JH-XI-10-02 is a PROTAC connected by ligands for Cereblon and CDK. JH-XI-10-02 is a highly potent and selective PROTAC CDK8 degrader, with an IC50 of 159 nM. JH-XI-10-02 causes proteasomal degradation, does not affect CDK8 mRNA levels. JH-XI-10-02 shows no effect on CDK19[1].
JH-XI-10-02, a bivalent small molecule degrader, recruits the E3 ligase CRL4Cereblon to promote the ubiquitination and proteosomal degradation of CDK8[1]. JH-XI-10-02 (1 μM) induces partial degradation of CDK8 in Jurkat cells upon treatment for 6 h. JH-XI-10-02 (1 μM) induces significant degradation of CDK8 after treatment for 24 h[1]. JH-XI-10-02 induces degradation of CDK8 at 5 μM in WT Molt4 cells, no degradation in CRBN null Molt4 cells at any concentration (0.1-5 μM) in WT Molt4 cells and Molt4 cells where CRBN had been subject to CRISPER/CAS9-mediated deletion for 24 h[1].
[1]. Hatcher JM, et al. Development of Highly Potent and Selective Steroidal Inhibitors and Degraders of CDK8. ACS Med Chem Lett. 2018 Mar 18;9(6):540-545.