ISSN:
1573-4986
Keywords:
glycosaminoglycan
;
dermatan sulfate
;
xylosides
;
sequencing
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract To generate xyloside-primed dermatan sulfate suitable for sequence analysis, skin fibroblasts were incubated withp-hydroxyphenyl-β-d-xylopyranoside and [3H]galactose, and free [3H]glycosaminoglycan chains were isolated from the culture medium by ion exchange and gel chromatography. After125I labelling of their reducing-terminal hydroxyphenyl groups, chains were subjected to various chemical and enzymatic degradations, both partial and complete, followed by gradient polyacrylamide gel electrophoresis and autoradiographic identification of fragments extending from the labelled reducing-end to the point of cleavage. Results of periodate oxidation-alkaline scission indicated that the xylose moiety remained unsubstituted at C-2/C-3; exhaustive treatment with chondroitin AC-I lyase afforded the fragment ΔHexA-Gal-Gal-Xyl-R (R = radio-iodinated hydroxyphenyl group), and complete degradations with chondroitin ABC lyase as well as testicular hyaluronidase yielded the fragments ΔHexA/HexA-GalNAc-GlcA-Gal-Gal-Xyl-R with or without sulfate on theN-acetylgalactosamine. Partial digestions with testicular hyaluronidase or chondroitin B lyase indicated that glucuronic acid was common in the first three repeats after the linkage region and that iduronic acid could occupy any position thereafter. Hence, there were no indications of a repeated, periodic appearance of the clustered GlcA-GalNAc repeats which was previously observed in proteoglycan derived dermatan sulfate [Fransson L-Å, Havsmark B, Silverberg I (1990)Biochem J 269:381–8], suggesting a role for the protein part in controlling the formation of particular copolymeric features during glycosaminoglycan assembly.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00731177
Permalink
