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Based upon a pyrazolopyrimidine scaffold with potent CK2 inhibition exemplified by AstraZeneca, the SGC has developed a high-quality chemical probe and its negative control for protein kinase CK2.1 This compound shows equal potency in binding to both catalytic subunits of CK2: CK2α (CSNK2A1) and CK2α' (CSNK2A2). CK2 is a serine/threonine kinase that is part of the larger CMGC family, which is named after the initials of its subfamily members including cyclin-dependent kinases (CDK), mitogen-activated protein kinase (MAPK), glycogen synthase kinase (GSK), and CDC-like kinase (CLK). A plethora of biological functions have been ascribed to CK2 ranging from cell survival and proliferation to inflammation. CK2 phosphorylates more than 300 proteins and, via genetic and biochemical studies in a variety of experimental models, has been found to be both constitutively active and ubiquitously expressed.2-5 While CK2 inhibition has been widely studied in the context of cancer, pervasive use of non-selective CK2 inhibitors has confounded interpretation of results in many oncological studies.
Key profiling data:
Physical and chemical properties
C20 H21 N7 O
No. of chiral centres
No. of rotatable bonds
No. of hydrogen bond acceptors
No. of hydrogen bond donors
Stable as a solid at room temperature. DMSO stock solutions (up to 10 mM) are stable at -20oC
Soluble up to 10mM in DMSO
C23 H25 N7 O
SGC-CK2-1 was profiled in the KINOMEscan assay against 403 wild-type kinases at 1 μM. Only 11 kinases showed PoC <35 giving an S(35) at 1 μM = 0.027. Potential off-targets were tested in the nanoBRET target engagement assay (DYRK2) and via Eurofins radiometric and LANCE kinase assays. Data corresponding with off-target kinase activity is shown in the table below.
Enzymatic IC50 (nM)
Figure 1: SGC-CK2-1 was profiled in the KINOMEscan assay against 403 wild-type kinases at 1 μM and off-target kinases inhibited PoC <35 were tested in an orthogonal assay.
SGC-CK2-1N was also tested in the DiscoverX panel and 1 kinase had a PoC <35. The negative control was sent to Eurofins for testing in enzyme assays for CSNK2A1 and CSNK2A2. The results are in the table below.
Figure 2: SGC-CK2-1N was profiled in the KINOMEscan assay against 403 wild-type kinases at 1 μM and follow-up CK2α and CK2α' enzymatic assays were done to confirm no activity.
A NanoBRET assay was utilized to assess the binding affinity of SGC-CK2-1 to CK2α and CK2α'. The negative control shows no binding affinity for CK2α'.
Figure 1: SGC-CK2-1 and SGC-CK2-1N were profiled in the CK2 NanoBRET assays.