title: Enzymatic reconstruction of dermatan sulfate.
abstract: We investigated the enzymatic reconstruction of dermatan sulfate (DS) using the transglycosylation reaction of testicular hyaluronidase. First, in order to insert the IdoA-GalNAc disaccharide unit into chondroitin sulfate chains consisting of GlcA-GalNAc disaccharide units, desulfated DS as a donor and pyridylaminated (PA) chondroitin 6-sulfate (Ch6S) hexasaccharide as an acceptor were subjected to a transglycosylation reaction using testicular hyaluronidase. The products were analyzed by HPLC, mass spectrometry, and enzymatic digestions, and the results indicated that one of the products was IdoA-GalNAc-(GlcA-GalNAc6S)(3)-PA. Next, when the resulting PA-Ch6S (hexa-)desulfated DS (di-)octasaccharide was used as an acceptor and chondroitin as a new donor, a decasaccharide having a GlcA-GalNAc-IdoA-GalNAc-(GlcA-GalNAc6S)(3) sequence was reconstructed. Using suitable combinations of donors and acceptors, it was possible to custom synthesize DS having any IdoA sequence as its uronic acid component. It is likely that application of this system would facilitate artificial reconstruction of variant DS having different specific functions.
authors.affiliation: Department of Biochemistry, Hirosaki University School of Medicine, 5 Zaifu-cho, Hirosaki, 036-8562, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takagaki
authors.forename: H
authors.initials: H
authors.lastname: Munakata
authors.forename: I
authors.initials: I
authors.lastname: Kakizaki
authors.forename: M
authors.initials: M
authors.lastname: Majima
authors.forename: M
authors.initials: M
authors.lastname: Endo
mesh_terms: D000818:Animals; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D003871:Dermatan Sulfate / Q000737:chemistry / Q000378:metabolism*; D020723:Glucuronic Acid / Q000378:metabolism; D005966:Glucuronidase / Q000378:metabolism*; D006031:Glycosylation; D006821:Hyaluronoglucosaminidase / Q000378:metabolism*; D007067:Iduronic Acid / Q000378:metabolism; D008297:Male; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D013737:Testis / Q000201:enzymology
chemical_list: D003871:Dermatan Sulfate; D007067:Iduronic Acid; D020723:Glucuronic Acid; D005966:Glucuronidase; D006821:Hyaluronoglucosaminidase