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PubMed · 100105

A protein-glucan intermediate during paramylon synthesis.

A D Tomos·D H Northcote
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Abstract

A sodium deoxycholate extract containing glucosyltransferase activity was obtained from a particulate preparation from Euglena gracilis. It transferred glucose from UDP-[14C]glucose into material that was precipitated by trichloroacetic acid. This material released beta-(1 leads to 3)-glucan oligosaccharides into solution on incubation with weak acid, weak alkali and beta-(1 leads to 3)-glucosidase. The products of the incubation of the deoxycholate extract with UDP-[14C]glucose were analysed by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis. Radioactive bands were obtained that had the properties of beta-(1 leads to 3)-glucan covalently linked to protein by a bond labile to weak acid. High-molecular-weight material containing a beta-(1 leads to 3)-glucan was also shown to be present by gel filtration. The bond linking glucan to aglycone is possibly a pyrophosphate linkage. It is proposed that in Euglena gracilis beta-(1 leads to 3)-glucan (paramylon) is synthesized on a protein primer.

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AnimalsChromatography, GelElectrophoresis, Polyacrylamide GelEuglena gracilisGlucansGlucosyltransferasesProtein BindingProteoglycansTrichloroacetic AcidUridine Diphosphate GlucoseJournal Article

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A D Tomos, D H Northcote. 1978-07-15. A protein-glucan intermediate during paramylon synthesis.. https://doi.org/10.1042/bj1740283

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