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Biochem Biophys Res Commun. 2006 Jan 27;339(4):1184-9. Epub 2005 Dec 5.

Expression of human CMP-N-acetylneuraminic acid synthetase and CMP-sialic acid transporter in tobacco suspension-cultured cell.

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The International Center for Biotechnology, Osaka University, Yamada-oka 2-1, Suita-shi, Osaka 565-0871, Japan.


Plant cells have no beta1,4-galactosylated and sialylated glycan, which plays important roles in biological functions in animal cells. Previously, we generated transgenic tobacco BY2 suspension-cultured cells that produced human beta1,4-galactosyltransferase [N.Q. Palacpac, S. Yoshida, H. Sakai, Y. Kimura, K. Fujiyama, T. Yoshida, T. Seki, Stable expression of human beta1,4-galactosyltransferase in plant cells modifies N-linked glycosylation pattern, Proc. Natl. Acad. Sci. USA 96 (1999) 4692-4697]. In this study, we introduced two critical genes encoding human CMP-N-acetylneuraminic acid synthetase and CMP-sialic acid transporter into tobacco suspension-cultured cell to pave a route for sialic biosynthetic pathway. The recombinant human proteins showed their biological activities. These results show that the plant cell can be a useful bioreactor for the production of mammalian glycoproteins.

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