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J Biol Chem, Vol. 273, Issue 41, 26265-26268, October 9, 1998

COMMUNICATION
The Putative Tumor Suppressors EXT1 and EXT2 Are Glycosyltransferases Required for the Biosynthesis of Heparan Sulfate

Thomas Lind, Frank Tufaro§, Craig McCormick§, Ulf Lindahl, and Kerstin Lidholt

From the Department of Medical Biochemistry and Microbiology, Uppsala University, The Biomedical Center, Box 575, S-751 23 Uppsala, Sweden and § Department of Microbiology and Immunology, University of British Columbia, Vancouver V6T 1Z3, Canada

Hereditary multiple exostoses, characterized by multiple cartilaginous tumors, is ascribed to mutations at three distinct loci, denoted EXT1-3. Here, we report the purification of a protein from bovine serum that harbored the D-glucuronyl (GlcA) and N-acetyl-D-glucosaminyl (GlcNAc) transferase activities required for biosynthesis of the glycosaminoglycan, heparan sulfate (HS). This protein was identified as EXT2. Expression of EXT2 yielded a protein with both glycosyltransferase activities. Moreover, EXT1, previously found to rescue defective HS biosynthesis (McCormick, C., Leduc, Y., Martindale, D., Mattison, K., Esford, L. E., Dyer, A. P., and Tufaro, F. (1998) Nat. Genet. 19, 158-161), was shown to elevate the low GlcA and GlcNAc transferase levels of mutant cells. Thus at least two members of the EXT family of tumor suppressors encode glycosyltransferases involved in the chain elongation step of HS biosynthesis.


Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.



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