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Antibodies have been raised in rabbits to the hyaluronate-binding region and link-protein components of aggregated proteoglycans from pig laryngeal cartilage. The anti-(binding region) antibodies did not bind 125I-labelled link protein, nor was 125I-labelled binding region bound by the anti-(link protein) antibodies. The antisera were applied in sensitive inhibition radioimmunoassays to determine binding region and link protein in purified proteoglycan preparations. With intact proteoglycan aggregates, the antigenic sites of link protein, and to a lesser extent binding region, were masked. Heat treatment in the presence of sodium dodecyl sulphate (0.025%, w/v) was found to overcome this masking, thereby allowing the determination of link protein and binding region in aggregated proteoglycan preparations in pure and impure samples.

Cartilage proteoglycan binding region and link protein. Radioimmunoassays and the detection of masked determinants in aggregates