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2017 ; 7
(1
): 11514
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MPZL1 forms a signalling complex with GRB2 adaptor and PTPN11 phosphatase in
HER2-positive breast cancer cells
#MMPMID28912526
Beigbeder A
; Chartier FJM
; Bisson N
Sci Rep
2017[Sep]; 7
(1
): 11514
PMID28912526
show ga
HER2/ErbB2 is overexpressed in a significant fraction of breast tumours and is
associated with a poor prognosis. The adaptor protein GRB2 interacts directly
with activated HER2 and is sufficient to transmit oncogenic signals. However, the
consequence of HER2 activation on global GRB2 signalling networks is poorly
characterized. We performed GRB2 affinity purification combined with mass
spectrometry analysis of associated proteins in a HER2+ breast cancer model to
delineate GRB2-nucleated protein interaction networks. We report the
identification of the transmembrane protein MPZL1 as a new GRB2-associated
protein. Our data show that the PTPN11 tyrosine phosphatase acts as a scaffold to
bridge the association between GRB2 and MPZL1 in a phosphotyrosine-dependent
manner. We further demonstrate that the formation of this MPZL1-PTPN11-GRB2
complex is triggered by cell attachment to fibronectin. Thus, our data support
the importance of this new signalling complex in the control of cell adhesion of
HER2+ breast cancer cells, a key feature of the metastatic process.