Abstract
cDNAs encoding the Mr 54,000 chicken cartilage matrix protein (CMP) were selected from a cartilage cDNA expression library by immunological means. Antibodies elicited against insert-encoded protein purified from one of the clones reacted specifically with chicken CMP in immunoblots of total cartilage extract, providing positive identification of the cDNA clones isolated. The cDNAs detect a 3.4-kilobase transcript that was present in sternal cartilage and in cartilaginous but not in precartilaginous embryonic limb tissues. The cDNAs code for 416 amino acids of the chicken CMP, including its COOH terminus. There are two striking features in the deduced CMP amino acid sequence: first, it contains a region with significant homologies to repeat sequences in the precursor for epidermal growth factor; and second, it is made up of two large homologous repeat sequences. These results provide the first detailed structural information on the CMP and establish it as a developmentally regulated marker of cartilage differentiation.
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