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Glycobiology, 2001, Vol. 11, No. 9 731-740
© 2001 Oxford University Press

Evidence for glycosylation-dependent activities of polypeptide N-acetylgalactosaminyltransferases rGalNAc-T2 and -T4 on mucin glycopeptides

Franz-Georg Hanisch1,2, Celso A. Reis3, Henrik Clausen3 and Hans Paulsen4

2Institute of Biochemistry, Medical Faculty of the University, Joseph-Stelzmann-Str. 52, 50931 Köln, Germany, 3School of Dentistry, Department of Diagnostics, Faculty of Health Sciences, Norre Alle 20, DK 2200, Denmark, and 4Institute of Organic Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany

We present evidence that site-specific O-glycosylation by recombinant polypeptide N-acetylgalactosaminyltransferases rGalNAc-T2 and -T4 is controlled by the primary sequence context, as well as by the position and structure of previously introduced O-glycans. Synthetic mucin-type (glyco)peptides corresponding to sections of the tandem repeat regions of MUC1, MUC2, and MUC4 were used as substrates for recombinant polypeptide N-acetylgalactosaminyltransferases, rGalNAc-T2 and -T4. By concerted and sequential action the two transferases are able to fully glycosylate MUC1 but only partially MUC2 and MUC4 tandem repeat peptides. GalNAc residues on MUC1 acceptor peptides trigger activity of rGalNAc-T4 directed to Ser in VTSA and Thr in PDTR and of rGalNAc-T2 to Ser/Thr within the GSTA motif of variant MUC1 peptides. However, elongation of GalNAc by ß3-galactosylation inhibits rGalNAc-T4 activity completely and rGalNAc-T2 activity with respect to the acceptor site GSTA. These findings are in accord with the inhibition of rGalNAc-T2 and -T4 by fully GalNAc-substituted MUC1 repeat peptide and support a glycosylation-dependent activity induction or enhancement of both enzymes.

1 To whom correspondence should be addressed


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