Galactomannans with novel structures from the lichen Roccella decipiens Darb.
Two homogeneous galactomannan fractions were isolated from the lichen, Roccella decipiens, one (FP) containing Man and Gal in an 81:19 molar ratio and the other (RFS), having Man, Gal, and Glc in a 43:56:1 molar ratio. FP consisted of a main chain with (1-->4)-linked alpha-D-Manp units, most of which were substituted at O-2 with side chains consisting of nonreducing end-, 2-O- and 6-O-substituted alpha-Manp units. The latter appeared to be substituted by single-unit beta-D-Galf nonreducing ends. RFS contained a similar alpha-D-Manp core structure, but with side chains containing nonreducing end, 5-O-, 6-O-, and 5,6-di-O-substituted beta-D-Galf units. Such polysaccharide structures have not been previously reported.
Carbonero
Elaine R
ER
Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, UFPR, CP 19.046, CEP 81.531-990 Curitiba, PR, Brazil.
Cordeiro
Lucimara M C
LM
Mellinger
Caroline G
CG
Sassaki
Guilherme L
GL
Stocker-Wörgötter
Elfriede
E
J Gorin
Philip A
PA
Iacomini
Marcello
M
D000085:Acetates / Q000737:chemistry; D005690:Galactose / Q000031:analogs & derivatives; D008011:Lichens / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008351:Mannans / Q000737:chemistry* / Q000302:isolation & purification; D008745:Methylation; D009005:Monosaccharides / Q000737:chemistry; D013402:Sugar Alcohols / Q000737:chemistry
D000085:Acetates; D008351:Mannans; D009005:Monosaccharides; D013402:Sugar Alcohols; C012990:galactomannan; D005690:Galactose