ChemInform Abstract: An Enzymatic Method for Preparation of Homopolymannuronate Blocks and Strictly Alternating Sequences of Mannuronic and Guluronic Units
Autor: | Micheline Guinand, Alain Heyraud, Frederic Chavagnat, Jean Wallach, Philippe Colin-Morel, Claude Gey |
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Rok vydání: | 2010 |
Předmět: | |
Zdroj: | ChemInform. 29 |
ISSN: | 1522-2667 0931-7597 |
Popis: | Two Pseudomonas aeruginosa alginates were lysed by an overexpressed polymannuronate lyase AlxM B (only acting on two or more consecutive, nonacetylated mannuronate units) to prepare either mannuronate blocks (poly-M blocks) with dp∼30, or strictly alternating sequences of mannuronic and guluronic acid (poly-MG blocks) with dp>20. The poly-M blocks were obtained by lysis of a P. aeruginosa polymannuronate that has 50% O-acetylation at C-2 and C-3. The poly-MG blocks were obtained from a P. aeruginosa alginate that contained both mannuronate and guluronate residues. The polysaccharide was first deacetylated and then treated with the lyase to excise the mannuronate units from the alternating-MG blocks. Both types of blocks should have potent biological effects and should provide useful specific substrates for characterisation of other alginate lyases. |
Databáze: | OpenAIRE |
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