4ks8

Publication Abstract from PubMed

The p21-activated kinases (PAKs) are important effectors of Rho-family small GTPases. The PAK family consists of two groups, type I and type II, which have different modes of regulation and signaling. PAK6, a type II PAK, influences behavior and locomotor function in mice and has an ascribed role in androgen receptor signaling. Here we show that PAK6 has a peptide substrate specificity very similar to the other type II PAKs, PAK4 and PAK5 (PAK7). We find that PAK6 catalytic activity is inhibited by a peptide corresponding to its N-terminal pseudosubstrate. Introduction of a melanoma-associated mutation, P52L, into this peptide reduces pseudosubstrate autoinhibition of PAK6, and increases phosphorylation of its substrate PACSIN1 (Syndapin I) in cells. Finally we determine two co-crystal structures of PAK6 catalytic domain in complex with ATP-competitive inhibitors. We determined the 1.4 A co-crystal structure of PAK6 with the type II PAK inhibitor PF-3758309, and the 1.95 A co-crystal structure of PAK6 with sunitinib. These findings provide new insights into the structure-function relationships of PAK6 and may facilitate development of PAK6 targeted therapies.

Substrate and Inhibitor Specificity of the Type II p21-Activated Kinase, PAK6.,Gao J, Ha BH, Lou HJ, Morse EM, Zhang R, Calderwood DA, Turk BE, Boggon TJ PLoS One. 2013 Oct 28;8(10):e77818. doi: 10.1371/journal.pone.0077818. PMID:24204982^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.