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Systems-wide analysis of K-Ras, Cdc42, and PAK4 signaling by quantitative phosphoproteomics.


ABSTRACT: Although K-Ras, Cdc42, and PAK4 signaling are commonly deregulated in cancer, only a few studies have sought to comprehensively examine the spectrum of phosphorylation-mediated signaling downstream of each of these key signaling nodes. In this study, we completed a label-free quantitative analysis of oncogenic K-Ras, activated Cdc42, and PAK4-mediated phosphorylation signaling, and report relative quantitation of 2152 phosphorylated peptides on 1062 proteins. We define the overlap in phosphopeptides regulated by K-Ras, Cdc42, and PAK4, and find that perturbation of these signaling components affects phosphoproteins associated with microtubule depolymerization, cytoskeletal organization, and the cell cycle. These findings provide a resource for future studies to characterize novel targets of oncogenic K-Ras signaling and validate biomarkers of PAK4 inhibition.

SUBMITTER: Gnad F 

PROVIDER: S-EPMC3734570 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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Systems-wide analysis of K-Ras, Cdc42, and PAK4 signaling by quantitative phosphoproteomics.

Gnad Florian F   Young Amy A   Zhou Wei W   Lyle Karen K   Ong Christy C CC   Stokes Matthew P MP   Silva Jeffrey C JC   Belvin Marcia M   Friedman Lori S LS   Koeppen Hartmut H   Minden Audrey A   Hoeflich Klaus P KP  

Molecular & cellular proteomics : MCP 20130422 8


Although K-Ras, Cdc42, and PAK4 signaling are commonly deregulated in cancer, only a few studies have sought to comprehensively examine the spectrum of phosphorylation-mediated signaling downstream of each of these key signaling nodes. In this study, we completed a label-free quantitative analysis of oncogenic K-Ras, activated Cdc42, and PAK4-mediated phosphorylation signaling, and report relative quantitation of 2152 phosphorylated peptides on 1062 proteins. We define the overlap in phosphopept  ...[more]

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