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Ion binding: patterns of 'affinity' depending on types of acid groups
1Department of Chemical Morphology (Cell and Structural Biology), Manchester University, UK.
Symposia of the Society for Experimental Biology
|January 1, 1989
Summary
Cation binding to polymers differs based on charge type. This study generalizes a mechanism explaining ion preferences, suggesting potassium (K+) was favored over sodium (Na+) during intracellular biosynthesis.
Area of Science:
- Biochemistry
- Polymer Science
- Physical Chemistry
Background:
- Bungenberg de Jong's early work identified differential cation binding (Na+, K+, Mg2+, Ca2+) to polyanions (carboxylate, phosphate, sulfate).
- A mechanism based on cation polarisability and anion polarising power was proposed to explain these differences.
Purpose of the Study:
- To generalize Bungenberg de Jong's mechanism for cation binding.
- To establish a relationship between anion pK and ion binding spectra.
- To investigate cation preferences of extracellular polyanions.
Main Methods:
- Generalization of a previously established mechanism for cation-anion interactions.
- Analysis of ion binding spectra in relation to anion pK values.
Main Results:
- The generalized mechanism predicts that extracellular polyanions would prefer potassium (K+) over sodium (Na+).
- This preference contrasts with the higher concentration of Na+ in extracellular environments.
Conclusions:
- The study suggests a potential role for K+ preference in intracellular biosynthesis, where K+ is the predominant intracellular cation.
- The findings offer insights into the fundamental mechanisms governing ion interactions with charged polymers in biological systems.