Live Cell β-Arrestin Assays
A genetically-encoded fluorescent arrestin assay that detects changes in arrestin recruitment in real time.
- Detect agonist bias in living cells
- Measure kinetic cellular responses
- Monitor Arrestin and G-limb signaling using the same modality
- Detect responses simultaneously or in parallel
Kits are available to detect arrestin recruitment at specific GPCRs. They include the Arrestin sensor, GPCR and relevant GRK in BacMam, positive control agonist, and sodium butyrate.
Kits for Angiotensin II (AT1R), Vasopressin (V2R), GLP-1, Mu Opioid (OPRM1), and beta2-adrenergic (B2AR) receptors are available now. We are continuing to validate new receptors, if you do not see your receptor of interest please send us an email!
Detecting Agonist Bias
Easily capture signaling kinetics
Make direct comparisons of arrestin and G-limb activity
- Monitor responses in parallel plates using the same assay modality
- Compare green Arrestin and red G-limb responses in the same well
Monitor the time course of GPCR activity in a single assay
- Use validated, intuitive Pharmechanics analysis to assess bias with kinetic data
cADDis cAMP Assay
GECO Ca2+ Assay
Arrestin Assay FAQs
Can I use a plate reader with the β-arrestin biosensor assay?
We’ve confirmed that the AT1R, β2AR, MOP, GLP-1R and V2R receptors produce robust Z’ values on standard fluorescence plate readers in HEK293T, CHO and U2OS 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.
What if I have a cell line already expressing my receptor of interest?
The response will depend on the level of receptor expression in your cell line. If the level is too low in your cell line, we recommend using a BacMam vector to optimize receptor expression. We offer a number of GPCRs in high titer BacMam stock.
Can I detect the activity of endogenously expressed receptors with this assay?
Success will depend on the level of endogenous receptor expression.
Can I express the receptor using a plasmid?
You can, but this will increase variability and reduce Z’. For optimal results, we recommend adding the receptor packaged in BacMam so that you can control the level of receptor expression and reduce cell-to-cell variability.
Can I multiplex the green arrestin biosensor with a red sensor for Ca2+, DAG or cAMP?
Yes you can. We recommend confirming the positive controls in separate experiments before multiplexing the assay.
How do I analyze kinetic data?
What β-arrestin biosensor kits are available?
What if my receptor of interest is not available?
New receptor-specific kits are coming on line on a regular basis. Please let us know if you do not see the assay you need on our list. We offer custom assay services including:
- Packaging your receptor in BacMam so you can optimize the arrestin assay.
The BacMam delivery system allows you to easily control receptor expression and produces low cell-to-cell variability. You receive ~175 mL of high titer BacMam vector, a panel of GRKs, a specific protocol for assay optimization and a 10 mL arrestin biosensor kit.
- Custom Assay Optimization
Each receptor is unique when it comes to arrestin biology. To capture the optimal kinetic response it’s important to optimize assay conditions for your receptor. We package your receptor in BacMam, and optimize conditions for your receptor. You receive a detailed report including sample data, a specific protocol, and ~175 mL of your receptor in high titer BacMam stock.