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Large and small proteoglycans were separately isolated from a number of connective tissues and compared to determine the extent of structural similarity. This was studied by enzyme-linked immunosorbent assays and by the peptide patterns obtained when 125I-labelled proteoglycans were digested with trypsin. All the large proteoglycans, i.e. from tendon, sclera, cartilage and aorta, appear to contain the structure typical for the hyaluronic acid-binding region, both shown by enzyme-linked immunosorbent assay and by content of peptides unique for this region. These proteoglycans also share other structural features of the protein core, as indicated by immunological cross-reactivity and similar peptide patterns. The large proteoglycans from aorta in addition show the presence of unique structures both upon immunoassay and with regard to peptide pattern. Among the small proteoglycans two groups can be identified, although amino acid composition and protein core sizes are grossly similar. One group consists of the small proteoglycans from aorta and cartilage having similar peptide maps and showing immunological cross-reactivity in enzyme-linked immunosorbent assay. The other distinctly different group consists of the small proteoglycans from bone, cornea, sclera and tendon, which among them show identity in enzyme-linked immunosorbent assay and similar peptide patterns. Proteoglycans from the two groups, however, show partial immunological cross-reactivity.

The core proteins of large and small interstitial proteoglycans from various connective tissues form distinct subgroups