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pubmed-article:8412007pubmed:abstractTextBoth the alpha- and beta-anomers of 4-methylumbelliferyl-D-glucosaminide were synthesized and shown to be substrates for the lysosomal acetyl-CoA:glucosaminide N-acetyltransferase. Using the beta-anomer, fibroblasts and leukocytes from 11 different Sanfilippo C patients showed < 1% of mean normal N-acetyltransferase activity. Heterozygotes showed intermediate activities. The enzymatic liberation of the fluorochrome from 4-methylumbelliferyl-beta-D-glucosaminide requires the sequential action of the N-acetyltransferase and beta-hexosaminidase. Normal beta-hexosaminidase activity caused complete hydrolysis of the reaction intermediate 4-methylumbelliferyl-beta-D-N-acetylglucosaminide formed by the N-acetyltransferase. In cell extracts with a beta-hexosaminidase deficiency, however, a second incubation in the presence of excess beta-hexosaminidase is needed to avoid underestimation of the N-acetyltransferase activity.lld:pubmed
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pubmed-article:8412007pubmed:articleTitleA fluorimetric enzyme assay for the diagnosis of Sanfilippo disease C (MPS III C).lld:pubmed
pubmed-article:8412007pubmed:affiliationInstitute of Biochemistry, Academy of Sciences Armenian Republic, Yerevan.lld:pubmed
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