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. 1982 May 15;204(2):557–563. doi: 10.1042/bj2040557

A study of highly purified mucolipidosis III urinary N-acetyl-beta-D-hexosaminidase B.

S Hirani, L Little, A L Miller
PMCID: PMC1158385  PMID: 7115350

Abstract

Highly purified N-acetyl-beta-D-hexosaminidase B from normal urine and urine of a patient with mucolipidosis III was used to determine whether it has undergone any of the alterations associated with this genetic defect. Examination by sodium dodecyl sulphate/polyacrylamide gel electrophoresis showed that both the enzyme preparations contained protein components with apparent Mr values of 55 000 and 28 000. No differences in the binding and apparent KI (50%) to concanavalin A of the normal and mucolipidosis III enzymes were detected. However, the patient's N-acetyl-beta-D-hexosaminidase B had a slightly greater affinity for the lectin from Ricinus communis than did the normal enzyme. Two-dimensional tryptic peptide maps of the corresponding normal and the patient's N-acetyl-beta-D-hexosaminidase B subunits showed considerable homology. These results indicate that N-acetyl-beta-D-hexosaminidase b does not undergo the significant carbohydrate alterations characteristic of other acid hydrolases in mucolipidosis III.

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Selected References

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