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Eur J Biochem. 1989 May 1;181(2):345-50.

A phosphodiester bridge between two arabinose residues as a structural element of an extracellular glycoprotein of Volvox carteri.

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Lehrstuhl Biochemie I der Universität, Regensburg, Federal Republic of Germany.


The sulphated glycoprotein SSG 185 is the monomeric precursor of a highly aggregated structural element in the extracellular matrix of the multicellular green alga Volvox carteri. A phosphodiester of arabinose was isolated from a saccharide fragment of SSG 185. The structure of this phosphodiester was investigated by methylation analysis, 13C-NMR, photometric methods and enzymatic assays and identified as D-Araiota-5-phospho-5-D-Araiota. The function of this phosphodiester bridge as a crosslink of different carbohydrate chains in SSG 185 is discussed.

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