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Characterization of type XI collagen-glycosaminoglycan interactions

Vaughan-Thomas, Anne, Young, Robert D., Phillips, Anne C. and Duance, Victor Colin 2001. Characterization of type XI collagen-glycosaminoglycan interactions. The Journal of Biological Chemistry 276 (7) , pp. 5303-5309. 10.1074/jbc.M008764200

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Using competitive binding experiments, it was found that native type XI collagen binds heparin, heparan sulfate, and dermatan sulfate. However, interactions were not evident with hyaluronic acid, keratan sulfate, or chondroitin sulfate chains over the concentration range studied. Chondrocyte-matrix interactions were investigated using cell attachment to solid phase type XI collagen. Pretreatment of chondrocytes with either heparin or heparinase significantly reduced attachment to type XI collagen. Incubation of denatured and cyanogen bromide-cleaved type XI collagen with radiolabeled heparin identified sites of interaction on the 1(XI) and 2(XI) chains. NH2-terminal sequence data confirmed that the predominant heparin-binding peptide contained the sequence GKPGPRGQRGPTGPRGSRGAR from the 1(XI) chain. Using rotary shadowing electron microscopy of native type XI collagen molecules and heparin-bovine serum albumin conjugate, an additional binding site was identified at one end of the triple helical region of the collagen molecule. This coincides with consensus heparin binding motifs present at the amino-terminal ends of both the 1(XI) and the 2(XI) chains. The contribution of glycosaminoglycan-type XI collagen interactions to cartilage matrix stabilization is discussed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: American Society for Biochemistry and Molecular Biology
ISSN: 0021-9258
Last Modified: 04 Jun 2017 01:37

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