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Glycosidic bonds breakage

Mechanism, and the source of unusual KIEs. The primary 9- N KIEs for the PNP-catalyzed reactions were anomalously low compared both to calculations and other experimental leaving group primary KIEs. The expected KIE for complete A-glycoside bond breakage would be > 1.026, the KIE for inosine hydrolysis by lU-NH. Anomalously low 9- N KIEs may arise from the strong enzyme-leaving group interactions observed in cocrystal structures of PNP with substrate, product, and inhibitor complexes. For many reactions discussed in this chapter, the primary KIEs could be modeled by BOVA or quantum mechanical analyses and were apparently... [Pg.298]

The mechanism of strand breakage in hyaluronic acid must naturally involve the scission of the glycosidic bond. From product studies of the free radical... [Pg.288]

Figure 1.1 Beta-elimination at a residue of galacturonic acid methyl ester in a pectin. The reaction will not occur if the carboxyl group is free. Breakage of the glycosidic bond occurs under alkaline conditions and both fragments can be labelled with tritiated borohydride. Similar reactions occur with alkali-labile glycopeptides. Figure 1.1 Beta-elimination at a residue of galacturonic acid methyl ester in a pectin. The reaction will not occur if the carboxyl group is free. Breakage of the glycosidic bond occurs under alkaline conditions and both fragments can be labelled with tritiated borohydride. Similar reactions occur with alkali-labile glycopeptides.
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See also in sourсe #XX -- [ Pg.84 ]



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Breakage

Glycoside bonds

Glycosidic bond

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