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The Nck SH2/SH3 adaptor protein: a regulator of multiple intracellular signal transduction events
1Massachusetts Institute of Technology, Center for Cancer Research, Cambridge 02139, USA. mccarty@mit.edu
Abstract:
The process generally termed signal transduction involves the coordinated relay of information from extracellular cues to intracellular effectors, subsequently leading to a specified cellular response. The formation of multimeric protein complexes is a critical step in the activation of most intracellular signal transduction cascades. In many cases, these processes are initiated by a family of molecules consisting of protein association motifs known as src homology 2 and 3 (SH2 and SH3) domains. This review focuses on a group of proteins within this family that lack intrinsic enzymatic functions and consist almost entirely of SH2 and SH3 domains. Termed "adaptors," these proteins serve to physically bridge activated cell surface receptors to various intracellular signal transduction pathways. Here, I briefly summarize current knowledge concerning the various adaptor proteins and place a particular emphasis on Nck. Various data are discussed which collectively support a role for Nck in the regulation of multiple intracellular signaling events.
Insights
Adaptor proteins, rich in SH2 and SH3 domains, bridge cell surface receptors to intracellular pathways. This review highlights Nck
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Signal transduction relays extracellular cues to cellular responses via protein complexes.
- Src homology 2 (SH2) and 3 (SH3) domains are key protein association motifs.
- Adaptor proteins, lacking enzymatic function, link cell surface receptors to intracellular pathways.
Purpose of the Study:
- To review adaptor proteins, focusing on their role in signal transduction.
- To emphasize the function of Nck as a critical adaptor protein.
- To discuss evidence supporting Nck's role in regulating intracellular signaling.
Main Methods:
- Literature review of adaptor proteins and their functions.
- Analysis of data supporting Nck's involvement in signaling pathways.
- Focus on proteins with SH2 and SH3 domains but no intrinsic enzymatic activity.
Main Results:
- Adaptor proteins physically connect activated receptors to downstream signaling cascades.
- Nck is identified as a key adaptor protein with a significant role in signal transduction.
- Multiple lines of evidence indicate Nck's involvement in regulating diverse intracellular signaling events.
Conclusions:
- Adaptor proteins are essential mediators in signal transduction pathways.
- Nck plays a crucial role in integrating signals from cell surface receptors.
- Further research into Nck's function can elucidate complex cellular responses.