Protein Domain : Nck2, SH3 domain 1 IPR035559

Type	Domain
Description	This entry represent the first SH3 domain of Nck2. It binds the PxxDY sequence in the CD3e cytoplasmic tail; this binding inhibits phosphorylation by Src kinases, resulting in the downregulation of TCR surface expression [ ]. Nck2 (also known as Grb4) is a member of the Nck family. It plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling [ ]. It binds neuronal signaling proteins such as ephrinB []. Cytoplasmic proteins Nck are non-enzymatic adaptor proteins composed of three SH3 (Src homology 3) domains and a C-terminal SH2 domain []. They regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates []. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics []. They associate with tyrosine-phosphorylated growth factor receptors or their cellular substrates [, ]. There are two vertebrate Nck proteins, Nck1 and Nck2.
Short Name	Nck2_SH3_1