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Counter-ion binding to mucus glycoproteins
The Journal of Pharmacy and Pharmacology
|January 1, 1984
Summary
Pig gastric mucus glycoprotein binds strongly to highly charged ions, with binding affinity influenced by ion valency but not radius. Calcium binding is sensitive to pH and ionic strength.
Area of Science:
- Biochemistry
- Glycoprotein chemistry
Background:
- Gastric mucus glycoproteins play a crucial role in protecting the stomach lining.
- Understanding the interaction of these glycoproteins with ions is important for elucidating physiological and pathological processes.
Purpose of the Study:
- To investigate the binding affinity of pig gastric mucus glycoprotein for counter ions of varying valencies.
- To determine the influence of ionic properties such as valency and radius on this binding.
Main Methods:
- Affinity studies were conducted using pig gastric mucus glycoprotein and various counter ions.
- The effect of ionic strength, pH, and enzymatic removal of sialic acid on calcium binding was assessed.
Main Results:
- Glycoprotein affinity increased with higher ion valency (Fe3+ > Al3+ > Ca2+ > Cs+ ≈ Na+).
- Ionic radius did not significantly affect the degree of binding.
- Calcium binding was inhibited by high ionic strength and pH variations.
- Enzymatic removal of sialic acid resulted in a slight decrease in calcium binding capacity.
Conclusions:
- Pig gastric mucus glycoprotein exhibits selective binding of counter ions, primarily driven by ion valency.
- The binding characteristics are modulated by environmental factors like ionic strength and pH, and by the presence of sialic acid.