Cytoplasmic protein NCK1 (NCK1) SH3.1 domain (NCK1 SH3.1)

Cytoplasmic protein NCK1 (Nck1) is a ubiquitously expressed adaptor protein consisting of three N-terminal SH3 domains and one C-terminal SH2 domain, serving as a critical link between tyrosine kinase signaling and the actin cytoskeleton (UniProt P16333). The Nck1 SH3.1 domain, the first of these modules, specifically recognizes and binds to proline-rich motifs (PxxP) on effector proteins such as the CD3 epsilon subunit of the T-cell receptor and the Guanine Nucleotide Exchange Factor SOS (Borroto et al., 2014; PubMed 24403530). This domain is essential for T-cell activation and the regulation of actin-mediated processes including cell migration, axonal growth, and podocyte stability in the kidney (Jones et al., 2006; PubMed 16531999). In pathological contexts, Nck1 SH3.1 is implicated in cancer progression, where it facilitates invasive signaling, and in autoimmune diseases where it mediates aberrant T-cell responses (Labelle-Dumais et al., 2011; PubMed 21490053). Therapeutic strategies targeting the Nck1 SH3.1 domain, such as the small molecule AX-024, focus on disrupting these specific protein-protein interfaces to treat inflammatory and autoimmune disorders (Borroto et al., 2016; PubMed 27910800).

Other names

NCK adaptor protein 1 SH3.1 domainNck-alpha SH3.1 domainNCK1 SH3-1 domainNck1 N-terminal SH3 domainNCK1 SH3 domain 1

Inhibition of protein-protein interactions by competitively binding to the SH3.1 domain, preventing its association with proline-rich motifs (PxxP) on effector proteins such as the CD3 epsilon subunit of the T-cell receptor.