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FEBS Lett. 2011 Oct 3;585(19):3090-4. doi: 10.1016/j.febslet.2011.08.038. Epub 2011 Sep 1.

Overexpression of UDP-GlcNAc transporter partially corrects galactosylation defect caused by UDP-Gal transporter mutation.

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Laboratory of Biochemistry, Faculty of Biotechnology, University of Wroclaw, Wroclaw, Poland.


Nucleotide sugar transporters deliver substrates for glycosyltransferases into the endoplasmic reticulum and the Golgi apparatus. We demonstrated that overexpression of UDP-GlcNAc transporter (NGT) in MDCK-RCA(r) and CHO-Lec8 mutant cells defective in UDP-Gal transporter (UGT) restored galactosylation of N-glycans. NGT overexpression resulted in decreased transport of UDP-GlcNAc into the Golgi vesicles. This effect resembled the phenotype of mutant cells corrected by UGT1 overexpression. The transport of UDP-Gal was not significantly changed. Our data suggest that the biological function of UGT and NGT in galactosylation of macromolecules may be coupled.

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