For research use only. Not for therapeutic Use.
G-5555 is a potent p21-activated kinase 1 (PAK1) inhibitor with Kis of 3.7 nM and 11 nM for PAK1 and PAK2, respectively.
G-5555 is a potent PAK1 inhibitor with a Ki of 3.7 nM. G-5555 shows excellent kinase selectivity and inhibits only eight out of the 235 kinases tested other than PAK1 with inhibition >70%: PAK2, PAK3, KHS1, Lck, MST3, MST4, SIK2, and YSK1. The IC50s of G-5555 against SIK2, PAK2, KHS1, MST4, YSK1, MST3 and Lck are 9, 11, 10, 20, 34, 43, 52 nM, respectively. In general, G-5555 demonstrates high selectivity for the group I PAKs. There is negligible activity for G-5555 against the hERG channel with IC50 more than 10 μM in a patch clamp assay[1]. G-5555 potently inhibits PAK2, with a Ki of 11 nM. In an array of 23 breast cancer cell lines, G-5555 has significantly greater growth inhibitory activity in cell lines that are PAK-amplified compared to non-amplified lines[2].
G-5555 exhibits low blood clearance and an acceptable half-life. Good oral exposure (AUC = 30 μM h) and high oral bioavailability (F = 80%) are achieved[1]. In an H292 non-small cell lunger cancer (NSCLC) xenograft study in mice, G-5555 inhibits phosphorylation of the PAK1/2 downstream substrate mitogen-activated protein kinase 1 (MEK1) S298 and, when administered at an oral dose of 25 mg/kg b.i.d., imparts 60% tumor growth inhibition in this model and a PAK1 amplified breast cancer xenograft model, MDAMB-175[2].
| Catalog Number | I006921 |
| CAS Number | 1648863-90-4 |
| Synonyms | 8-[(5-amino-1,3-dioxan-2-yl)methyl]-6-[2-chloro-4-(6-methylpyridin-2-yl)phenyl]-2-(methylamino)pyrido[2,3-d]pyrimidin-7-one |
| Molecular Formula | C25H25ClN6O3 |
| Purity | ≥95% |
| InChI | InChI=1S/C25H25ClN6O3/c1-14-4-3-5-21(30-14)15-6-7-18(20(26)9-15)19-8-16-10-29-25(28-2)31-23(16)32(24(19)33)11-22-34-12-17(27)13-35-22/h3-10,17,22H,11-13,27H2,1-2H3,(H,28,29,31) |
| InChIKey | ZBCMHWUFWQFPLV-UHFFFAOYSA-N |
| SMILES | CC1=NC(=CC=C1)C2=CC(=C(C=C2)C3=CC4=CN=C(N=C4N(C3=O)CC5OCC(CO5)N)NC)Cl |
| Reference | [1]. Ndubaku CO, et al. Design of Selective PAK1 Inhibitor G-5555: Improving Properties by Employing an Unorthodox Low-pK a Polar Moiety. ACS Med Chem Lett. 2015 Oct 31;6(12):1241-6. [2]. Rudolph J, et al. Chemically Diverse Group I p21-Activated Kinase (PAK) Inhibitors Impart Acute Cardiovascular Toxicity with a Narrow Therapeutic Window. J Med Chem. 2016 Jun 9;59(11):5520-41. |
