Glycobiology Advance Access originally published online on October 30, 2002
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Glycobiology, 2003, Vol. 13, No. 1 35-42
© 2003 Oxford University Press
Glycosaminoglycan structures required for strong binding to midkine, a heparin-binding growth factor
2 Department of Biochemistry, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
3 Department of Life Science, Aichi University of Education, Kariya, Aichi 448-8542, Japan
4 Meiji Dairies Corporation, 540 Naruda, Odawara 250-0862, Japan
Received on July 22, 2002; revised on August 16, 2002; accepted on August 18, 2002
Midkine (MK), a heparin-binding growth factor, binds strongly to oversulfated structures in chondroitin sulfates (CSs) and heparan sulfate. To elucidate the carbohydrate structure actually involved in the strong binding, dissected brains from 13-day mouse embryos were incubated with [14C]-glucosamine. The labeled glycosaminoglycans were fractionated by MK-agarose affinity chromatography to a weakly binding fraction, which was eluted by 0.5 M NaCl, and a strongly binding fraction, which was eluted by higher NaCl concentrations. Among the unsaturated disaccharides released from the strongly binding fraction by chondroitinase ABC,
Di-diSE with 4,6-disulfated N-acetylgalactosamine accounted for 32.3%, whereas its content was lower in the weakly binding fraction. Artificial CS-E structure was formed using N-acetylgalactosamine 4-sulfate 6-O-sulfotransferase purified from squid or recombinant human enzyme. Analysis of the products and their interaction with MK revealed that E units without 3-O-sulfation of glucuronic acid are sufficient for strong binding, provided that they are present as a dense cluster. Among the sulfated disaccharides released by heparitinase digestion, the trisulfated one,
DiHS-triS, was the most abundant in the strongly binding fraction and was lower in the weakly binding fraction. Together with results of previous studies, we concluded that the multivalent trisulfated heparin-like unit is another structure involved in strong binding to MK.
1 To whom correspondence should be addressed; e-mail: tmurama{at}med.nagoya-u.ac.jp
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