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[Electrokinetic properties of Staphylococcus aureus cells]
Zhurnal Mikrobiologii, Epidemiologii I Immunobiologii
|April 1, 1982
Summary
Different Staphylococcus aureus strains exhibit similar pH-dependent electrophoretic mobility curves, with charge primarily determined by teichoic acid in their cell walls. This finding aids in understanding bacterial surface properties.
Area of Science:
- Microbiology
- Biophysics
- Surface Chemistry
Background:
- Staphylococcus aureus is a significant human pathogen.
- Understanding bacterial cell surface properties is crucial for diagnostics and therapeutics.
- Electrophoretic mobility is a key indicator of cell surface charge.
Purpose of the Study:
- To characterize the pH-dependent electrophoretic mobility of Staphylococcus aureus cells.
- To identify the components responsible for the surface charge of St. aureus.
Main Methods:
- Electrophoretic mobility measurements across a range of pH values.
- Analysis of the sigmoidal shape of mobility curves.
- Correlation of charge characteristics with cell wall composition.
Main Results:
- St. aureus cells from various strains showed similar asygmoid pH-dependent electrophoretic mobility curves.
- The peaks of these curves consistently appeared between pH 3.0 and 5.0.
- Phosphoric acid groups of teichoic acid were identified as the primary contributors to the surface charge in this pH range.
Conclusions:
- The electrophoretic mobility of St. aureus is governed by the electrostatic charge distributed throughout the cell wall.
- Teichoic acid plays a critical role in determining the surface charge characteristics of St. aureus.
- These findings provide insights into the biophysical properties of St. aureus cell surfaces.