Serological Specificity and Antigenic Determinants of Saccharomyces cerevisiae Cell-wall Mannans.

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We have established an antigenic formula for two serotypes and three subtypes of Saccharomyces cerevisiae by agglutination system with adsorption experiments. This antigenic formulation identifies five distinct antigenic factors or determinants that are found on various serotypes of S. cerevisiae. Serotype Ia and Ib have antigenic factors 1, 10, 18 and 18a and 1, 10, 18 and p, respectively. Serotype Iab has both antigenic factors 18a and p in addition to the common antigenic factors 1, 10 and 18. Serotype II has only the common antigenic factors 1 and 10. 1H-n. m. r. spectrum (H-1 region) of the mannan of serotype Ia, almost free from phosphate, was characterized by the signal at δ5.127 which corresponded to the H-1 of 3-O-substituted α-D-Manp residue adjacent to terminal α (1-3) linkage of mannopentaose side chain, for the specific determinant of antigenic factor 18a. In contrast, phosphodiester mannan from serotype Ib released mannose and α-(1-3)-linked mannobiose by mild acid hydrolysis. The signals at δ5.422-5.461 and 5.284 disappeared, and the signal at δ5.160 was diminished in phosphomonoester mannan treated by mild acid hydrolysis. An immunochemical characterization of the antigenic factor p using agglutination inhibition test between factor p serum and serotype Ib cell ssuggests that the α-(1-3)-linked mannobiosyl-1-phosphate group is a part of the antigenic determinant for the factor p.
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