CLK1: Human cdc2-like kinase in complex with a novel substituted indole inhibitor
PDB Code: 2VAG
The Clk family consists of four kinases that display so-called dual specificity, i.e., they are capable of phosphorylating both Ser/Thr as well as Tyr residues.
CLK homologues have been isolated from a number of organisms including Arabidopsis, Drosophila, mouse and human. The kinase domain of CLK family members is located at the C terminus and contains the family signature motif ‘EHLAMMERILG’, giving rise to the name of these kinases: ‘LAMMER’ kinases. Mutations in the Drosophila CLK homologue, darkener of apricot (DOA) suggest that CLK family members play an important role during development. Mutations in DOA are embryonic lethal and lead to defects in differentiation, including abnormalities in segmentation, eye formation, and neuronal development.
CLK1 also plays an important role regulating RNA splicing. It has been shown that CLK1 forms complexes with and phosphorylates members of the SR family of splicing factors. Overexpression affects splicing site selection of pre-mRNA of both its own transcript and adenovirus E1A transcripts in vivo which led to the current model that Clk family members regulate alternative splicing by phosphorylation of SR proteins. In addition, overexpression of catalytically inactive CLK1 localize to nuclear speckles where splicing factors are concentrated, whereas the wild-type enzymes distribute throughout the nucleus and cause speckles to dissolve.
We solved the structure of human CLK1 kinase domain at 1.8 Å resolution in complex with a novel substituted indole inhibitor.

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