ITC; 85 nM by SPR
IC50 = 31 nM in Scintillation proximity assay, and 66 nM in LC-MS detection assay under balanced conditions.
PDB ID for probe-target interaction (3D structure):
4RYL
Structure-activity relationship:
Yes
Potency assay (off target):
Selective for PRMT3 over 31 DNA, RNA and protein methyltransferases.
Probe Selectivity in Vitro:
Selective for PRMT3 over 250 kinases, GPCRs, ion channels and transporters. Modest off-target activity was noted at 10,000 nM SGC707: 69% inhibition of HTR2B (Ki > 15,000 nM); 56% inhibition of BRSK1; 60% inhibition of DLK1; 55% inhibition of RPS6KA4; 58% inhibition of PRKG2, and 61% inhibition of PRKX.
In cell validation
Potency in cells:
EC50
1.3 uM
Potency assay (cells):
In CELL Hunter Assay in HEK293 cells, and IC50 = 225 nM in a cellular protein substrate methylation assay.
Target engagement assay (cells):
Direct: In CELL Hunter Assay
Toxicity
Cytoxicity assay:
Yes
Notes on cytotoxicity:
Cytotoxicity noted at high concentration (50 or 100 uM) in 293, LnCap, U2OS, HFF, MCF-7, and MDA-MB231 cells.