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- W1600005578 abstract "Newly synthesized 35S-labeled chondrocytic keratan sulfate chains were generated by chondrocytes of human chondrosarcoma cell line 105KC and were analyzed for heterogeneity of regional substitution, hydrodynamic size, and charge density. After isolation of the high density large chondrocytic proteoglycans and sequential digestions with chondroitinase ABC, L-1-tosylamido-2-phenylethyl chloromethyl ketone-treated trypsin, and alpha-chymotrypsin, followed by Superose 6 chromatography, two populations of keratan sulfate-containing proteoglycan fragments were identified and pooled separately. Keratan sulfate chains from each of the regions were compared after release by Pronase digestion, and differences in substitution patterns were observed; keratan sulfate chains of greater polydispersity, as well as a population of larger hydrodynamic size, were present in only one of the two regions. Alkaline/borohydride treatment confirmed both the existence of a population of uniquely large keratan sulfate chains and its restriction to a single region of proteoglycan fragments. In addition to heterogeneity of hydrodynamic size, the keratan sulfate chains exhibited regional heterogeneity of charge density and hence, of sulfation patterns. Analysis by Mono Q chromatography identified distinct groups of keratan sulfate that segregated by charge density and whose proportionate composition differed between the proteoglycan regions. Furthermore, the most highly charged species were unique to a single region and encompassed the chains of larger hydrodynamic size. This suggests that there may be regional heterogeneity of keratan sulfate chains substituted along a single class of proteoglycans and identifies a novel population of large, highly sulfated chondrocytic keratan sulfate chains." @default.
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- W1600005578 date "1992-04-01" @default.
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- W1600005578 title "Heterogeneity of keratan sulfate substituted on human chondrocytic large proteoglycans." @default.
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- W1600005578 doi "https://doi.org/10.1016/s0021-9258(18)42511-2" @default.
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