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NSP1 defines a novel family of adaptor proteins linking integrin and tyrosine kinase receptors to the c-Jun N-terminal kinase/stress-activated protein kinase signaling pathway.

Authors:
Lu Y, Brush J, Stewart TA
Affiliation:
Journal:
The Journal of biological chemistry

Abstract

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, p130(Cas). In contrast, cell contact with fibronectin results in Cas phosphorylation and a transient dissociation of NSP1 from p130(Cas). 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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