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Characterization of a high-affinity and specific binding site for Gas6
1Discovery Research Laboratories II, Shionogi & Co., Ltd., Osaka, Japan.
FEBS Letters
|May 27, 1996
Summary
Researchers identified a growth factor coded by the gas6 gene and its receptor. This study further characterized Gas6 receptor binding, revealing its presence in specific tissues and its calcium-dependent nature.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- A novel growth-potentiating factor has been purified and identified as being coded by the gas6 gene.
- The presence of a Gas6 receptor on rat vascular smooth muscle cells has been previously suggested.
Purpose of the Study:
- To further analyze the binding characteristics of Gas6 to its receptor.
- To investigate the tissue and cellular distribution of Gas6 binding sites.
- To elucidate the molecular properties of the Gas6 receptor.
Main Methods:
- Utilized (125)I-labeled Gas6 to assess binding activity across various tissues and cell types.
- Performed binding assays with HOS cells to determine the influence of Ca(2+) on Gas6 binding.
- Employed chemical cross-linking techniques to identify the molecular weight of the Gas6 receptor.
Main Results:
- Gas6 binding sites were found in a limited but diverse range of tissues and cell types.
- Specific binding of Gas6 to HOS cells was dependent on the presence of calcium ions (Ca(2+)).
- Chemical cross-linking indicated the formation of a high-molecular-mass complex, suggesting a high-molecular-weight receptor.
Conclusions:
- The Gas6 receptor is expressed in specific tissues and cell types.
- Calcium ions are crucial for the specific binding of Gas6 to its receptor.
- The Gas6 receptor is likely a high-molecular-weight protein.