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Updated: Jul 10, 2026
Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
[Obtaining a full-length encoding cDNA of Csk family tyrosine kinase from human lymphocytes]
Abstract:
Tyrosine kinases of Csk family play important role in the cell growth regulation and normal cell differentiation and also can participate in the process of cancer genesis as oncoproteins. The main function of these tyrosine kinases is the phosphorylation of the Src family tyrosine kinases at their carboxyl terminus, which is the basis of their activity negative regulation. The disturbance of the csk gene expression leads to the increase of the Src tyrosine kinase activity. We have cloned a full-length encoding cDNA of the tyrosine kinase csk gene of human lymphocytes. 1.6-kilobase cDNA encodes the protein, which consists of 12 exons with conserved SH2 and SH3 domains. The homology between this protein and human Csk tyrosine kinase is 99%. A full-length DNA-copy of human lymphocytes RNA can be used for the analysis of csk gene structure in normal and pathologically changed human cells.
Insights
The Csk tyrosine kinase regulates cell growth and differentiation. Cloning the human lymphocyte csk gene provides a tool for analyzing its structure in normal and cancerous cells.
Area of Science:
- Molecular Biology
- Cellular Biology
- Oncology
Background:
- Csk tyrosine kinases are crucial for cell growth, differentiation, and cancer genesis.
- They negatively regulate Src family tyrosine kinases via phosphorylation.
- Disrupted Csk gene expression elevates Src tyrosine kinase activity.
Purpose of the Study:
- To clone the full-length cDNA of the human lymphocyte tyrosine kinase csk gene.
- To characterize the cloned csk gene and its encoded protein.
- To establish a method for analyzing csk gene structure in various human cells.
Main Methods:
- Full-length cDNA cloning of the human lymphocyte csk gene.
- Sequence analysis to identify protein domains (SH2, SH3).
- Homology comparison with known human Csk tyrosine kinase.
Main Results:
- A 1.6-kilobase cDNA encoding the Csk protein was successfully cloned.
- The encoded protein comprises 12 exons and possesses conserved SH2 and SH3 domains.
- The cloned protein exhibits 99% homology to human Csk tyrosine kinase.
Conclusions:
- The cloned human lymphocyte csk cDNA provides a valuable resource for further research.
- Analysis of csk gene structure is feasible in both normal and pathologically altered human cells using this cDNA.
- This work facilitates understanding Csk's role in cell regulation and cancer.
