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Staphylococcus aureus osmoregulation: roles for choline, glycine betaine, proline, and taurine.

Department of Biological Sciences, Illinois State University, Normal 61761.

ABSTRACT

Choline, glycine betaine, and L-proline enhanced the growth of Staphylococcus aureus at high osmolarity (i.e., they acted as osmoprotectants) on various liquid and solid defined media, while an osmoprotective effect of taurine was shown only for cells growing on high-NaCl solid medium that lacked other osmoprotectants. Potassium pool levels were high, and there was little difference in levels in cells grown at different osmolarities. Glycine betaine accumulated to high levels in osmotically stressed cells, and choline was converted to glycine betaine. Proline and taurine also accumulated in response to osmotic stress but to lower levels than glycine betaine.

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