[Adenylate cyclase. A possible factor in the pathogenicity of Yersinia pestis].

Biological effect of homogenous preparation of Y. pestis adenylate cyclase on eucaryotic cells was studied. Adenylate cyclase, added (7.5 x 10(8) g/ml) to guinea pig macrophages lowers the level of chemiluminescence to 50-70%, has an appreciable cytotoxic effect on peritoneal macrophages and suppresses phosphorylation processes of leucocyte proteins from white mice. The experimental results obtained allow to suggest Y. pestis adenylate cyclase to be a pathogenic factor, contributing to the development of plague infection.