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JBC, Vol. 254, Issue 19, 9369-9372, Oct, 1979

Radioimmunoassay of the link proteins associated with bovine nasal cartilage proteoglycan

B. Caterson, J. R. Baker, D. Levitt and J. W. Paslay

Link proteins from bovine nasal cartilage have been purified by preparative polyacrylamide gel electrophoresis in sodium dodecyl sulfate (Baker, J.R., and Caterson, B. (1979) J. Biol. Chem. 254, 2387-2393) and used to raise antisera in rabbits. A sensitive radioimmunoassay procedure utilizing binding of 125I-labeled antigen . antibody complexes to Protein A of Staphylococcus aureus has served to demonstrate the specificity of the antisera for the link proteins. The lack of reactivity with proteoglycan fractions indicates that link proteins and proteoglycan do not share antigenic determinants. This result is in accord with published cyanogen bromide peptide cleavage data (Baker, J.R., and Caterson B. (1977) Biochem. Biophys. Res. Commun. 77, 1-10) which showed proteoglycan and link protein to be structurally dissimilar. The radioimmunoassay procedure has been used to quantitate small amounts of link protein which remain associated with proteoglycan after purification by equilibrium density gradient centrifugation in 4 M guanidine HCl and by gel chromatography in sodium dodecyl sulfate.
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