| Bioactivity | Raphin1 is an orally bioavailable, selective inhibitor of the regulatory phosphatase PPP1R15B (R15B). Raphin1 binds strongly to the R15B-PP1c holophosphatase (Kd=33 nM), and shows ~30-fold selective in binding R15B-PP1c over R15A-PP1c. Raphin1 crosses the blood-brain barrier, and reduces organismal and molecular deficits in a mouse model of a protein misfolding disease[1]. |
| Target | Kd：33 nM (R15B-PP1c holophosphatase) |
| Invitro | Raphin1 causes a rapid and transient accumulation of its phosphorylated substrate, resulting in a transient attenuation of protein synthesis[1].Raphin1 inhibits the recombinant R15B-PP1c holoenzyme, but not the closely related R15A-PP1c, by interfering with substrate recruitment[1]. |
| In Vivo | Raphin1 improves weight of HD82Q mice treated from 4 to ∼10 weeks of age with 2 mg/kg of Raphin1 once a day by oral gavage. Raphin1 also decreases SDS-insoluble huntingtin assemblies and nuclear inclusions in the cortex of HD82Q mice[1]. |
| Name | Raphin1 |
| CAS | 2022961-17-5 |
| Formula | C8H8Cl2N4 |
| Molar Mass | 231.08 |
| Transport | Room temperature in continental US; may vary elsewhere. |
| Storage | Please store the product under the recommended conditions in the Certificate of Analysis. |
| Reference | [1]. Krzyzosiak A, et al. Target-Based Discovery of an Inhibitor of the Regulatory Phosphatase PPP1R15B. Cell. 2018 Aug 23;174(5):1216-1228.e19. |