Molecular biology of the pore-forming cytolysins from Staphylococcus aureus, alpha- and gamma-hemolysins and leukocidin.
Staphylococcus aureus is an important opportunistic pathogen. It produces a variety of extracellular proteins, which may play important roles in infections by this bacterium. Staphylococcal alpha-toxin is a pore-forming 33-kDa polypeptide. In the first part of this article, we will refer to the roles of cell membranes in the pore formation by alpha-toxin as well as the molecular dissection of alpha-toxin for understanding its pore-forming nature. Staphylococcal gamma-hemolysin and leukocidin are bi-component cytolysins, which have different cell specificities towards erythrocytes and leukocytes, respectively. We have found that these bi-component cytolysins share a common component. In the second part of this article, we will refer to the current status of knowledge of molecular cloning of the genes coding for gamma-hemolysin and leukocidin, molecular domains of the toxins which decide the cell specificities, and mode of action of these bi-component toxins.
Tomita
T
T
Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University, Sendai, Japan.
Kamio
Y
Y
D000595:Amino Acid Sequence; D002462:Cell Membrane / Q000378:metabolism; D003001:Cloning, Molecular; D003603:Cytotoxins / Q000235:genetics*; D006460:Hemolysin Proteins / Q000235:genetics*; D007956:Leukocidins / Q000235:genetics*; D008969:Molecular Sequence Data; D013211:Staphylococcus aureus / Q000235:genetics*
D003603:Cytotoxins; D006460:Hemolysin Proteins; D007956:Leukocidins