J. Biol. Chem., Vol. 266, Issue 14, 8683-8685, May, 1991

Catabolism of aggrecan in cartilage explants. Identification of a major cleavage site within the interglobular domain

JD Sandy, PJ Neame, RE Boynton and CR Flannery
Shriners Hospital for Crippled Children, Tampa Unit, Florida 33612.

The catabolism of aggrecan has been studied in calf articular cartilage explant cultures. The chondroitin sulfate-rich, high buoyant density products that accumulate in culture medium have been purified, and NH2- terminal sequence data have been obtained. Aggrecan released from the tissue in the presence or absence of interleukin-1 alpha, whether analyzed before or after reduction and alkylation, exhibited only one major and one minor NH2-terminal sequence. The major sequence, ARGXVILXAKPDF, shows very high similarity to a region of the interglobular domain (between the G1 and G2 domains) of both human and rat aggrecan. The minor sequence, VEVS, was that previously described for the NH2 terminus of the intact core protein. These results indicate that catabolism of aggrecan in cartilage explants involves proteolytic cleavage within a conserved region of the interglobular domain and that this results in the separation of the G1 domain from the remainder of the molecule. A major product of this process is a large nonaggregating species that consists of an NH2-terminal sequence beginning with ARG (and composed of about 100 residues of the interglobular domain) that is attached to an intact G2 domain followed by an extended section of the chondroitin sulfate-bearing domain toward the COOH terminus.
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