A Cell Wall Proteo-Heteroglycan from Piricularia oryzae: Further Studies of the Structure

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Abstract
The carbohydrate part of a proteo-heteroglycan from Piricularia oryzae was further studied by chemical and immunological methods. Acetolysis studies of the proteo-heteroglycan and exo-α-D-mannanase resistant core showed a (1→6) mannan back-bone structure with side chains composed of one to four mannose units, and some of which are terminated by D-glucose or D-galactofuranose. The mode of attachment of the terminal glucose was characterized to be αGlc(1→6)Man by inhibition reaction with oligosaccharides. Rabbit antiserum formed against P. oryzae cells had three specificities, the first one for αGlc(1→6)αman-nosyl, the second one for αMan(1→3)αmannosyl, and the last one for αGal-f(1→2}αmannosyl residues. The most immunodominant side chain structure of the P. oryzae heteroglycan was shown to be αGlc(1→6)αMan(1→2)

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