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• W2080340512 abstract "Insect cells, like other eucaryotic cells, modify many of their proteins by N-glycosylation. However, the endogenous insect cell N-glycan processing machinery generally does not produce complex, terminally sialylated N-glycans such as those found in mammalian systems. This difference in the N-glycan processing pathways of insect cells and higher eucaryotes imposes a significant limitation on their use as hosts for baculovirus-mediated recombinant glycoprotein production. To address this problem, we previously isolated two transgenic insect cell lines that have mammalian β1,4-galactosyltransferase or β1,4-galactosyltransferase and α2,6-sialyltransferase genes. Unlike the parental insect cell line, both transgenic cell lines expressed the mammalian glycosyltransferases and were able to produce terminally galactosylated or sialylated N-glycans. The purpose of the present study was to investigate the structures of the N-glycans produced by these transgenic insect cell lines in further detail. Direct structural analyses revealed that the most extensively processed N-glycans produced by the transgenic insect cell lines were novel, monoantennary structures with elongation of only the α1,3 branch. This led to the hypothesis that the transgenic insect cell lines lacked adequate endogenous N-acetylglucosaminyltransferase II activity for biantennary N-glycan production. To test this hypothesis and further extend the N-glycan processing pathway in Sf9 cells, we produced a new transgenic line designed to constitutively express a more complete array of mammalian glycosyltransferases, including N-acetylglucosaminyltransferase II. This new transgenic insect cell line, designated SfSWT-1, has higher levels of five glycosyltransferase activities than the parental cells and supports baculovirus replication at normal levels. In addition, direct structural analyses showed that SfSWT-1 cells could produce biantennary, terminally sialylated N-glycans. Thus, this study provides new insight on the glycobiology of insect cells and describes a new transgenic insect cell line that will be widely useful for the production of more authentic recombinant glycoproteins by baculovirus expression vectors." @default.
• W2080340512 created "2016-06-24" @default.
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• W2080340512 date "2002-11-21" @default.
• W2080340512 modified "2023-10-10" @default.
• W2080340512 title "Engineering the Protein N-Glycosylation Pathway in Insect Cells for Production of Biantennary, Complex N-Glycans" @default.
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• W2080340512 doi "https://doi.org/10.1021/bi026455d" @default.
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