Predicting kinase activity in angiotensin receptor phosphoproteomes based on sequence-motifs and interactions.
Recent progress in the understanding of seven-transmembrane receptor (7TMR) signalling has promoted the development of a new generation of pathway selective ligands. The angiotensin II type I receptor (AT1aR) is one of the most studied 7TMRs with respect to selective activation of the β-arrestin dependent signalling. Two complimentary global phosphoproteomics studies have analyzed the complex signalling induced by the AT1aR. Here we integrate the data sets from these studies and perform a joint analysis using a novel method for prediction of differential kinase activity from phosphoproteomics data. The method builds upon NetworKIN, which applies sophisticated linear motif analysis in combination with contextual network modelling to predict kinase-substrate associations with high accuracy and sensitivity. These predictions form the basis for subsequently nonparametric statistical analysis to identify likely activated kinases. This suggested that AT1aR-dependent signalling activates 48 of the 285 kinases detected in HEK293 cells. Of these, Aurora B, CLK3 and PKG1 have not previously been described in the pathway whereas others, such as PKA, PKB and PKC, are well known. In summary, we have developed a new method for kinase-centric analysis of phosphoproteomes to pinpoint differential kinase activity in large-scale data sets.
Department of Clinical Biochemistry, Glostrup Research Institute, Glostrup Hospital, Glostrup, Denmark.
Rikke
R
Bøgebo
Department of Disease Systems Biology, Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark.
Heiko
H
Horn
Department of Proteomics, Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark.
Jesper V
JV
Olsen
Department of Clinical Biochemistry, Glostrup Research Institute, Glostrup Hospital, Glostrup, Denmark.
Steen
S
Gammeltoft
Department of Disease Systems Biology, Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark.
Lars J
LJ
Jensen
Department of Biomedical Sciences and The Danish National Research Foundation Centre for Cardiac Arrhythmia, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
Jakob L
JL
Hansen
Department of Clinical Biochemistry, Glostrup Research Institute, Glostrup Hospital, Glostrup, Denmark; Cellular and Metabolic Research Section, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.
Gitte L
GL
Christensen
D030562:Databases, Protein; D057809:HEK293 Cells; D006801:Humans; D010766:Phosphorylation; D017434:Protein Structure, Tertiary; D011945:Receptors, Angiotensin / Q000378:metabolism*; D020539:Sequence Analysis, Protein; D015398:Signal Transduction / Q000502:physiology*
D011945:Receptors, Angiotensin