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An inhibitor of the ubiquitin-proteasome system
RAMB4 is an inhibitor of the ubiquitin-proteasome system.1 It increases the levels of polyubiquitinated proteins in HeLa cervical cancer cells, but does not inhibit the chymotrypsin-like, trypsin-like, or peptidylglutamyl peptide hydrolyzing-like activities of the 20S proteasome, in cell-free assays when used at a concentration of 10 ?M. RAMB4 decreases the viability of HeLa cells (IC50 = 2 ?M).
1.Anchoori, R.K., Khan, S.R., Sueblinvong, T., et al.Stressing the ubiquitin-proteasome system without 20S proteolytic inhibition selectively kills cervical cancer cellsPLoS One6(8)e23888(2011)
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