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. 1989 May 15;260(1):277–282. doi: 10.1042/bj2600277

Structural and immunological studies of keratan sulphates from mature bovine articular cartilage.

D J Thornton 1, H G Morris 1, G H Cockin 1, T N Huckerby 1, I A Nieduszynski 1, I Carlstedt 1, T E Hardingham 1, A Ratcliffe 1
PMCID: PMC1138657  PMID: 2528344

Abstract

Two populations of alkaline-borohydride-reduced keratan sulphate (KS) chains were prepared from the two peptido-keratan sulphate trypsin fragments of proteoglycan aggregates isolated from bovine femoral head cartilage (6-year-old animals). Each population was separated by high-performance ion-exchange chromatography on a Pharmacia Mono-Q column into eight pools, Q1-Q8. These were analysed by gel permeation chromatography, radioimmunoassay with the monoclonal antibody MZ15, and 500 MHz 1H n.m.r. spectroscopy. Upon chromatography on Sephadex G-75 the Mono-Q fractions were shown to increase in hydrodynamic size progressively from Q1 to Q8 for both KS populations. For each population the strongest antigenic response with the anti-KS monoclonal antibody MZ15 was expressed by the two fractions of greatest size and charge density, Q7 and Q8. Proton n.m.r. spectroscopic studies on the two series of fractions demonstrated: (i) a progressive increase in the level of galactose sulphation from Q1 to Q8, (ii) the presence of approximately one alpha(1-3)-linked fucose residue per chain in every sample, and (iii) the presence of N-acetylneuraminic acids in three discrete environments, two alpha(2-3)- and one alpha(2-6)-linked in every sample. The results are discussed in terms of a possible heterogeneity in the carbohydrate-protein linkage region of keratan sulphates from bovine articular cartilage.

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Selected References

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