K-Ras(G12C) inhibitor 12 is an allosteric inhibitor of K-Ras(G12C) [1].
K-Ras is a GTPase and plays an important role in many signal transduction pathways. The mutation of K-Ras occurs in many cancers.
K-Ras(G12C) inhibitor 12 is an allosteric inhibitor of K-Ras(G12C). K-Ras(G12C) exhibited a slight preference for GTP. However, K-Ras(G12C) inhibitor 12 significantly reduced the affinity for GTP and led to the modification of K-Ras(G12C). Also, K-Ras(G12C) inhibitor 12 inhibited SOS-catalysed nucleotide exchange. In H1792 and H358 K-Ras(G12C)-mutant lung cancer cell lines, K-Ras(G12C) inhibitor 12 reduced the association of C-Raf and B-Raf with Ras. In H1792, H358, H23 and Calu-1 cell lines containing G12C mutations, K-Ras(G12C) inhibitor 12 decreased viability and induced apoptosis. K-Ras(G12C) inhibitor 12 exhibited EC50 value of 0.32 µM in H1792 cells. Also, the H1792 cells exhibited low levels of K-Ras GTP, which was consistent with the preference of K-Ras(G12C) inhibitor 12 to K-Ras GDP [1].
Reference:
[1]. Ostrem JM1, Peters U, Sos ML, et al. K-Ras(G12C) inhibitors allosterically control GTP affinity and effector interactions. Nature, 2013, 503(7477): 548-551.