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Mucopolysaccharidosis type VII is a lysosomal storage disease resulting from a deficiency of beta-glucuronidase (BG) activity. To facilitate the investigation of mutation in the disease and provide molecular diagnostic tools for affected families, we have isolated human BG cDNA clones. The SV40-transformed human fibroblast cDNA library of Okayama and Berg [Mol. Cell. Biol. 3 (1982) 280-289] was screened with a fragment of a murine BG cDNA clone (pGUS-1). The 17 human cDNA clones (pHUG) isolated were identical by restriction mapping, varying only in length. The pHUG clones show 80% DNA sequence homology with pGUS-1 in a 198-bp PvuII-SstI restriction fragment. Both pGUS-1 and the pHUG clones contained an open reading frame (ORF) throughout the sequenced region with a predicted amino acid sequence homology of 73%. Expression in Escherichia coli of a 1150-bp fragment of pHUG-1 subcloned in pUC9 resulted in an isopropyl-thio-beta-galactoside (IPTG)-inducible 35-kDal fusion protein which was specifically immunoprecipitated by goat anti-human BG immunoglobulin G (IgG). This evidence provides direct confirmation that the pHUG cDNA clones correspond to human BG.
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R Palmer, and
R E Ganschow, and
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R A Gravel
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June 2001,
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November 1985,
Proceedings of the National Academy of Sciences of the United States of America,
K S Guise, and
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