Abstract
Link modules are hyaluronan-binding domains that are involved in the formation and stability of extracellular matrix and cell migration. We have examined the glycosaminoglycan specificity of the Link module from the arthritis-associated protein, human TSG-6, by microtitre plate-based assays employing biotinylated-hyaluronan or mono-biotinylated Link module. This domain was found to interact specifically with chondroitin-4-sulphate (C4S), with similar affinity to hyaluronan, but not with chondroitin-6-sulphate or heparin. Competition experiments indicate that C4S and hyaluronan have overlapping binding surfaces on the TSG-6 Link module. Disease-associated changes in C4S expression may influence the localisation and biological role of TSG-6.
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