Abstract
Decorin, a member of a family of proteins with leucine-rich repeat motifs, is a widely distributed extracellular matrix proteoglycan that is thought to be responsible for the structure, tissue organization, and surface properties of fibrils. In mammals, decorin carries one chondroitin/dermatan sulfate chain as a distinction from its homologue, biglycan, which contains two glycosaminoglycan chains. With the aim to study decorin-collagen interactions in chicken, where the fibrillar organization of cartilage collagens is best understood, we have isolated decorin-related proteoglycans from sternal cartilage of 40-day-old broiler chickens. Small chondroitin/dermatan sulfate proteoglycans were resolved by hydrophobic interaction chromatography into two fractions, DCN I and DCN II. Both forms contained dermatan sulfate and, in addition, keratan sulfate chains. Tryptic fingerprinting revealed that the core proteins of DCN I and DCN II were identical. The protein was identified as decorin by amino-terminal sequencing. DCN II was found to contain two dermatan sulfate chains, whereas DCN I had a single dermatan sulfate chain. The dermatan sulfate attachment sites are located near the NH2 terminus of the core protein, i.e. at Ser-4 and Ser...Continue Reading
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