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MetaCyc Reaction: 3.2.1.103

Superclasses: Reactions Classified By Conversion TypeSimple ReactionsChemical Reactions
Reactions Classified By SubstrateSmall-Molecule Reactions

EC Number: 3.2.1.103

The direction shown, i.e. which substrates are on the left and right sides, is in accordance with the direction in which it was curated.

Mass balance status: Balance undetermined; a substrate lacks a chemical formula

Enzyme Commission Primary Name: keratan-sulfate endo-1,4-β-galactosidase

Enzyme Commission Synonyms: endo-β-galactosidase, keratan sulfate endogalactosidase, keratanase, keratan-sulfate 1,4-β-D-galactanohydrolase

Taxonomic Range: Bacteria

Enzyme Commission Summary:
This enzyme catalyzes endohydrolysis of (1→4)-β-D-galactosidic linkages in keratan sulfate .

Hydrolyses the 1,4-β-D-galactosyl linkages adjacent to 1,3-N-acetyl-α-D-glucosaminyl residues. Also acts on some non-sulfated oligosaccharides, but only acts on blood group substances when the 1,2-linked fucosyl residues have been removed (cf. EC 3.2.1.102, blood-group-substance endo-1,4-β-galactosidase).

Citations: [Fukuda76 ]

Relationship Links: BRENDA:EC:3.2.1.103, ENZYME:EC:3.2.1.103, IUBMB-ExplorEnz:EC:3.2.1.103

Credits:
Revised 26-Jul-2012 by Caspi R, SRI International


References

Fukuda76: Fukuda MN, Matsumura G (1976). "Endo-beta-galactosidase of Escherichia freundii. Purification and endoglycosidic action on keratan sulfates, oligosaccharides, and blood group active glycoprotein." J Biol Chem 251(20);6218-25. PMID: 135762


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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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