title: The occurrence of cell-associated enterotoxin B in Staphylococcus aureus.
abstract: Cell-associated enterotoxin B was detected in lysates of cells of Staphylococcus aureus S-6 and 4916 disrupted by sonication or lysostaphin treatment. As much as 67% of this total cell-associated toxin was surface-bound, located outside the cytoplasmic membrane, and was released during protoplasting of this organism by lysostaphin treatment in hypertonic medium. The remainder of the cell-associated toxin was termed cytoplasmic and was released during osmotic lysis of the protoplasts. Levels of cell-associated toxin as a function of the age of the cells showed a rapid increase in both surface-bound, cytoplasmic, and total cell-associated toxin levels during the period of active toxin synthesis (late exponential phase of growth). These cell-associated toxin levels then reached a peak as the culture entered stationary phase, at a time corresponding to a decrease in the rate of toxin synthesis, and decreased slowly thereafter.
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D004768:Enterotoxins / Q000096:biosynthesis* / Q000302:isolation & purification; D008248:Lysostaphin / Q000494:pharmacology; D011523:Protoplasts / Q000378:metabolism; D013010:Sonication; D013211:Staphylococcus aureus / Q000032:analysis / Q000378:metabolism*
chemical_list: D004768:Enterotoxins; D008248:Lysostaphin