ABSTRACTOrganisms in the genus Pneumocystisare ubiquitous, opportunistic pathogenic fungi capable of causing a lethal pneumonia in immunocompromised mammalian hosts. Pneumocystisspp. are unique members of the fungal kingdom due to the absence of ergosterol in their cellular membranes. Although these organisms were thought to obtain cholesterol by scavenging, transcriptional analyses indicate that Pneumocystis cariniiencodes gene homologs involved in sterol biosynthesis. To better understand the sterol pathway in these uncultivable fungi, yeast deletion strains were used to interrogate the function and localization of P. cariniilanosterol synthase (ERG7). The expression of PcErg7p in an ERG7-null mutant of the yeast Saccharomyces cerevisiaedid not alter its growth rate and produced a functional lanosterol synthase, as evidenced by the presence of lanosterol detected by gas chromatographic analysis in levels comparable to that produced by the yeast enzyme. Western blotting and fluorescence microscopy revealed that, like the S. cerevisiaeErg7p, the PcErg7p localized to lipid particles in yeast. Using fluorescence microscopy, we show for the first time the presence of apparent lipid particles in P. cariniiand the localization of PcErg7p to lipid particles in P. carinii. The detection of lipid particles in P. cariniiand their association with PcErg7p therein provide strong evidence that the enzyme serves a similar function in P. carinii. Moreover, the yeast heterologous system should be a useful tool for further analysis of the P. cariniisterol pathway.