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Proc Natl Acad Sci U S A. Mar 1986; 83(6): 1660–1664.
PMCID: PMC323143

Human acid beta-glucosidase: isolation and amino acid sequence of a peptide containing the catalytic site.

Abstract

Human acid beta-glucosidase (D-glucosyl-N-acylsphingosine glucohydrolase, EC 3.2.1.45) cleaves the glucosidic bonds of glucosylceramide and synthetic beta-glucosides. The deficient activity of this hydrolase is the enzymatic defect in the subtypes and variants of Gaucher disease, the most prevalent lysosomal storage disease. To isolate and characterize the catalytic site of the normal enzyme, brominated 3H-labeled conduritol B epoxide (3H-Br-CBE), which inhibits the enzyme by binding covalently to this site, was used as an affinity label. Under optimal conditions 1 mol of 3H-Br-CBE bound to 1 mol of pure enzyme protein, indicating the presence of a single catalytic site per enzyme subunit. After V8 protease digestion of the 3H-Br-CBE-labeled homogeneous enzyme, three radiolabeled peptides, designated peptide A, B, or C, were resolved by reverse-phase HPLC. The partial amino acid sequence (37 residues) of peptide A (Mr, 5000) was determined. The sequence of this peptide, which contained the catalytic site, had exact homology to the sequence near the carboxyl terminus of the protein, as predicted from the nucleotide sequence of the full-length cDNA encoding acid beta-glucosidase.

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Selected References

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