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AdvanceBio Sialidase A, 1 U (formerly ProZyme). Releases α(2,3)-, α(2,6)-, α(2,8)-, and α(2,9)-linked N-acetylneuraminic acid from oligosaccharides and glycoproteins. Also capable of releasing N-glycolylneuraminic acid. Incudes 5x Reaction Buffer B [250 mM sodium phosphate pH 6.0] which when diluted gives 50 mM sodium phosphate pH 6.0.

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Enzyme Specific Activity
  • 40 units/mg
  • 200 µL
Enzyme Specificity
  • The enzyme releases a(2,3)-, a(2,6)-, a(2,8)-, and a(2,9)-linked N-acetylneuraminic acid from complex carbohydrates. The initial rate of hydrolysis of a(2,6) linkages is reported to be approximately twice that of a(2,3)-linked sialic acid however, in practice, this kinetic selectivity is of little consequence during extended incubations. Effective digestion of glycolipid substrates is facilitated by addition of a detergent, such as sodium taurodeoxycholate to the incubation. Sialidase A is capable of releasing N-glycolylneuraminic acid (Neu5Gc, NGNA) in addition to N-acetylneuraminic acid (Neu5Ac, NANA) [1], although similarly to other sialidases [2] the activity is lower toward Neu5Gc than Neu5Ac. The enzyme can also be used to remove sialic acid from gangliosides [3], glycosphingolipids (ceramide and oligosaccharide) with sialic acid. May be used for exoglycosidase sequencing with Sialidase S (GK80021), which is specific for a(2,3)-linked sialic acids. Sialidases are also known as neuraminidase.
Enzyme Unit Definition
  • One unit is defined as the amount of enzyme required to catalyze the release of 1 µmole of p-nitrophenol from p-nitrophenyl-α-D-N-acetylneuraminic acid per minute at 37° C, pH 5.5.
Enzyme Formulation
  • 20 mM Tris HCl pH 7.5, containing 25 mM NaCl.
Enzyme Source
  • Recombinant gene from Arthrobacter ureafaciens, expressed in E. coli. Sialidases are also known as neuraminidases.
  • 5 U/mL
  • 1 U
Molecular Weight
  • ~88 kD
pH Optimum
  • 6