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Applied and Environmental Microbiology, April 2001, p. 1983-1985, Vol. 67, No. 4
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.4.1983-1985.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Enhanced Acid Sensitivity of Pressure-Damaged Escherichia coli O157 Cells

Rafael Pagán,dagger Sarah Jordan, Amparo Benito, and Bernard Mackey*

Food Microbial Sciences Unit, School of Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AP, United Kingdom

Received 18 September 2000/Accepted 7 February 2001

Pressure-damaged Escherichia coli O157 cells were more acid sensitive than native cells and were impaired in pH homeostasis. However differences in acid sensitivity were not related to differences in cytoplasmic pH (pHi). Cellular beta -galactosidase was more acid labile in damaged cells. Sensitization to acid may thus involve loss of protective or repair functions.

* Corresponding author. Mailing address: Food Microbial Sciences Unit, School of Food Biosciences, University of Reading, P.O. Box 226, Whiteknights, Reading RG6 6AP, United Kingdom. Phone: 44 (0)118 935 7229. Fax: 44 (0)118 935 7222. E-mail: b.m.mackey{at}reading.ac.uk.

dagger Present address: Departamento de Produccion Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.

Applied and Environmental Microbiology, April 2001, p. 1983-1985, Vol. 67, No. 4
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.4.1983-1985.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.