Glycobiology, 1999, Vol. 9, No. 12 1397-1406
© 1999 Oxford University Press
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The relationship between ST6Gal I Golgi retention and its cleavage-secretion
3 Department of Biochemistry and Molecular Biology, University of Illinois at Chicago, College of Medicine, Chicago, IL 60612, USA, 4 Department of Biomolecular Characterization, and 5 Molecular Glycobiology, Frontier Research Program, the Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351–0198, Japan
The ST6Gal I is a sialyltransferase that modifies N-linked oligosaccharides of glycoproteins. Previous results suggested a role for luminal stem and active domain sequences in the efficiency of ST6Gal I Golgi retention. Characterization of a series of STtyr isoform deletion mutants demonstrated that the stem is sensitive to proteases and that preventing cleavage in this region leads to increased cell surface expression. A mutant lacking amino acids 32–104 (ST
4) is not active or cleaved and secreted like the wild type STtyr, but does exhibit increased cell surface expression. It is probable that the ST4 mutant lacks the stem region and some amino acids of the active domain because the ST5 mutant lacking amino acids 86–104 is also not active but is cleaved and secreted. In contrast, deletion of stem amino acids between residues 32 and 86 in the ST1, ST2, and ST3 mutants does not inactive these enzyme forms, eliminate their cleavage and secretion, or increase their cell surface expression. Surprisingly, cleavage occurs even though the previously identified Asn63-Ser 64 cleavage site is missing. Further evaluation demonstrated that a cleavage site between Lys 40 and Glu 41 is used in COS cells. Mutagenesis of Lys 40 significantly decreased, but did not eliminate cleavage, suggesting that there are additional secondary sites of cleavage in the ST6Gal I stem.
1 Present title and address: Special researcher, Basic Science Program, Molecular Glycobiology, Frontier Research Program, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351–0198, Japan
2 To whom correspondence should be addressed at: Department of Biochemistry and Molecular Biology, University of Illinois at Chicago, College of Medicine, 1819 West Polk Street M/C 536, Chicago, IL 60612
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