*1 unit will hydrolyze 1 μmol of Galβ1-3GalNAcα-pNP to Galβ1-3GalNAc and pNP per min. at pH5.0 at 37°C
Yamamoto et al. have recently purified and isolated endo-α-N-acetylgalactosaminidase (Endo-α) found in the culture fluid of Bifidobacterium longum.1) Endo-α can recognize the structure of Galβ1-3GalNAc disaccharide α-linked with a hydroxyl group. It releases Galβ1-3GalNAc by hydrolysis. When a compound possessing an hydroxyl group coexists as an acceptor, the released Galβ1-3GalNAc is transferred to the acceptor.2) Discovered by Yamamoto et al., Endo-α can transfer Galβ1-3GalNAc to various compounds such as monosaccharides, peptides, and proteins, using core 1 contained in mucin-type oligosaccharide chains as a donor.
Ashida et al. have reported the oligosaccharide transfer reaction using Endo-α.2a) According to the report, Galβ1-3GalNAcα-pNP was treated with Endo-α to produce Galβ1-3GalNAc and it transferred to monosaccharides (glucose, galactose, and mannose), disaccharides (maltose and sucrose), and sugar alcohols (mannitol and sorbitol).
Thus, by using Endo-M and Endo-α properly, it is possible to transfer both N-linked and O-linked oligosaccharides. As a tool for the enzymatic synthesis of glycoconjugates, it is expected that many applications will be realized in the various fields.
This product was merchandised as the fruition of NEDO project.
References
- 1)K. Fujita, F. Oura, N. Nagamine, T. Katayama, J. Hiratake, K. Sakata, H. Kumagai, K. Yamamoto, J. Biol. Chem. 2005, 280, 37415.
- 2)a) H. Ashida, K. Yamamoto, T. Murata, T. Usui, H. Kumagai, Arch. Biochem. Biophys. 2000, 373, 394.