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Endo-α-N-acetylgalactosaminidase (EC 3.2.1.97, endo-α-acetylgalactosaminidase, endo-α-N-acetyl-D-galactosaminidase, mucinaminylserine mucinaminidase, D-galactosyl-3-(N-acetyl-α-D-galactosaminyl)-L-serine mucinaminohydrolase, endo-α-GalNAc-ase, D-galactosyl-N-acetyl-α-D-galactosamine D-galactosyl-N-acetyl-galactosaminohydrolase) is an enzyme with systematic name glycopeptide-D-galactosyl-N-acetyl-α-D-galactosamine D-galactosyl-N-acetyl-galactosaminohydrolase. This enzyme catalyses the following chemical reaction

3-O-beta-D-galactosyl-N-acetyl-alpha-D-galactosaminyl-L-serine- + H₂O ${\displaystyle \rightleftharpoons }$ 3-O-beta-D-galactosyl-N-acetyl-alpha-D-galactosamine + L-serine-

The enzyme catalyses the release of Gal-(1->3)-beta-GalNAc alpha-linked to serine or threonine residues of mucin-type glycoproteins.

Glycopeptide α-N-acetylgalactosaminidases belong to family GH101 of glycoside hydrolases.

References

1. Ashida H, Maki R, Ozawa H, Tani Y, Kiyohara M, Fujita M, Imamura A, Ishida H, Kiso M, Yamamoto K (September 2008). "Characterization of two different endo-alpha-N-acetylgalactosaminidases from probiotic and pathogenic enterobacteria, Bifidobacterium longum and Clostridium perfringens". Glycobiology. 18 (9): 727–34. doi:10.1093/glycob/cwn053. PMID 18559962.
2. Koutsioulis D, Landry D, Guthrie EP (October 2008). "Novel endo-alpha-N-acetylgalactosaminidases with broader substrate specificity". Glycobiology. 18 (10): 799–805. doi:10.1093/glycob/cwn069. PMC 2553423. PMID 18635885.
3. Fujita K, Oura F, Nagamine N, Katayama T, Hiratake J, Sakata K, Kumagai H, Yamamoto K (November 2005). "Identification and molecular cloning of a novel glycoside hydrolase family of core 1 type O-glycan-specific endo-alpha-N-acetylgalactosaminidase from Bifidobacterium longum". The Journal of Biological Chemistry. 280 (45): 37415–22. doi:10.1074/jbc.m506874200. PMID 16141207.
4. Suzuki R, Katayama T, Kitaoka M, Kumagai H, Wakagi T, Shoun H, Ashida H, Yamamoto K, Fushinobu S (September 2009). "Crystallographic and mutational analyses of substrate recognition of endo-alpha-N-acetylgalactosaminidase from Bifidobacterium longum". Journal of Biochemistry. 146 (3): 389–98. doi:10.1093/jb/mvp086. PMID 19502354.
5. Gregg KJ, Boraston AB (February 2009). "Cloning, recombinant production, crystallization and preliminary X-ray diffraction analysis of a family 101 glycoside hydrolase from Streptococcus pneumoniae". Acta Crystallographica Section F. 65 (Pt 2): 133–5. doi:10.1107/s1744309108042474. PMC 2635869. PMID 19194003.
6. Ashida H, Yamamoto K, Murata T, Usui T, Kumagai H (January 2000). "Characterization of endo-alpha-N-acetylgalactosaminidase from Bacillus sp. and syntheses of neo-oligosaccharides using its transglycosylation activity". Archives of Biochemistry and Biophysics. 373 (2): 394–400. doi:10.1006/abbi.1999.1565. PMID 10620364.
7. Goda HM, Ushigusa K, Ito H, Okino N, Narimatsu H, Ito M (October 2008). "Molecular cloning, expression, and characterization of a novel endo-alpha-N-acetylgalactosaminidase from Enterococcus faecalis". Biochemical and Biophysical Research Communications. 375 (4): 441–6. doi:10.1016/j.bbrc.2008.08.065. PMID 18725192.
8. Naumoff DG (June 2010). "GH101 family of glycoside hydrolases: subfamily structure and evolutionary connections with other families". Journal of Bioinformatics and Computational Biology. 8 (3): 437–51. doi:10.1142/s0219720010004628. PMID 20556855.

External links

• Endo-alpha-N-acetylgalactosaminidase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

• Biology

• EC 3.2.1