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J. Biol. Chem., Vol. 277, Issue 33, 29945-29952, August 16, 2002
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From the O-Fucose has been identified on
epidermal growth factor-like (EGF) repeats of Notch, and elongation
of O-fucose has been implicated in the modulation of
Notch signaling by Fringe. O-Fucose modifications are also
predicted to occur on Notch ligands based on the presence of the
C2XXGG(S/T)C3 consensus site (where
S/T is the modified amino acid) in a number of the EGF repeats of these
proteins. Here we establish that both mammalian and
Drosophila Notch ligands are modified with
O-fucose glycans, demonstrating that the consensus site was
useful for making predictions. The presence of O-fucose on
Notch ligands raised the question of whether Fringe, an
O-fucose specific
Notch Ligands Are Substrates for Protein
O-Fucosyltransferase-1 and Fringe*
§,
,
,
, and
Howard Hughes Medical Institute, Waksman
Institute and Department of Molecular Biology and Biochemistry,
Rutgers, The State University, Piscataway, New Jersey 08854 and the
¶ Department of Biochemistry and Cell Biology, Institute for Cell
and Developmental Biology, State University of New York,
Stony Brook, New York 11794-5215
1,3-N-acetylglucosaminyltransferase, was capable of
modifying O-fucose on the ligands. Indeed,
O-fucose on mammalian Delta1 and Jagged1 can be elongated
with Manic Fringe in vivo, and Drosophila Delta
and Serrate are substrates for Drosophila Fringe in
vitro. These results raise the interesting possibility that
alteration of O-fucose glycans on Notch ligands could play a role in the mechanism of Fringe action on Notch signaling. As an
initial step to begin addressing the role of the O-fucose
glycans on Notch ligands in Notch signaling, a number of mutations in predicted O-fucose glycosylation sites on
Drosophila Serrate have been generated. Interestingly,
analysis of these mutants has revealed that O-fucose
modifications occur on some EGF repeats not predicted by the
C2XXGGS/TC3 consensus site. A
revised, broad consensus site,
C2X3-5S/TC3 (where
X3-5 are any 3-5 amino acid residues), is proposed.
*
This work was supported by National Institutes of Health
Grants GM61126 (to R. S. H.) and GM54594 (to K. D. I.) and the Howard Hughes Medical Institute (to K. D. I.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Present address: Dept. of Cell Biology, Albert Einstein
College of Medicine, 1300 Morris Park Ave., New York, NY 10461.
**
To whom correspondence should be addressed. Tel: 631-632-7336; Fax:
631-632-8575; E-mail: Robert.Haltiwanger@SUNYSB.EDU.
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