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3.2.1.18: exo-alpha-sialidase

This is an abbreviated version!
For detailed information about exo-alpha-sialidase, go to the full flat file.

Word Map on EC 3.2.1.18

Reaction

colominic acid
+
H2O
=
sialic acid
 +
lactose

Synonyms

acetylneuraminidase, Acetylneuraminyl hydrolase, acid sialidase, acylneuraminyl glycohydrolase, alpha-N-acylneuraminate glycohydrolase, alpha-neuraminidase, alpha-sialidase, alpha2,6-sialidase, alpha2,6-sialyltransferase, alpha2,6-trans-sialidase, Am0705, Am0707, Am1757, Am2085, Cytosolic sialidase, DELTA15Pd2,6ST, endo-N, endo-N-acylneuraminidase, endo-sialidase, endoNF, endosialidase, exo-alpha-sialidase, exo-sialidase, G9 sialidase, Ganglioside sialidase, ganglioside-specific sialidase, GH33C, glycosyl hydrolase, haemagglutinin-neuraminidase protein, hemagglutinin-neuraminidase, hemagglutinin-neuraminidase glycoprotein, HN, HsNEU2, IID sialidase, KDNase, Lysosomal sialidase, Major 85 kDa surface antigen, Major surface antigen, Membrane sialidase, MmNEU3, More, Mouse skeletal muscle sialidase, MSS, MTS, mucopolysaccharide N-acetylneuraminylhydrolase, Murine thymic sialidase, N-acetyl-alpha-neuraminidase, N-acetyl-alpha-neuraminidase 1, N-acetyl-alpha-neuraminidase 2, N-acetyl-alpha-neuraminidase 3, N-acetyl-alpha-neuraminidase 4, N-acetylneuraminosyl glycohydrolase, N-acylneuraminate glycohydrolase, N-acylneuraminosyl glycohydrolase, NA, NA1, NA2, NAN1, NanA, NANase, NanB, NanC, NanH, NanI, NanICD, NanJ, NanPs, Neu, NEU1, NEU2, Neu3, Neu3a, Neu3d, Neu3e, NEU4, NEU4 long, NEU4 short, NEU4L, Neu4L sialidase, neuramindase, neuraminidase, neuraminidase 1, neuraminidase 2, neuraminidase 3, neuraminidase-1, PA2794, SA85-1.1 protein, SA85-1.2 protein, SA85-1.3 protein, SiaBb1, sialidase, sialidase 4, sialidase II, sialidase Neu2, sialidase-2, sialidase-3, sialidase-4, sialidase/neuraminidase mutant F129A, sialyl hydrolase, STNA, TcTS, TDE0471, Tr6, trans-sialidase, trans-sialidase 1, TSia, VCNA

ECTree

     3 Hydrolases
         3.2 Glycosylases
             3.2.1 Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds
                3.2.1.18 exo-alpha-sialidase

pH Range

pH Range on EC 3.2.1.18 - exo-alpha-sialidase

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pH RANGE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
3 - 5.8
-
-
3 - 6
3.5 - 5
-
pH 3.5: about 30% of maximal activity, pH 5.0: about 60% of maximal activity
3.5 - 6.5
-
pH 3.5: about 55% of maximal activity, pH 6.5: about 55% of maximal activity, sialidase isoenzyme NA2
4 - 6
-
-
4 - 8.5
-
complete cessation of activity at pH 4 and 8.5
4 - 9
4.5 - 6
4.5 - 6.5
-
activity range, almost inactive at pH 4.0 and pH 7.0
4.5 - 7.5
-
-
6 - 8
more than 70% of activity is maintained from pH 6.0 to 8.0
8
L0N7M7
the enzyme shows broad pH specificity of sialidase activity even at neutral and alkaline pH with 30% activity remaining at pH 8.0
9
-
at pH 9.0, the activity of all three sialidase isoforms has decreased by about 50%