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J Biol Chem, Vol. 274, Issue 15, 10047-10052, April 9, 1999
From the Department of Endocrine Research, Genentech, Inc.,
South San Francisco, California 94080
As part of a program to further understand the
mechanism by which extracellular signals are coordinated and
cell-specific outcomes are generated, we have cloned a novel class of
related adaptor molecules (NSP1, NSP2, and NSP3) and have characterized in more detail one of the members, NSP1. NSP1 has an Shc-related SH2
domain and a putative proline/serine-rich SH3 interaction domain.
Treatment of cells with epidermal growth factor or insulin leads to
NSP1 phosphorylation and increased association with a hypophosphorylated adaptor protein, p130Cas. In
contrast, cell contact with fibronectin results in Cas phosphorylation and a transient dissociation of NSP1 from p130Cas.
Increased expression of NSP1 in 293 cells induces activation of JNK1,
but not of ERK2. Consistent with this observation, NSP1 increases the
activity of an AP-1-containing promoter. Thus, we have described a
novel family of adaptor proteins, one of which may be involved in the
process by which receptor tyrosine kinase and integrin receptors
control the c-Jun N-terminal kinase/stress-activated protein kinase pathway.
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