Study of the PDK1/AKT signaling pathway using selective PDK1 inhibitors, HCS, and enhanced biochemical assays

The PI3K/AKT signaling pathway has an important regulatory role in cancer cell growth and tumorigenesis. Signal transduction through this pathway requires the assembly and activation of PDK1 and AKT at the plasma membrane. On activation of the pathway, PDK1 and AKT1/2 translocate to the membrane and...

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Veröffentlicht in:Analytical biochemistry 2011-07, Vol.414 (2), p.179-186
Hauptverfasser: Hofler, Alexandra, Nichols, Tim, Grant, Stephan, Lingardo, Laura, Esposito, Edward A., Gridley, Scott, Murphy, Sean T., Kath, John C., Cronin, Ciarán N., Kraus, Michelle, Alton, Gordon, Xie, Zhi, Sutton, Scott, Gehring, Mike, Ermolieff, Jacques
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container_end_page 186
container_issue 2
container_start_page 179
container_title Analytical biochemistry
container_volume 414
creator Hofler, Alexandra
Nichols, Tim
Grant, Stephan
Lingardo, Laura
Esposito, Edward A.
Gridley, Scott
Murphy, Sean T.
Kath, John C.
Cronin, Ciarán N.
Kraus, Michelle
Alton, Gordon
Xie, Zhi
Sutton, Scott
Gehring, Mike
Ermolieff, Jacques
description The PI3K/AKT signaling pathway has an important regulatory role in cancer cell growth and tumorigenesis. Signal transduction through this pathway requires the assembly and activation of PDK1 and AKT at the plasma membrane. On activation of the pathway, PDK1 and AKT1/2 translocate to the membrane and bind to phosphatidylinositol-(3,4,5)-trisphosphate (PIP 3) through interaction with their pleckstrin-homology domains. A biochemical method was developed to measure the kinase activity of PDK1 and AKT1/2, utilizing nickel-chelating coated lipid vesicles as a way to mimic the membrane environment. The presence of these vesicles in the reaction buffer enhanced the specific activity of the His-tagged PDK1 (full-length, and the truncated kinase domain) and the activity of the full-length His-tagged AKT1 and AKT2 when assayed in a cascade-type reaction. This enhanced biochemical assay is also suitable for measuring the inhibition of PDK1 by several selective compounds from the carbonyl-4-amino-pyrrolopyrimidine (CAP) series. One of these inhibitors, PF-5168899, was further evaluated using a high content cell-based assay in the presence of CHO cells engineered with GFP-PDK1.
doi_str_mv 10.1016/j.ab.2011.03.013
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subjects 3-Phosphoinositide-Dependent Protein Kinases
Adenine - analogs & derivatives
Adenine - chemistry
Adenine - pharmacology
AKT
Animals
carcinogenesis
cell growth
cells
CHO Cells
Cricetinae
Cricetulus
Enzyme Assays - methods
Histidine - genetics
Histidine - metabolism
Humans
Kinase inhibitor
Kinetics
membranes
Oligopeptides - genetics
Oligopeptides - metabolism
PDK1
Phosphorylation
plasma membrane
plasma membranes
Protein Kinase Inhibitors - chemistry
Protein Kinase Inhibitors - pharmacology
Protein-Serine-Threonine Kinases - antagonists & inhibitors
Protein-Serine-Threonine Kinases - genetics
Protein-Serine-Threonine Kinases - metabolism
Proto-Oncogene Proteins c-akt - antagonists & inhibitors
Proto-Oncogene Proteins c-akt - genetics
Proto-Oncogene Proteins c-akt - metabolism
Pyrazines - chemistry
Pyrazines - pharmacology
Recombinant Proteins - antagonists & inhibitors
Recombinant Proteins - genetics
Recombinant Proteins - metabolism
Signal Transduction
tagging
Template-directed assembly (TDA)
title Study of the PDK1/AKT signaling pathway using selective PDK1 inhibitors, HCS, and enhanced biochemical assays
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