PMID: 20052711

Authors:

Marcotte DJ, Liu YT, Arduini RM, Hession CA, Miatkowski K, Wildes CP, Cullen PF, Hong V, Hopkins BT, Mertsching E, Jenkins TJ, Romanowski MJ, Baker DP, Silvian LF

Title:

Structures of human Bruton's tyrosine kinase in active and inactive conformations suggest a mechanism of activation for tec family kinases.

Journal:

Protein Sci. 2010 Jan 5.

Abstract:

Bruton's tyrosine kinase (BTK), a member of the TEC family of kinases, plays a crucial role in B cell maturation and mast cell activation. Though the structures of the unphosphorylated mouse BTK kinase domain and the unphosphorylated and phosphorylated kinase domains of human ITK are known, understanding the kinase selectivity profiles of BTK inhibitors has been hampered by the lack of availability of a high resolution, ligand-bound BTK structure. Here, we report the crystal structures of the human BTK kinase domain bound to either Dasatinib (BMS-354825) at 1.9A resolution or to 4-amino-5-(4-phenoxyphenyl)-7H-pyrrolospyrimidin-7-yl-cyclopentane at 1.6A resolution. This data provides information relevant to the development of small molecule inhibitors targeting BTK and the TEC family of non-receptor tyrosine kinases. Analysis of the structural differences between the TEC and Src families of kinases near the Trp-Glu-Ile motif in the N-terminal region of the kinase domain suggests a mechanism of regulation of the TEC family members.