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Infect Immun. 1991 March; 59(3): 781-784

Palmitoylated proteins in Ureaplasma urealyticum.

Department of Biochemistry and Microbiology, University of St. Andrews, Fife Scotland.

ABSTRACT

After incubation of Ureaplasma urealyticum serotype 8 in the presence of 3H-labeled palmitic acid, about 25 acylated proteins were detected by electrophoresis and fluorography. Of these, at least six were shown to be antigenic by immunoprecipitation of solubilized palmitate-labeled cells with a homologous polyclonal serum. These six included the serotype 8-specific surface-expressed 96-kDa antigen. After phase partition of palmitate-labeled cells with Triton X-114, all but six acylated proteins partitioned entirely into the detergent phase. The others, including the 96-kDa antigen, partitioned preferentially into the detergent phase and were apparently amphipathic. These results are consistent with the acylated proteins being mainly membrane associated.

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