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A fungus-type beta-galactofuranan in the cultivated Trebouxia photobiont of the lichen Ramalina gracilis.

Abstract：

:A structural characterization of polysaccharides extracted from the aposymbiotically cultured photobiont of the lichen Ramalina gracilis was carried out in order to compare them with those previously found in the symbiotic thallus. The photobiont was isolated from thallus fragments, following the method of Yamamoto, and cultivated in a liquid nutrient medium. Freeze-dried cells were defatted, and the polysaccharides extracted successively with water and aq. 10% KOH, each at 100 degrees C. After purification, the soluble fractions provided a polysaccharide containing a (1-->5)-linked beta-galactofuranosyl backbone, substituted in a small proportion at O-6 by beta-Galf units. Amylose was also found, as insoluble material obtained on freeze-thawing of the alkaline extract. These polysaccharides have not been found in the symbiotic thallus of Ramalina gracilis, which contained only water-soluble (isolichenan) and insoluble glucans (nigeran and laminaran), and galactomannan. Surprisingly, the galactofuranan has similarities with those found in some fungal cell walls.

journal_name

FEMS Microbiol Lett

journal_title

FEMS microbiology letters

authors

Cordeiro LM,Carbonero ER,Sassaki GL,Reis RA,Stocker-Wörgötter E,Gorin PA,Iacomini M

doi

10.1016/j.femsle.2005.01.040

keywords:

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

193-8

issue

1

eissn

0378-1097

issn

1574-6968

pii

S0378-1097(05)00066-2

journal_volume

244

pub_type

杂志文章

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