Heteropolysaccharides Based on Galactan Main-Chains

Mucoran, isolated from cell walls of Mucor rouxii, and purified by way of its insoluble, copper complex, consists principally of 

D-glucuronic acid, D-mannose, and L-fucose in the ratios of 5 3 2. Methylation data and the isolation of 3-0-a-D-(glucopyranosyluronic acid)-D-mannose show that its structure is mainly linear, with a high proportion188 of the structure D-Manp-(1— [4)-a-D-GlcpA-(l— 3)-D-Manp-(1)] . 

Many articles have appeared concerning the content and location of chitin, which is virtually universal in the cell walls of fungi. Both chi-tin (17%) and chitosan, which lacks N-acetyl groups, are present in the cell wall of Choanephora curcurbitarum.194 Chitin may be detected in bud scars, cell wall, and cytoplasm, near the plasmalemma of Sac-charomyces cerevisiae and Candida utilis, as detected by wheat-germ agglutinin.82 

Cyttaria harioti Fischer195,196 produces a polysaccharide containing D-glucose, D-arabtno-hexulosonic acid, and D-fructose in the molar ratios of 98 6 1. 

MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824  

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