development of new drugs.
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