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Cloning, sequencing, and overexpression of SH2/SH3 adaptor protein Nck from mouse thymus
1Department of Life Science, Kwangju Institute of Science and Technology, Korea.
Abstract:
Nck, an oncogenic protein containing one SH2 and three SH3 domains, is a common target for phosphorylation by a variety of cell surface receptors. The absence of a recognizable catalytic domain of Nck suggests that Nck serves as a linker molecule to couple cell surface receptors to downstream effector molecules that regulate cellular responses induced by receptor activation. In this study, we isolated Nck cDNA from mouse thymus by screening a phase expression library using monoclonal antibody (mAb) B16-5 which recognizes the SH3 domain of phospholipase C-gamma 1. Nck protein was purified from an extract of the Sf9 cell that had been infected with recombinant baculovirus containing mouse Nck cDNA. The purified protein exhibited an apparent molecular mass of 47 kDa on SDS-polyacrylamide gels. Nck antibody was generated in rabbits using purified protein as an antigen. The distribution of Nck protein in rat tissues examined by immunoblots showed that Nck is expressed widely, and that brain, spleen, and tests contain more Nck than other tissues examined.
Insights
Researchers isolated and purified Nck, an oncogenic linker protein, to study its function. Nck protein is widely expressed across rat tissues, with higher concentrations found in the brain, spleen, and testes.
Area of Science:
- Molecular Biology
- Cell Signaling
Background:
- Nck is an oncogenic protein with SH2 and SH3 domains, acting as a linker molecule.
- Its structure lacks a catalytic domain, suggesting a role in coupling cell surface receptors to downstream effectors.
Purpose of the Study:
- To isolate and characterize Nck cDNA and protein.
- To generate Nck antibodies for expression analysis.
Main Methods:
- Screening a mouse thymus expression library with a specific monoclonal antibody (mAb B16-5).
- Purifying Nck protein from Sf9 cells infected with recombinant baculovirus.
- Generating rabbit polyclonal antibodies against purified Nck protein.
- Analyzing Nck protein distribution in rat tissues using immunoblots.
Main Results:
- Nck cDNA was successfully isolated from mouse thymus.
- Purified Nck protein showed an apparent molecular mass of 47 kDa.
- Nck protein is widely distributed in rat tissues.
- Higher Nck expression was observed in brain, spleen, and testes.
Conclusions:
- Nck protein plays a significant role in cellular signaling pathways.
- The widespread expression pattern suggests diverse functions across various tissues.
