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. 1987 Apr 1;243(1):145–151. doi: 10.1042/bj2430145

The invasive adenylate cyclase of Bordetella pertussis. Properties and penetration kinetics.

E Friedman, Z Farfel, E Hanski
PMCID: PMC1147825  PMID: 2886119

Abstract

Bordetella pertussis, the causative organism of whooping cough, produces a calmodulin-sensitive adenylate cyclase. Confer & Eaton [(1982) Science 217, 948-950] have shown that an extract from B. pertussis increases intracellular cyclic AMP levels in neutrophils and suggested that this increase is caused by the bacterial adenylate cyclase which penetrates these cells. We demonstrate in the present study that adenylate cyclase activity in lysates from lymphocytes exposed to a partially purified preparation of the bacterial enzyme has properties completely different from those of the intrinsic membrane-bound enzyme. Adenylate cyclase activity in lysates from lymphocytes exposed to the invasive enzyme is insensitive to N-ethylmaleimide, readily inactivated by acetic anhydride and relatively stable to SDS. Similar properties are exhibited by the bacterial enzyme itself. By contrast, the intrinsic membrane-bound enzyme activated by forskolin and guanosine 5'-gamma-thiotriphosphate is sensitive to N-ethylmaleimide and SDS and relatively stable to acetic anhydride. This strongly supports the notion that B. pertussis adenylate cyclase penetrates cells. Using the partially purified preparation of the invasive enzyme, we have studied the kinetics of its penetration. The intracellular catalytic activity reaches a steady state within 20 min, irrespective of enzyme or cell concentration. Steady-state levels are maintained for at least 2 h provided that the invasive enzyme is present in the incubation medium. Upon its removal, a rapid decrease (t1/2 approximately equal to 15 min) in the intracellular cyclase level is observed. This decrease reflects intracellular inactivation of the bacterial enzyme and is not caused by the release of the enzyme to the cell medium.

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Selected References

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