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Clostridium perfringens  produces numerous toxins, which are responsible for severe diseases in man and animals. Delta toxin is one of the three hemolysins released by a number of  C. perfringens  type C and possibly type B strains. Delta toxin was characterized to be cytotoxic for cells expressing the ganglioside G M2  in their membrane. Here we report the genetic characterization of Delta toxin and its pore forming activity in lipid bilayers. Delta toxin consists of 318 amino acids, its 28 N-terminal amino acids corresponding to a signal peptide. The secreted Delta toxin (290 amino acids; 32619 Da) is a basic protein (pI 9.1) which shows a significant homology with  C. perfringens  Beta toxin (43% identity), with  C. perfringens  NetB (40% identity) and, to a lesser extent, with  Staphylococcus aureus  alpha toxin and leukotoxins. Recombinant Delta toxin showed a preference for binding to G M2 , in contrast to Beta toxin, which did not bind to gangliosides. It is hemolytic for sheep red blood cells and cytotoxic for HeLa cells. In artificial diphytanoyl phosphatidylcholine membranes, Delta and Beta toxin formed channels. Conductance of the channels formed by Delta toxin, with a value of about 100 pS to more than 1 nS in 1 M KCl and a membrane potential of 20 mV, was higher than those formed by Beta toxin and their distribution was broader. The results of zero-current membrane potential measurements and single channel experiments suggest that Delta toxin forms slightly anion-selective channels, whereas the Beta toxin channels showed a preference for cations under the same conditions.  C. perfringens  Delta toxin shows a significant sequence homolgy with  C. perfringens  Beta and NetB toxins, as well as with  S. aureus  alpha hemolysin and leukotoxins, but exhibits different channel properties in lipid bilayers. In contrast to Beta toxin, Delta toxin recognizes G M2  as receptor and forms anion-selective channels.

Clostridium perfringens Delta Toxin Is Sequence Related to Beta Toxin, NetB, and Staphylococcus Pore-Forming Toxins, but Shows Functional Differences