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Identification of human hyaluronidase-4 as a novel chondroitin sulfate hydrolase that preferentially cleaves the galactosaminidic linkage in the trisulfated tetrasaccharide sequence

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Title: Identification of human hyaluronidase-4 as a novel chondroitin sulfate hydrolase that preferentially cleaves the galactosaminidic linkage in the trisulfated tetrasaccharide sequence
Authors: Kaneiwa, Tomoyuki Browse this author
Mizumoto, Shuji Browse this author
Sugahara, Kazuyuki Browse this author
Yamada, Shuhei Browse this author
Keywords: chondroitin sulfate
glycosaminoglycan
hyaluronan
hyaluronidase
sulfated oligosaccharide
Issue Date: Mar-2010
Publisher: Oxford University Press
Journal Title: Glycobiology
Volume: 20
Issue: 3
Start Page: 300
End Page: 309
Publisher DOI: 10.1093/glycob/cwp174
PMID: 19889881
Abstract: Human hyaluronidases have been considered to be the enzymes acting at the initial step in the catabolism of chondroitin sulfate (CS) in vivo. However, human hyaluronidase-1 digests CS more slowly than hyaluronan (HA), and its preferred substrate is HA rather than CS. We have identified a chondroitin hydrolase in Caenorhabditis elegans, which effectively degrades chondroitin but depolymerizes HA to a much lesser extent (Kaneiwa T, Yamada S, Mizumoto S, Montaño AM, Mitani S, Sugahara K. 2008. J Biol Chem. 283: 14971-14979), suggesting the existence of CS-specific endoglycosidases in mammalian systems. In this study, human hyaluronidase-4 was demonstrated to be a CS-specific endo-β-N-acetylgalactosaminidase. This is the first demonstration of a CS hydrolase in higher organisms. The specificity of a purified recombinant form of the enzyme was investigated in detail through the characterization of degradation products. The best substrate of the CS hydrolase was the galactosaminidic linkage in the sequence of a trisulfated tetrasaccharide GlcUA(2-O-sulfate)-GalNAc(6-O-sulfate)-GlcUA-GalNAc(4-O- or 6-O-sulfate), where GlcUA and GalNAc represent D-glucuronic acid and N-acetyl-D-galactosamine, respectively. The disaccharide unit on the nonreducing side, GlcUA(2-O-sulfate)-GalNAc(6-O-sulfate) (D unit), is rich in shark fin cartilage CS-D among various CS isoforms. CS hydrolase will be a useful tool for investigating CS-specific functions in tissues and cells. In addition, it may well be applicable to the treatment of acute spinal cord injuries as in the case of, or instead of, the bacterial CS lyase which has been used for recent clinical trials.
Rights: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Glycobiology following peer review. The definitive publisher-authenticated version Glycobiology 2010 20(3):300-309 is available online at: http://glycob.oxfordjournals.org/cgi/content/abstract/20/3/300
Type: article (author version)
URI: http://hdl.handle.net/2115/44894
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山田 修平

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