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Little is known about the molecules involved in the regulation of Pneumocystis carinii replication and development in vitro and in vivo. We describe in this report the identification of a P. carinii gene encoding the P. carinii prohibitin protein. In mammals, the prohibitin gene product has been shown to negatively regulate cell proliferation. A cDNA clone encoding the P. carinii prohibitin gene was isolated from a P. carinii cDNA library and identified on the basis of amino acid sequence homology with prohibitin from mammalian sources. Southern blot analysis confirmed that the prohibitin cDNA clone was of P. carinii origin. Western blot analysis of total P. carinii protein indicated that the prohibitin gene is transcribed and translated in vivo. The P. carinii prohibitin gene was expressed in vivo in human fibroblasts and shown to arrest the cell cycle in the G1 phase. The results obtained suggest a potential role for P. carinii prohibitin in the regulation of P. carinii proliferation and development.

Prohibitin, a putative negative control element present in Pneumocystis carinii