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Borealis Arrestin Assays

Genetically-encoded fluorescent assay kits to detect real-time changes in arrestin recruitment.
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Great News!

We have brand-new, brighter Borealis Arrestin sensors, with new optimized kits for Oxytocin, 5-HT2A, Kappa Opioid, PAR2, and Delta Opioid receptors. Please contact us with questions or to let us know which other receptors would be useful. Thanks!
  • Measure kinetic cellular responses
  • Assess Arrestin recruitment using native, unmodified GPCRs
  • Monitor Arrestin and G-limb signaling using the same modality
  • Detect responses simultaneously or in parallel
  • Quantify Efficacy, prioritize hits
  • Detect agonist bias in living cell

Kits are available to detect arrestin recruitment at specific GPCRs. Kits include the Borealis Arrestin sensor, GPCR and relevant GRK in BacMam, positive control receptor and agonist, and sodium butyrate.

A common assay modality enables reliable measurements of Arrestin and G-protein mediated signaling.

Arrestin and Ca2+ activity at the AT1R measured in parallel plates.  Assays used: Green Borealis Arrestin assay and Green GECO Calcium Assay.

Angiotensin Receptor AT1R

Arrestin and diacylglycerol (DAG) activity at the AT1R measured simultaneously in the same plate on a BioTek Synergy MX plate reader. Assays used: Green Borealis Arrestin and Red DAG Assay.

cADDis cAMP Assay

DAG Assay

PIP2 Assay

GECO Ca2+ Assay

Simple protocol:

Analyze kinetic data with intuitive Pharmechanics Tools:

  • Use the Time Course Tool Pack which provides GraphPad Prism plugins for kinetic data analysis
  • Make direct comparisons of arrestin and G-limb activity
  • Monitor the time course of GPCR activity in a single assay

Beta Arrestin Assay Posters

Watching Biased Agonism at GPCRs in Real Time

Coloring Beta-arrestin signaling green, and G-protein signaling red, a new live cell assay for quantitatively measuring agonist bias at seven transmembrane domain receptors.

Measuring biased agonism with a kinetic analysis platform for real time data from fluorescent biosensors

Arrestin Assay FAQs

What β-arrestin biosensor kits are available?

Receptor-specific kits for AT1R, V2R, GLP-1R, MOP, β2AR, D1R, OTR, 5-HT2AR, KOR, PAR2, and DOR are shipping now. Don’t see what you need?

Please let us know [email protected].

What if my receptor of interest is not available?

New receptor-specific kits will be released on a regular basis, and we do offer assay services including custom optimization of the Borealis Arrestin assay for a given GPCR. Please contact us with questions about our services, or to let us know which receptor you would be interested in investigating with these tools.

Can I use a plate reader with the β-arrestin biosensor assay?

We’ve confirmed that the V2R, AT1R, β2AR, MOR, GLP-1R, D1R, OTR, KOR, 5HT2A, PAR2, and DOR receptors produce robust Z’ values on standard fluorescence plate readers in HEK293T cells. Other cell types and receptors may require imaging to capture signals from individual cells.

Can I detect a response in primary cultures or iPSCs?

We haven’t tried iPSCs or primary cultures for the arrestin biosensors yet, but if you are interested, we can help. BacMam transduces many primary cultures, iPSCs, and cell lines well, for example publications using other biosensors in these cell types click here.

What if I have an endogenously-expressed or cell line expressing my receptor of interest?

The response will depend on a number of factors including the receptor being used, the level of receptor expression, and the profile of GRK expression. For receptors we know respond well with our Borealis arrestin sensor (FAQ 1), we recommend using the relevant receptor-specific kit so you have the GPCR and GRK, if needed, in BacMam for optimization.

For receptors that have not been optimized yet, please email us at [email protected] with questions about optimization or to let us know which receptors we should test.

How do I analyze kinetic data?

Pharmechanics has developed a Time Course Tool Pack which provides GraphPad Prism plugins for analyzing kinetic data.

Our chapter in The Assay Guidance Manual from NIH  – Biosensor Assays for Measuring the Kinetics of G-Protein and Arrestin-Mediated Signaling in Live Cells – is another great resource.

Can I multiplex the green arrestin biosensor with a red sensor for cAMP, DAG, or Calcium?

Yes you can. We recommend confirming the positive controls in separate experiments before multiplexing the assay.

Choose your Receptor and Order an Arrestin Assay Kit

#D2000G Borealis-V2R

#D2010G Borealis-AT1R

#D2020G Borealis-GLP-1R

#D2030G Borealis-MOR

#D2040G Borealis-B2AR

#D2050G Borealis-D1R

#D2060G Borealis-OTR

#D2070G Borealis-5HT2AR

#D2080G Borealis-KOR

#D2090G Borealis-PAR2

#D2100G Borealis-DOR

Don't see your receptor of interest?