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PURIFICATION AND ISOLATION OF A BIOLOGICALLY ACTIVE PEPTIDO‐RHAMNOGALACTAN FROM SPOROTHRIX SCHENCKII

A biologically active peptido‐rhamnogalactan was isolated from disrupted Sporothrix schenckii yeast cells by sodium deoxycholate extraction and was further purified by DEAE‐Sephadex A‐50 chromatography. This fraction, 60.6% sugar and 3.0% nitrogen, was active in delayed hypersensitivity skin tests in sporotrichosis patients and also cross‐reacted serologically with a peptido‐rhamnomannan isolated from Sporothrix schenckii culture filtrates. These results suggest strong that L‐rhamnose, α‐1, 2 linked, is more important in determining the serological specificity of Sporothrix schenckii than the α‐1, 3 linked L‐rhamnose or the mannan backbone of the peptido‐rhamnomannans so far studied by others.