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J Med Microbiol 55 (2006), 325-330; DOI: 10.1099/jmm.0.46111-0
© 2006 Society for General Microbiology
ISSN 0022-2615

Association between cell-bound haemolysin and cell-detaching activity of Escherichia coli isolated from children

Beata M. Sobieszczanska1, Jacek Osek2, Romuald Gryko3 and Magdalena Dobrowolska1

1 Department of Microbiology, University of Medicine, 4 Chalubinskiego Street, 50-368 Wroclaw, Poland

2 Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute, 57 Partyzantów Street, 24-100 Pulawy, Poland

3 Military Institute of Hygiene and Epidemiology, 2 Lubelska Street, 24-100 Pulawy, Poland

Correspondence
Beata M. Sobieszczanska
mapasobie{at}provider.pl

Received 6 April 2005
Accepted 23 October 2005

Haemolysin {alpha} (HlyA) produced by cell-detaching Escherichia coli, a putative new class of enteric pathogen, is considered to be the main factor responsible for detachment of cells cultured in vitro. HlyA is one of the few E. coli proteins actively secreted into the medium during exponential growth. In the present study 27 HlyA-positive E. coli isolates, randomly selected from stool specimens, produced a cell-bound haemolysin that was detectable during the exponential and stationary growth phases. The influence of both cell-free and cell-bound haemolysins of the selected isolates on cell-detaching activity of E. coli in vitro was determined. The results suggest that cell-bound haemolysin rather than cell-free HlyA was responsible for the cell-detaching activity of E. coli strains tested.






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