Pertussis toxin (PT) B B B Receptor 1 The B subunits of pertussis toxin bind to receptors on the Host cell host cell surface. The A subunit is transferred into the surface Regulatory protein host cell, becoming a functional enzyme on entry. B B B в G 2 Regulatory protein G is inactivated by enzyme A, causing an increase in CAMP production. Enzyme A FIGURE 21.16 Mode of Action of Pertussis Toxin (PT)

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