A binding protein for lysosomal enzymes isolated from brain by phosphomannan-Sepharose chromatography

Keith Alvares*, A. S. Balasubramanian

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

We have isolated from monkey (Macaca radiata) brain lysosomal fraction by phosphomannan-Sepharose chromatography a protein that binds four different lysosomal enzymes, β-hexo-saminidase, β-glucuronidase, α-L-fucosidase and arylsulfatase. The isolated protein which appeared in an aggregated homogeneous form on gel electrophoresis under non-denaturing conditions at both pH 8.3 and pH 5.0 was found to be heterogeneous on SDS-gel electrophoresis with molecular weights less than 67,000. Binding was partly abolished by periodate treatment or by alkaline phosphatase treatment of the lysosomal enzymes. Binding was completely abolished by pronase digestion of the binding protein. Of the different sugars tested for inhibition of binding, mannose-6-phosphate was most effective followed by mannose and N-acetyl glucosamine while glucose and fucose were ineffective.

Original languageEnglish (US)
Pages (from-to)398-406
Number of pages9
JournalBiochemical and Biophysical Research Communications
Volume112
Issue number2
DOIs
StatePublished - Apr 29 1983

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ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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