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Receptor tyrosine kinase substrates: src homology domains and signal transduction
1Department of Biochemistry and Medicine (Dermatology), Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146.
Abstract:
Among the intracellular milieu of proteins are molecules with defined biochemical functions that serve as substrates for ligand-activated tyrosine kinase receptors. It seems likely that some of these substrate molecules are elements of a critical signaling pathway used by growth factors to control cell proliferation and subverted by oncogenes to deregulate this process. Although the process of cell growth and division is relatively slow compared with other hormonally regulated responses, homeostasis in a human being requires approximately 20 x 10(6) cell divisions per second for the renewal of various cell populations. This review summarizes the present understanding of tyrosine kinase substrates that seem likely to have key roles in the signal transduction pathway that regulates cell proliferation. This includes structural features of these molecules, the influence of tyrosine phosphorylation on their functions, the biological roles of these proteins, and the capacity of these substrates to associate with activated receptor tyrosine kinases.
Insights
This review explores tyrosine kinase substrates crucial for cell proliferation signaling. Understanding these proteins and their phosphorylation is key to cell growth regulation and oncogene-driven cancer development.
Area of Science:
- Molecular Biology
- Cell Signaling
- Biochemistry
Background:
- Intracellular proteins act as substrates for ligand-activated tyrosine kinase receptors.
- These substrates are integral to growth factor-mediated cell proliferation signaling pathways.
- Dysregulation of these pathways by oncogenes can lead to uncontrolled cell growth.
Purpose of the Study:
- To review current knowledge on tyrosine kinase substrates.
- To highlight their roles in the signal transduction pathway regulating cell proliferation.
- To discuss their structural features, functional changes upon phosphorylation, biological roles, and interactions with receptor tyrosine kinases.
Main Methods:
- Literature review of tyrosine kinase substrates.
- Analysis of structural and functional properties.
- Examination of biological roles and protein interactions.
Main Results:
- Identified key tyrosine kinase substrates involved in cell proliferation.
- Detailed the impact of tyrosine phosphorylation on substrate function.
- Discussed the association of substrates with activated receptor tyrosine kinases.
Conclusions:
- Tyrosine kinase substrates are critical components of cell proliferation signaling.
- Their phosphorylation and interactions are vital for regulating cell growth and division.
- Understanding these substrates offers insights into cancer development and potential therapeutic targets.