Sequential one-pot multienzyme (OPME) synthesis of LNnTβProN3 (23). Enzymes: BLNahK or NahK_ATCC55813, Bifidobacterium longum N-acetylhexosamine-1-kinase; PmGlmU, Pasteurella multocida N-acetylglucosamine uridyltransferase; PmPpA, Pasteurella multocida inorganic pyrophosphatase; NmLgtA, Neisseria meningitidis β1–3-N–acetylglucosaminyltransferase; EcGalK, Escherichia coli galactokinase; BLUSP, Bifidobacterium longum UDP-sugar pyrophosphorylase; NmLgtB, Neisseria meningitidis β1–4-galactosyltransferase.