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Cellouronic acid (CUA), (1 → 4)-β-d-polyglucuronate sodium salt, was prepared from regenerated cellulose by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation in water at pH 10. Changes in chemical structure and degree of polymerization (DP) of CUA by treatment in water under various pH and temperature conditions were studied to evaluate the stability of CUA. No depolymerization...
The crystal structure of endo-β-(1→4)-glucuronan lyase from Trichoderma reesei (TrGL) has been determined at 1.8Å resolution as the first three-dimensional structure of polysaccharide lyase (PL) family 20. TrGL has a typical β-jelly roll fold, which is similar to glycoside hydrolase family 16 and PL7 enzymes. A calcium ion is bound to the site far from the cleft and appears to contribute to the stability...
Various cellulose II samples, ball-milled native celluloses and ball-milled wood saw dust were subjected to 2,2,6,6-tetramethypyperidine-1-oxyl radical (TEMPO)-mediated oxidation to prepare cellouronic acid Na salts (CUAs). The TEMPO-oxidized products obtained were analyzed by 13C-NMR and size-exclusion chromatography (SEC). When the cellulose II samples with degrees of polymerization (DP) of 220–680...
A bacterial strain, Brevundimonas sp. SH203, has an ability to degrade cellouronate, β-(1→4)-linked polyglucuronic acid sodium salt, which is artificially prepared from regenerated cellulose by TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation. In a previous paper, an endo-type cellouronate lyase (CUL-I) has been isolated from the strain. In this paper, we purified another cellouronate...
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