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(Received for publication, October 3, 1996, and in revised form, November 22, 1996)
From the Platelet-derived growth factors (PDGFs) are homo-
or heterodimers of two related polypeptides, known as A and B chains.
The A chain exists as two splice variants due to the alternative usage of exons 6 (PDGF-AL, longer) and 7 (PDGF-AS,
shorter). Exon 6 encodes an 18-amino acid sequence rich in basic amino
acid residues, which has been implicated as a cell retention signal.
Several lines of evidence indicate that the retention is due to binding of PDGF-AL to glycosaminoglycans, especially to heparan
sulfate. We have analyzed the saccharide domains of smooth muscle
cell-derived heparan sulfate involved in this interaction. Furthermore,
we have employed selectively modified heparin oligosaccharides to elucidate the dependence of the binding on different sulfate groups and
on fragment length. The shortest PDGF-AL binding domain
consists of 6-8 monosaccharide units. Studies using selectively
desulfated heparins and heparin fragments suggest that N-,
2-O-, and 6-O-sulfate groups all contribute to
the interaction. Structural comparison of heparan sulfate
oligosaccharides separated by affinity chromatography on immobilized
PDGF-AL showed that the bound pool was enriched in
-IdceA(2-OSO3)-GlcNSO3(6-OSO3)-
disaccharide units. Furthermore, analogous separation of a partially
O-desulfated heparin decamer preparation, using a highly
selective nitrocellulose filter-trapping system, yielded a
PDGF-AL-bound fraction in which more than half of the
disaccharide units had the structure
-IdceA(2-OSO3)-GlcNSO3(6-OSO3)-. Our results suggest that the interaction between PDGF-AL
and heparin/heparan sulfate is mediated via N-sulfated
saccharide domains containing both 2-O- and
6-O-sulfate groups.
Volume 272, Number 9,
Issue of February 28, 1997
pp. 5518-5524
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
,
,
and
Department of Medical and Physiological
Chemistry, Uppsala University, Biomedical Center, S-75123 Uppsala,
Sweden and the § Wallenberg Laboratory for Cardiovascular
Research, Sahlgren's Hospital, S-41345 Gothenburg, Sweden
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