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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

TSG-6 interacts with hyaluronan and aggrecan in a pH-dependent manner via a common functional element: implications for its regulation in inflamed cartilage.

Cartilage matrix is stabilised by the interactions of proteins with hyaluronan (HA). We compare the pH dependences of HA binding by aggrecan, link protein and TSG-6. Aggrecan and link protein exhibit maximal binding across a wide pH range (6.0-8.0). TSG-6, a protein that is only produced during inflammation, binds maximally at about pH 6.0 but shows a dramatic loss of function with increasing pH. TSG-6 also interacts with aggrecan, with a similar pH dependence, and this can be inhibited by HA. Thus, a common binding surface on TSG-6 may be involved in HA and aggrecan binding. We propose that TSG-6 is involved in matrix dissociation and that this is regulated by pH gradients in cartilage.[1]

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