GPCR Arrestin Assays
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United States of America Patent
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Issued Date -
May 13, 2010
app pub date -
Oct 10, 2009
filing date -
Oct 10, 2008
priority date (Note) -
Abandoned
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Abstract
Sensitive assays for candidate compounds affecting GPCR activity are provided using a cell containing fusion proteins comprising a first fusion protein comprising (a) a target GPCR fused to a small fragment of β-galactosidase through a linker comprising a phosphorylation site or (b) a GPCR or a protein of interest, where the GPCR and protein of interest form a complex and one of them is fused to the small fragment of β-galactosidase; and a second fusion protein comprising arrestin fused to a large fragment of β-galactosidase. In (a), the affinity of the small and large fragments is optimized based on the background to signal ratio and the absolute signal observed. The assay is performed using a β-galactosidase substrate that provides a detectable optical signal.
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