N-sulfotestosteronan, a novel substrate for heparan sulfate 6-O-sulfotransferases and its analysis by oxidative degradation

Li, Guoyun
Masuko, Sayaka
Green, Dixy E.
Xu, Yongmei
Li, Lingyun
Zhang, Fuming
Xue, Changhu
Liu, Jian
Deangelis, Paul L.
Linhardt, Robert J.
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Biology , Chemistry and chemical biology , Chemical and biological engineering , Biomedical engineering
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N-sulfotestosteronan, a novel substrate for heparan sulfate 6-O-sulfotransferases and its analysis by oxidative degradation, G. Li, S. Masuko, D. E. Green, Y. Xu, L. Li, F. Zhang, C. Xue, J. Liu, P. L. DeAngelis, R. J. Linhardt, Biopolymers 99, 675-685, 2013
Testosteronan, an unusual glycosaminoglycan (GAG) first isolated from the microbe Comamonas testosteroni, was enzymatically synthesized in vitro by transferring uridine diphosphate sugars on β-p-nitrophenyl glucuronide acceptor. After chemically converting testosteronan to N-sulfotestosteronan it was tested as a substrate for sulfotransferases involved in the biosynthesis of the GAG, heparan sulfate. Studies using (35) S-labeled 3'-phosphoadenosine-5'-phosphosulfate (PAPS) showed that only 6-O-sulfotransferases acted on N-sulfotestosteronan. An oxidative depolymerization reaction was explored to generate oligosaccharides from (34) S-labeled 6-O-sulfo-N-sulfotestosteroran using (34) S-labeled PAPS because testosteronan was resistant to all of the tested GAG-degrading enzymes. Liquid chromotography-mass spectrometric analysis of the oxidatively depolymerized polysaccharides confirmed the incorporation of (34) S into ∼14% of the glucosamine residues. Nuclear magnetic resonance spectroscopy also showed that the sulfo groups were transferred to ∼20% of the 6-hydroxyl groups in the glucosamine residue of N-sulfotestosteronan. The bioactivity of 6-O-sulfo-N-sulfotestosteronan was examined by performing protein-binding studies with fibroblast growth factors and antithrombin (AT) III using a surface plasmon resonance competition assay. The introduction of 6-O-sulfo groups enhanced N-sulfotestosteronan binding to the fibroblast growth factors, but not to AT III.
Biopolymers 99, 675-685
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The Linhardt Research Labs.
The Shirley Ann Jackson, Ph.D. Center for Biotechnology and Interdisciplinary Studies (CBIS)
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Rensselaer Polytechnic Institute, Troy, NY
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