CBK006377 (CBK77) is a small molecule inhibitor of the ubiquitin-proteasome system (UPS) with EC50 of 4.3 uM in MelJuSo Ub-YFP cells (6h treatment).CBK77 (16h treatment, 10 uM) causes an irreversible, global impairment of the UPS collapse, accompanied by a general accumulation of ubiquitylated proteins and caspase-dependent cell death.CBK77 causes a global impairment of ubiquitin-dependent proteasomal degradation without global inhibition of proteasome or DUB activity.NAD(P)H:quinone oxidoreductase 1 (NQO1) is a critical factor for CBK77-mediated UPS impairment, CBK77 is an NQO1 substrate, efficiently metabolized by NQO1.CBK77 reduces growth of NQO1-proficient human cancer cells and xenograft tumors in mice without overt signs of toxicity.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.