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A distinctive family of embryonic protein-tyrosine kinase receptors
1Department of Biology, University of California, San Diego, La Jolla 92093.
Abstract:
Two closely related protein-tyrosine kinases with the characteristics of growth factor receptors were identified by screening a chicken embryo cDNA expression library with anti-phosphotyrosine antibodies and were designated Cek2 and Cek3 (chicken embryo kinases 2 and 3). Cek2 and Cek3 are structurally related to Cek1, a chicken basic fibroblast growth factor receptor, and presumably represent receptors for basic fibroblast growth factor-related molecules. The identification of Cek2 and Cek3 establishes the existence of a family of protein-tyrosine kinases that includes Cek1 and that is likely to be implicated in the control of developmental processes. Among protein-tyrosine kinases, this family of receptors, which may include other as yet unknown members, is most closely related to the protooncogene product Ret and the platelet-derived growth factor receptor family.
Insights
Researchers identified two new chicken embryo kinases, Cek2 and Cek3, which are protein-tyrosine kinases likely functioning as growth factor receptors. These findings suggest a new family of receptors involved in developmental processes.
Area of Science:
- Molecular Biology
- Developmental Biology
- Biochemistry
Background:
- Protein-tyrosine kinases play crucial roles in cellular signaling pathways.
- Growth factor receptors are essential for regulating cell growth and differentiation.
- Chicken embryo kinases (Cek) represent a class of receptor tyrosine kinases.
Purpose of the Study:
- To identify and characterize novel protein-tyrosine kinases in chicken embryos.
- To investigate the relationship of newly identified kinases to known growth factor receptors.
- To establish the existence of a potential new family of receptor tyrosine kinases.
Main Methods:
- Screening of a chicken embryo cDNA expression library.
- Utilizing anti-phosphotyrosine antibodies for identification.
- Structural and functional relationship analysis with known kinases.
Main Results:
- Two closely related protein-tyrosine kinases, Cek2 and Cek3, were identified.
- Cek2 and Cek3 exhibit characteristics of growth factor receptors.
- These kinases are structurally related to Cek1, a basic fibroblast growth factor receptor.
Conclusions:
- The identification of Cek2 and Cek3 establishes a new family of protein-tyrosine kinases.
- This kinase family, including Cek1, is likely involved in controlling developmental processes.
- This family shows close relation to Ret and platelet-derived growth factor receptor families.