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Biochemical and structural insights into an allelic variant causing the lysosomal storage disorder - aspartylglucosaminuria.

FEBS Lett. 2018 Aug;592(15):2550-2561. doi:10.1002/1873-3468.13190. Epub 2018 Jul 23
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摘要


Aspartylglucosaminuria (AGU) is a lysosomal storage disorder caused by defects of the hydrolase glycosylasparaginase (GA). Previously, we showed that a Canadian AGU mutation disrupts an obligatory intramolecular autoprocessing with the enzyme trapped as an inactive precursor. Here, we report biochemical and structural characterizations of a model enzyme corresponding to a Finnish AGU allele, the T234I variant. Unlike the Canadian counterpart, the Finnish variant is capable of a slow autoprocessing to generate detectible hydrolyzation activity of the natural substrate of GA. We have determined a 1.6 Å-resolution structure of the Finnish AGU model and built an enzyme-substrate complex to provide a structural basis for analyzing the negative effects of the point mutation on KM and kcat of the mature enzyme. ENZYME:Glycosylasparaginase or aspartylglucosaminidase, EC3.5.1.26.

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