Human heparan sulphate N-deacetylase/N-sulphotransferase 1 sulphates the NH3+ group of the glucosamine moiety of the heparan chain in heparan sulphate/heparin biosynthesis. An open cleft that runs perpendicular to the sulphate donor 3´-phosphoadenosine 5´-phosphosulphate may constitute the acceptor substrate-binding site of the sulphotransferase domain (hNST1) [Kakuta, Sueyoshi, Negishi and Pedersen (1999) J. Biol. Chem. 274, 10673–10676]. When a hexasaccharide model chain is docked into the active site, only a trisaccharide (-IdoA-GlcN-IdoA-) portion interacts directly with the cleft residues: Trp-713, His-716 and His-720 from α helix 6, and Phe-640, Glu-641, Glu-642, Gln-644 and Asn-647 from random coil (residues 640–647). Mutation of these residues either abolishes or greatly reduces hNST1 activity. Glu-642 may play the critical role of catalytic base in the sulphuryl group transfer reaction, as indicated by its hydrogen-bonding distance to the NH3+ group of the glucosamine moiety in the model and by mutational data.
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April 2003
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Conference Article|
April 01 2003
Heparan sulphate N-sulphotransferase activity: reaction mechanism and substrate recognition
Y. Kakuta;
Y. Kakuta
1
*Pharmacogenetics Section, Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, U.S.A.
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L. Li;
L. Li
2
†Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, U.S.A.
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L.C. Pedersen;
L.C. Pedersen
3
*Pharmacogenetics Section, Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, U.S.A.
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L.G. Pedersen;
L.G. Pedersen
†Laboratory of Structural Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, U.S.A.
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M. Negishi
M. Negishi
4
*Pharmacogenetics Section, Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, U.S.A.
4Present address: To whom correspondence should be addressed (e-mail negishi@niehs.nih.gov).
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Publisher: Portland Press Ltd
Online ISSN: 1470-8752
Print ISSN: 0300-5127
Copyright 2003 Biochemical Society
2003
Biochem Soc Trans (2003) 31 (2): 331–334.
Citation
Y. Kakuta, L. Li, L.C. Pedersen, L.G. Pedersen, M. Negishi; Heparan sulphate N-sulphotransferase activity: reaction mechanism and substrate recognition. Biochem Soc Trans 1 April 2003; 31 (2): 331–334. doi: https://doi.org/10.1042/bst0310331
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