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. 1990 Jun;58(6):1951–1958. doi: 10.1128/iai.58.6.1951-1958.1990

Calcium is required for binding of Escherichia coli hemolysin (HlyA) to erythrocyte membranes.

D F Boehm 1, R A Welch 1, I S Snyder 1
PMCID: PMC258749  PMID: 2187814

Abstract

The calcium requirement for hemolytic activity of Escherichia coli hemolysin was investigated by using hemolytic assays and immunoblotting of toxin-treated erythrocytes. The hemolytic activity of cell culture supernatants obtained during growth of E. coli in Luria-Bertani (LB) broth or calcium-free LB broth was calcium dependent. The hemolytic activity of culture supernatants obtained during growth in LB broth supplemented with calcium was calcium independent. Osmotic protection experiments using Dextran 4 to prevent cell lysis indicated that calcium was required for the binding of hemolysin to erythrocytes at both 4 and 37 degrees C. The binding efficiency at 4 degrees C was 50% of that occurring at 37 degrees C. The calcium-dependent binding was confirmed by immunoblotting saline-washed, toxin-treated erythrocytes with a monoclonal antibody after sodium dodecyl sulfate-polyacrylamide gel electrophoresis separation of membrane proteins. Bound hemolysin increased the calcium permeability of the cell membranes as evidenced by calcium-induced membrane protein alterations. The alterations in membrane proteins did not directly cause lysis of the cells. The results were consistent with a mechanism of lysis involving the formation of cation-selective pores in the membranes of target cells.

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Selected References

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