Abstract
G protein-coupled receptors (GPCRs) have long been considered to be
monomeric membrane proteins. Although numerous recent studies have
indicated that GPCRs can form multimeric complexes, the functional
and pharmacological consequences of this phenomenon have remained
elusive. With the discovery that the functional GABA(B) receptor
is an obligate heterodimer and with the use of energy transfer technologies,
it is now accepted that GPCRs can form heteromultimers. In some cases,
specific properties of such heteromers not shared by their respective
homomers have been reported. Although in most cases these properties
have only been observed in heterologous expression systems, there
are a few reports describing data consistent with such heteromultimeric
GPCR complexes also existing in native tissues. The present article
illustrates well-documented examples of such native multimeric complexes,
lists a number of recommendations for recognition and acceptance
of such multimeric receptors, and gives recommendations for their
nomenclature.
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