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J. Biol. Chem., Vol. 277, Issue 34, 30567-30573, August 23, 2002
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From the Heparan sulfate is crucial for
vital reactions in the body because of its ability to bind various
proteins. The identification of protein-binding heparan sulfate
sequences is essential to our understanding of heparan sulfate biology
and raises the possibility to develop drugs against diseases such as
cancer and inflammatory conditions. We present proof-of-principle that
in vitro generated heparan sulfate oligosaccharide
libraries can be used to explore interactions between heparan sulfate
and proteins, and that the libraries expand the available heparan
sulfate sequence space. Oligosaccharide libraries mimicking highly
6-O-sulfated domains of heparan sulfate were constructed by
enzymatic O-sulfation of O-desulfated,
end-group 3H-labeled heparin octasaccharides. Acceptor
oligosaccharides that were 6-O-desulfated but only
partially 2-O-desulfated yielded oligosaccharide arrays
with increased ratio of iduronyl 2-O-sulfate/glucosaminyl 6-O-sulfate. The products were probed by affinity
chromatography on immobilized growth factors, fibroblast growth
factor-1 (FGF1) and FGF2, followed by sequence analysis of trapped
oligosaccharides. An N-sulfated octasaccharide, devoid of
2-O-sulfate but with three 6-O-sulfate groups,
was unexpectedly found to bind FGF1 as well as FGF2 at physiological
ionic strength. However, a single 2-O-sulfate group in the
absence of 6-O-sulfation gave higher affinity for FGF2.
FGF1 binding was also augmented by 2-O-sulfation,
preferentially in combination with an adjacent upstream
6-O-sulfate group. These results demonstrate the potential
of the enzymatically generated oligosaccharide libraries.
Department of Medical Biochemistry and
Microbiology, Uppsala University, Biomedical Center, Box 582, SE-751 23 Uppsala, Sweden, § G. Ronzoni Institute for
Chemical and Biochemical Research, via G. Colombo, 81-20133 Milan,
Italy, and
Centro de Investigaciones Biológicas (Consejo
Superior de Investigaciones Científicas), Velázques, 144, 28006 Madrid, Spain
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