PMID: 6419541Oct 1, 1983

Ion interactions in the aggregation of Streptococcus mitis

Acta Pathologica, Microbiologica, Et Immunologica Scandinavica. Section B, Microbiology
S Abaas, T Holme

Abstract

Spontaneous aggregation of Streptococcus mitis ATCC 903 was highly dependent on various electrolytes such as sodium chloride, sodium phosphate or potassium phosphate with an optimum at 10 mM concentration. No aggregation was obtained in distilled water. Addition of a number of mono- or divalent ions to bacteria incubated in 10 mM phosphate or tris-maleate buffers resulted in an inhibition of aggregation. A 50% inhibition of aggregation was obtained at low concentrations of calcium, magnesium, sulphate and carbonate ions. Other mono- and divalent ions tested were needed in significantly higher concentrations in order to obtain the same inhibition. Aggregation inhibition by calcium or magnesium salts was reversed by chelation with EDTA. Washing bacteria previously treated with magnesium or calcium salts resulted in a complete recovery of aggregating ability. Spontaneously aggregated cells were completely dissociated at 10 mM magnesium sulphate or 100 mM sodium chloride. The results indicate that electrostatic interactions are of major importance for aggregation of S. mitis ATCC 903 whereas hydrophobic interaction plays a minor role.

References

Jan 1, 1977·Archives of Oral Biology·R G SchamschulaD E Barmes
Mar 1, 1978·Journal of Dental Research·R G SchamschulaG Charlton
Jan 1, 1979·Archives of Oral Biology·B MelsenT Karring
Jan 1, 1977·Acta Odontologica Scandinavica·B SvantunG Rolla
Jan 1, 1975·Annual Review of Microbiology·R J Gibbons, J V Houte
Jun 1, 1973·Journal of Periodontology·R J Gibbons, J van Houte

Related Concepts

Calcium
Dental Plaque
Edetic Acid, Sodium Salt
Electrolytes
Magnesium
Potassium
Sodium
Streptococcus

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