High-hanging fruits harvested by Tanso Biosciences' assay technology

G-protein-coupled receptors (GPCRs) are crucial in biology and medicine, but only a fraction of them have drugs to target them. One of the hardest barriers to GPCR research has been the lack of satisfactory assays.

To overcome this challenge and promote drug development, scientists at Tanso Biosciences have innovated a versatile and sensitive assay method (international patent filed, publication number WO/2020/026979). Based on this platform, we engage in drug discovery for orphan GPCRs and provide contract assay services.

Drug Discovery

Comprehensive Orphan GPCR Drug Discovery Project

Research on GPCRs, especially orphan GPCRs, has been hindered by a lack of adequate assays. To overcome the barriers of GPCR drug discovery, we have innovated a high-performance functional assay. It works excellently for all receptors coupled with any of the major Gα proteins including Gq, Gs, Gi/o, and G12/13.

We have taken advantage of our proprietary assay and embarked on orphan GPCR drug discovery, broadly targeting ~100 of them. As a first step, compound library screening is ongoing for their agonists, with a priority on disease-associated receptors.

We have identified agonists for six orphan GPCRs, namely, GPR39, GPR55, GPR65, GPR68, GPR132, and P2RY10, and characterized their concentration-dependent potency.

Agonists identified in the previous step will be further characterized. They will also play crucial roles in screening for orphan GPCR antagonists.

Contract Services

Tanso Biosciences provides super-sensitive and reliable functional assays for more than 300 human G-protein-coupled receptors (GPCRs) to expand frontiers, accelerate drug discovery, and reduce R&D risks.

Assay Line-Up

Besides assays illustrated here, we can arrange various tests, such as allosteric modulation and GPCR homologs in other species than human.

Large-Scale Comprehensive Panels

Our large-scale panel assays allow comprehensive screening for up to 200 non-orphan GPCRs and 94 orphan GPCRs.



FlexPanel48 is reasonable small-scale panels with 48 receptors and consists of custom panels and therapeutic area panels.

Custom Panels

One can choose any 48 receptors from 200 non-orphan GPCRs and 94 orphan GPCRs.

Therapeutic Area Panels

Panels of 48 GPCRs associated with one of 13 therapeutic areas.

  • Immunology/Infection
  • Oncology
  • Hematology
  • Endocrinology/Metabolism
  • Psychiatry
  • Neurology
  • Ophthalmology
  • Cardiology
  • Respiratory
  • Gastrointestinal
  • Dermatology
  • Musculoskeletal
  • Urology/Reproduction
TAK-875 on metabolism/endocrinology panel


TAK-875, a Phase 3 antidiabetic, was screened in the agonist mode in the FlexPanel48 Endocrinology/Metabolism Panel. The agent selectively activated free fatty acid receptor 1 (FFAR1).

Concentration Dependence

We analyze concentration dependence n various assay modes (agonist, inverse agonist, antagonist, PAM, NAM) and are flexible in study design, such as the numbers of replicates and concentrations.

Concentration-response curve for TAK875 against FFAR1


TAK-875, a Phase 3 antidiabetic, was shown to activate FFAR1 in a concentration-dependent manner.

Proton-sensing GPCRs

Contact Us

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Ordering Process

Service flow chart

Request a quotation

We hear about the study outline and propose experiments. A non-disclosure agreement is optional.


Place an order

You also ship your compounds to our lab and pay the fee via bank transfer.


Wait for a while

The turnaround time may be as short as two weeks but depends on the study scale and design and the backlog of orders.


Receive the report

We provide the study report via email.


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