Modification of pigmentation and cell-wall structure of Rhodotorula aurantiaca by culture in the presence of sulfur amino acids

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Abstract
Growth of Rhodotorula aurantiaca in a medium supplemented with sulfur amino acids led to the synthesis and accumulation of S-adenosylmethionine, which was accompanied by a reduction in the total contents of carotenoid pigments and an increased sensitivity of the cell walls to snail gut enzymes (Helix pomatia) as judged by spheroplast formation. Walls isolated from supplemented cultures contained increased amounts of lipid and mannan but had a reduced content of protein and alkali-insoluble carbohydrate. The chemical modifications of the cell wall, which resulted as an indirect consequence of excessive S-adenosylmethionine synthesis, are interpreted to explain the ease with which sulfur amino acid-supplemented cultures of R. aurantiaca are converted to spheroplasts as well as their tendency to aggregate.

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