VER-155008 is a potent Hsp70 family inhibitor with IC50 of 0.5 μM, 2.6 μM, and 2.6 μM in cell-free assays for HSP70, HSC70, and GRP78, respectively, >100-fold selectivity over HSP90.

HSC70:2.6 μM, GRP78:2.6 μM, HSP70:0.5 μM

Hsc70, Hsp70 and Grp78 ?uorescence polarisation (FP) assay: The FP assay for Hsp70 is conducted in aqueous buffer consisting of 100 mM Tris pH 7.4, 150 mM KCl and 5 mM CaCl2, in a final assay volume of 100 μl, using 96 well black polystyrene high bind plates with a Fusion plate reader. N6-(6-amino)hexyl-ATP-5-FAM and the in-house protein preparation of GST-HSP70 3-382 have final concentrations in the assay of 20 nM and 400 nM, respectively. Compounds are tested as 10-point IC50s, with a final DMSO concentration of 5%. Assay mixtures are incubated for 3 h prior to reading on the Fusion (ex 485 nm; em 535 nm). The data is fitted using a 4 parameter logistical data model by XLFit 4. The FP assay for Hsc70 and Grp78 is carried out as described for Hsp70 using the same N6 -(6-amino)hexyl-ATP-5-FAM as the FP probe with the following modi?cations. For Hsc70, the protein and probe concentrations are 0.3 μM and 20 nM, respectively with a 30 min incubation at 22℃ while for Grp78, the protein and probe concentrations are 2 μM and 10 nM, respectively with a 2 h incubation at 22℃. The KD for the FAM-ATP probe was 0.24 μM for Hsc70 and 2 μM for Grp78.

All cell lines are grown in DMEM/10% FCS with GlutaMAX-I in a humidified atmosphere of 5% CO2 in air. Cell proliferation is determined using the sulforhodamine B (SRB) assay.(Only for Reference)

H2O: < 1 mg/mL (insoluble)

DMSO: 79.17 mg/mL (142.29 mM), Sonication is recommended.

10% DMSO+40% PEG300+5% Tween 80+45% Saline: 2 mg/mL (3.59 mM), Sonication is recommended.