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- W2088882309 abstract "The schema of Ebert and Patat for enzymic polysaccharide synthesis from sucrose, by anhydroglycose insertion at the reducing end of the growing chain, cannot be supported. Basically it presents a propagation direction opposite to that expected from the process that can be considered the mode of all carbohydrase action, i.e., transglycosylation or glycosyl–hydrogen interchange. Direct examination by pulse labeling shows that the latest glucose units added during amylopolysaccharide formation from sucrose by amylosucrase are, in fact, located in the outer nonreducing chains. The insertion schema further assumes that segmer transfer is a capacity of the sucrose polymerizing enzymes. Evidence of this is lacking. Dimer transfer is not observed when the theoretically appropriate trisaccharides (maltosyl- or isomaltosyl-β-D-fructofuranoside, levanbiosyl-α-D-glucopyranoside) are incubated respectively with amylosucrase, dextransucrase, or levansucrase. Moreover, the dextranyl moiety of low molecular weight sucrose-ended dextran (dextranyl-β-D-fructofuranoside) is neither polymerized by dextransucrase nor transferred to the anomeric OH of fructose, in contrast to the glucosyl moiety linked similarly. The insertion schema, finally, restricts the number of propagation sites to one per polymer molecule. This also lacks an experimental basis. The transglycosylation model allows for the possible occurrence of multiple foci of propagative activity in individual molecules, which may account for their extremely rapid growth to a high degree of polymerization." @default.
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- W2088882309 date "2007-03-08" @default.
- W2088882309 modified "2023-10-14" @default.
- W2088882309 title "The direction of propagation in carbohydrase-catalyzed polymerizations" @default.
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- W2088882309 doi "https://doi.org/10.1002/polc.5070230130" @default.
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