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N-glycan sialylation in a silkworm-baculovirus expression system.
Journal of Bioscience and Bioengineering 2018 July
A silkworm-baculovirus system is particularly effective for producing recombinant proteins, including glycoproteins. However, N-glycan structures in silkworm differ from those in mammals. Glycoproteins in silkworm are secreted as pauci-mannose type N-glycans without sialic acid or galactose residues. Sialic acid on N-glycans plays important roles in protein functions. Therefore, we developed pathways for galactosylation and sialylation in silkworm. Sialylated N-glycans on proteins were successfully produced in silkworm by co-expressing galactosyltransferase and sialyltransferase and providing an external supply of a sialylation-related substrate. α2,3/α2,6 Sialylation to N-glycans was controlled by changing the type of sialyltransferase expressed in silkworm. Furthermore, the co-expression of N-acetylglucosaminyltransferase II facilitated the formation of additional di-sialylated N-glycan structures. Our results provide new information on the control of N-glycosylation in silkworm.
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