Structural characterization of bioengineered α-D-glucans produced by mutant glucansucrase GTF180 enzymes of lactobacillus reuteri strain 180
article
Mutagenesis of specific amino acid residues of the glucansucrase (GTF180) enzyme from Lactobacillus reuteri strain 180 yielded 12 mutant enzymes that produced modified exopolysaccharides (mEPSs) from sucrose. Ethanol-precipitated and purified mEPSs were subjected to linkage analysis, Smith degradation analysis, and 1D/2D <sup>1</sup>H NMR spectroscopy. Comparison of the results with structural data of the previously described wild type EPS180 and triple mutant mEPS-PNNS revealed a broad variation of structural elements between mEPS molecules. The amount of (α1→3) linkages varied from 14-43%, the amount of (α1→4) linkages (not present in the wild type) from 0-12%, and the amount of (α1→6) linkages from 51-86%. The average molecular weight (M<sub>w</sub>) ranged from 9.4 to 32.3 MDa and the degree of branching varied from 8-20%. Using a previously established <sup>1</sup>H NMR structural-reporter-group concept, composite models, that include all identified structural features, were formulated for all mEPS molecules. Variations in the mEPS structures strongly affected the physical properties of the mEPSs. © 2009 American Chemical Society.
Topics
Amino acid residuesAverage molecular weightsComposite modelsDegree of branchingExopolysaccharidesGlucansGlucansucraseH nmr spectroscopiesLactobacillus reuteriLinkage analysisMutant enzymesSmith degradationsStructural characterizationsStructural datumStructural elementsStructural featuresTriple mutantsWild typesAminesAmino acidsCatalystsChainsEthanolNuclear magnetic resonanceNuclear magnetic resonance spectroscopyOrganic acidsPolysaccharidesSugar (sucrose)Enzymes
TNO Identifier
279997
ISSN
15257797
Source
Biomacromolecules, 10(3), pp. 580-588.
Pages
580-588
Files
To receive the publication files, please send an e-mail request to TNO Repository.