Specificity studies on alpha-mannosidases using oligosaccharides from mannosidosis urine as substrates

Biochim Biophys Acta. 1975 Nov 20;410(1):156-63. doi: 10.1016/0005-2744(75)90216-8.

Abstract

Oligosaccharides containing terminal non-reducing alpha(1 leads to 2)-, alpha(1 leads to 3)-, and alpha(1 leads to 6)-linked mannose residues, isolated from human and bovine mannosidosis urines were used as substrates to test the specificities of acidic alpha-mannosidases isolated from human and bovine liver. The enzymes released all the alpha-linked mannose residues from each oligosaccharide and were most effective on the smallest substrate. Enzyme A in each case was less active on the oligosaccharides than alpha-mannosidase B2, even though the apparent Km value for the substrates was the same with each enzyme. The human acidic alpha-mannosidases were also found to be more active on substrates isolated from human rather than bovine mannosidosis urine. Human alpha-mannosidase C, which has a neutral pH optimum when assayed with a synthetic substrate, did not hydrolyse any of the oligosaccharides at neutral pH, but was found to be active at an acidic pH.

MeSH terms

  • Animals
  • Carbohydrate Metabolism, Inborn Errors / urine*
  • Cattle
  • Disaccharidases / metabolism*
  • Humans
  • Hydrogen-Ion Concentration
  • Kinetics
  • Liver / enzymology
  • Mannose / metabolism*
  • Mannosidases / isolation & purification
  • Mannosidases / metabolism*
  • Oligosaccharides / urine*
  • Species Specificity

Substances

  • Oligosaccharides
  • Disaccharidases
  • Mannosidases
  • Mannose