Phyton Holdings, LLC

Toshiomi Yoshida

Kazuhito Fujiyama

Tatsuji Seki

A method for the secretory production of a glycoprotein having a human-type sugar chain, comprising a step of introducing a gene of an enzyme capable of performing a transfer reaction of a galactose residue to a non-reducing terminal acetylglucosamine residue, and a gene of heterologous glycoprotein, to obtain a transformed plant cell, a step of culturing the plant cell, and a step of recovering the culture medium of the plant cell. The method further includes isolating the glycoprotein from the culture medium and contacting the isolated glycoprotein with a sialic acid transferase to add a sialic acid residue attached to the galactose residue in the N-glycan.

Method of co-expressing galactosyltransferase and a glycoprotein in a transgenic plant cell and sialylating the glycoprotein for production of glycoprotein having human-type sugar chain

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Osaka, Japan

Toshiomi Yoshida