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  • Time-resolved phosphoproteomics reveals scaffolding and catalysis-responsive patterns of SHP2-dependent signaling.

Time-resolved phosphoproteomics reveals scaffolding and catalysis-responsive patterns of SHP2-dependent signaling.

eLife (2021-03-24)
Vidyasiri Vemulapalli, Lily A Chylek, Alison Erickson, Anamarija Pfeiffer, Khal-Hentz Gabriel, Jonathan LaRochelle, Kartik Subramanian, Ruili Cao, Kimberley Stegmaier, Morvarid Mohseni, Matthew J LaMarche, Michael G Acker, Peter K Sorger, Steven P Gygi, Stephen C Blacklow
ABSTRACT

SHP2 is a protein tyrosine phosphatase that normally potentiates intracellular signaling by growth factors, antigen receptors, and some cytokines, yet is frequently mutated in human cancer. Here, we examine the role of SHP2 in the responses of breast cancer cells to EGF by monitoring phosphoproteome dynamics when SHP2 is allosterically inhibited by SHP099. The dynamics of phosphotyrosine abundance at more than 400 tyrosine residues reveal six distinct response signatures following SHP099 treatment and washout. Remarkably, in addition to newly identified substrate sites on proteins such as occludin, ARHGAP35, and PLCγ2, another class of sites shows reduced phosphotyrosine abundance upon SHP2 inhibition. Sites of decreased phospho-abundance are enriched on proteins with two nearby phosphotyrosine residues, which can be directly protected from dephosphorylation by the paired SH2 domains of SHP2 itself. These findings highlight the distinct roles of the scaffolding and catalytic activities of SHP2 in effecting a transmembrane signaling response.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-GAB1 antibody produced in rabbit, affinity isolated antibody
Sigma-Aldrich
Duolink® In Situ Detection Reagents Green
Sigma-Aldrich
Malachite Green Phosphate Assay Kit, sufficient for 2500 colorimetric tests