Journal
JOURNAL OF MOLECULAR BIOLOGY
Volume 393, Issue 2, Pages 435-447Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2009.08.021
Keywords
lysosomal storage disease; glycoside hydrolase; glycoprotein structure; human NAGA gene; x-ray crystallography
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Funding
- National Institutes of Health [R01 DK76877]
- National Science Foundation [0654128]
- National Institute of General Medical Sciences, National Institutes of Health [GM-0080]
- Division Of Graduate Education
- Direct For Education and Human Resources [0654128] Funding Source: National Science Foundation
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alpha-N-acetylgalactosaminidase (alpha-NAGAL; E.C. 3.2.1.49) is a lysosomal exo-glycosidase that cleaves terminal alpha-N-acetylgalactosamine residues from glycopeptides and glycolipids. In humans, a deficiency of alpha-NAGAL activity results in the lysosomal storage disorders Schindler disease and Kanzaki disease. To better understand the molecular defects in the diseases, we determined the crystal structure of human alpha-NAGAL after expressing wildtype and glycosylation-deficient glycoproteins in recombinant insect cell expression systems. We measured the enzymatic parameters of our purified wild-type and mutant enzymes, establishing their enzymatic equivalence. To investigate the binding specificity and catalytic mechanism of the human alpha-NAGAL enzyme, we determined three crystallographic complexes with different catalytic products bound in the active site of the enzyme. To better understand how individual defects in the alpha-NAGAL glycoprotein lead to Schindler disease, we analyzed the effect of disease-causing mutations on the three-dimensional structure. (C) 2009 Elsevier Ltd. All rights reserved.
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