Abstract:
:Aberrant activation of the phosphoinositide 3-kinase pathway because of genetic mutations of essential signalling proteins has been associated with human diseases including cancer and diabetes. The pivotal role of 3-phosphoinositide-dependent kinase-1 in the PI3K signalling cascade has made it an attractive target for therapeutic intervention. The N-terminal lobe of the 3-phosphoinositide-dependent kinase-1 catalytic domain contains a docking site which recognizes the non-catalytic C-terminal hydrophobic motifs of certain substrate kinases. The binding of substrate in this so-called PDK1 Interacting Fragment pocket allows interaction with 3-phosphoinositide-dependent kinase-1 and enhanced phosphorylation of downstream kinases. NMR spectroscopy was used to a screen 3-phosphoinositide-dependent kinase-1 domain construct against a library of chemically diverse fragments in order to identify small, ligand-efficient fragments that might interact at either the ATP site or the allosteric PDK1 Interacting Fragment pocket. While majority of the fragment hits were determined to be ATP-site binders, several fragments appeared to interact with the PDK1 Interacting Fragment pocket. Ligand-induced changes in 1H-15N TROSY spectra acquired using uniformly 15N-enriched PDK1 provided evidence to distinguish ATP-site from PDK1 Interacting Fragment-site binding. Caliper assay data and 19F NMR assay data on the PDK1 Interacting Fragment pocket fragments and structurally related compounds identified them as potential allosteric activators of PDK1 function.
journal_name
Chem Biol Drug Desjournal_title
Chemical biology & drug designauthors
Stockman BJ,Kothe M,Kohls D,Weibley L,Connolly BJ,Sheils AL,Cao Q,Cheng AC,Yang L,Kamath AV,Ding YH,Charlton MEdoi
10.1111/j.1747-0285.2008.00768.xsubject
Has Abstractpub_date
2009-02-01 00:00:00pages
179-88issue
2eissn
1747-0277issn
1747-0285pii
JPP768journal_volume
73pub_type
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