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© Institut Pasteur
Cells infected for 24 hrs with C. Trachomatis. The cell nuclei are labelled in blue, the bacteria appear yellow, within the inclusion lumen. A bacterial protein secreted out the inclusion into the host cytoplasm id labelled in red.
Publication : Chemistry & biology

Substrate-selective inhibition of protein kinase PDK1 by small compounds that bind to the PIF-pocket allosteric docking site

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Chemistry & biology - 21 Sep 2012

Busschots K, Lopez-Garcia LA, Lammi C, Stroba A, Zeuzem S, Piiper A, Alzari PM, Neimanis S, Arencibia JM, Engel M, Schulze JO, Biondi RM

Link to Pubmed [PMID] – 22999883

Chem. Biol. 2012 Sep;19(9):1152-63

The PIF-pocket of AGC protein kinases participates in the physiologic mechanism of regulation by acting as a docking site for substrates and as a switch for the transduction of the conformational changes needed for activation or inhibition. We describe the effects of compounds that bind to the PIF-pocket of PDK1. In vitro, PS210 is a potent activator of PDK1, and the crystal structure of the PDK1-ATP-PS210 complex shows that PS210 stimulates the closure of the kinase domain. However, in cells, the prodrug of PS210 (PS423) acts as a substrate-selective inhibitor of PDK1, inhibiting the phosphorylation and activation of S6K, which requires docking to the PIF-pocket, but not affecting PKB/Akt. This work describes a tool to study the dynamics of PDK1 activity and a potential approach for drug discovery.

http://www.ncbi.nlm.nih.gov/pubmed/22999883