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. 1982 Jun 1;203(3):683–689. doi: 10.1042/bj2030683

Isolation and biochemical characterization of the tryptic fragments of bovine nasal-cartilage proteoglycan monomer of high buoyant density.

H D Keiser, J B Adlersberg, H M Steinman
PMCID: PMC1158284  PMID: 7115309

Abstract

Relatively homogeneous fractions of proteoglycan fragments were prepared from tryptic digests of the 4M-guanidinium chloride extract of bovine nasal cartilage. Glycosaminoglycan-containing fragments were separated from non-proteoglycan contaminants by ion-exchange chromatography and fractionated by equilibrium density-gradient centrifugation under dissociative conditions. The fractions of highest buoyant density were chromatographed on a column of Sepharose 4B, digested with chondroitinase ABC and chromatographed on a column of Sepharose 6B, yielding two distinct fractions: fraction B/6B-4 contained fragments from the chondroitin sulphate-bearing region of the proteoglycan monomer, and fraction B/6B-2 fragments from the keratan sulphate-rich region, most probably including a chondroitin sulphate-bearing monomer segment. By dansyl chloride analysis, fraction B/6B-2 had alanine and leucine as sole and fraction B/6B-4 had isoleucine and leucine as greatly predominant N-terminal amino acids, indicative of the relative homogeneity of these preparations of cartilage proteoglycan monomer fragments.

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Selected References

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