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  • Title: Use of monoclonal antibodies to locate the chondroitin sulfate chain(s) in type IX collagen.
    Author: Irwin MH, Mayne R.
    Journal: J Biol Chem; 1986 Dec 15; 261(35):16281-3. PubMed ID: 3097005.
    Abstract:
    Recent results show that type IX collagen isolated from chicken cartilage is associated with one or perhaps two chondroitin sulfate chains. To locate the chondroitin sulfate chain(s) along the type IX collagen molecule, rotary shadowing was performed in the presence of monoclonal antibodies which recognize stubs of chondroitin sulfate generated after chondroitinase ABC digestion. Monoclonal antibodies 9-A-2 and 2-B-6 which recognize stubs of chondroitin 4-sulfate were found to bind specifically to the NC3 domain of type IX collagen, and this binding was dependent on prior digestion of the preparation with chondroitinase ABC. Monoclonal antibody 1-B-5, which recognizes unsulfated stubs of chondroitin sulfate, did not show any specific binding to type IX collagen either with or without chondroitinase ABC digestion. As a control, monoclonal antibody 2C2 was used, which in previous work was shown to bind specifically to an epitope located close to or at the NC2 domain. Binding of this antibody to NC2 was unaffected by chondroitinase ABC digestion, and no specific binding of the antibody to the NC3 domain was detected either before or after chondroitinase ABC digestion.
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