Abstract
The regulation of staphylococcal enterotoxin A (SEA) synthesis in a defined medium was studied using continuous culture techniques. SEA production was repressed by glucose and repression could be overcome by addition of exogenous cyclic AMP. As well as this classical catabolite repression control, addition of glucose to de-repressed steady-state cultures resulted in rapid disappearance of toxin from the medium (also mediated by loss of cyclic AMP). When the toxin dissappeared from the medium, it was taken up again by the bacteria without apparent modification.
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