Abstract
Lacto-N-tetraose (Galβ1-3GlcNAcβ1-3Galβ1-4Glc, LNT) and lacto-N-neotetraose (Galβ1-4GlcNAcβ1-3Galβ1-4Glc, LNnT) were enzymatically synthesized by consecutive additions of GlcNAc and Gal residues to lactose. Lacto-N-triose II (GlcNAcβ1-3Galβ1-4Glc) was prepared first by the transfer of GlcNAc from UDP-GlcNAc to lactose by β-1,3-N-acetylglucosaminyltransferase from bovine serum. The resulting lacto-N-triose II was converted into LNT and LNnT utilizing two kinds of β-D-galactosidase-mediated transglycosylations. Thus, β-D-galactosidase from Bacillus circulans ATCC31382 induced regioselective galactosyl transfer from o-nitrophenyl β-D-galactoside to the OH-3″ position of lacto-N-triose II, and commercially available β-D-galactosidase from B. circulans to the OH-4″ position of lacto-N-triose II. These convenient processes are suitable for large-scale preparations of LNT and LNnT. As another method, LNT was directly synthesized from lactose as an initial substance, utilizing lacto-N-biosidase (Aureobacterium sp. L-101)-mediated transglycosylation with Galβ1-3GlcNAcβ-pNP donor.
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Murata, T., Inukai, T., Suzuki, M. et al. Facile enzymatic conversion of lactose into lacto-N-tetraose and lacto-N-neotetraose. Glycoconj J 16, 189–195 (1999). https://doi.org/10.1023/A:1007020219275
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DOI: https://doi.org/10.1023/A:1007020219275
- Lacto-N-tetraose
- lacto-N-neotetraose
- β-D-galactosidase
- β-1,3-N-acetylglucosaminyltransferase
- LNT, lacto-N-tetraose (Galβ1-3GlcNAcβ1-3Galβ1-4Glc)
- LNnT, lacto-N-neotetraose (Galβ1-4GlcNAcβ1-3Galβ1-4Glc)
- UDP, uridine 5′-diphosphate
- β-gal-3, β-D-galactosidase from Bacillus circulans ATCC 31382
- β-1,3-GnT β-1,3-N-acetylglucosaminyltransferase
- HPAEC-PAD
- high performance anion exchange chromatography-pulsed amperometric detection
- ATP, adenosine 5′-triphosphate
- EtOH ethanol
- Galβ-oNP
- o-nitrophenyl β-D-galactopyranoside