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Biological Activity of CK-636
CK-636(CK-0944636) is a small molecule inhibitor of Arp2/3 complex; Inhibitor of actin polymerization; Cell permeable inhibitor of human (IC50=4μM), fission yeast (IC50=24μM) and bovine (IC50=32μM) Arp2/3 complex between Arp2 and Arp3. Inhibits actin polymerization (IC50=22μM).
IC50 value: 4/24/32 uM (Human/fission yeast/bovine Arp2/3) 
Target: Arp2/3 complex; actin polymerization
CK-636 binds between Arp2 and Arp3, where it appears to block movement of Arp2 and Arp3 into their active conformation. CK-636 inserts into the hydrophobic core of Arp3 and alters its conformation. Both classes of compounds inhibit formation of actin filament comet tails by Listeria and podosomes by monocytes.
. Nolen BJ, et al. Characterization of two classes of small molecule inhibitors of Arp2/3 complex. Nature. 2009 Aug 20;460(7258):1031-4.