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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1985 Mar;82(5):1321–1325. doi: 10.1073/pnas.82.5.1321

Molecular cloning and sequence analysis of a chondroitin sulfate proteoglycan cDNA.

M A Bourdon, A Oldberg, M Pierschbacher, E Ruoslahti
PMCID: PMC397252  PMID: 3919394

Abstract

We report the identification and DNA sequence of a chondroitin sulfate proteoglycan core protein cDNA. A cDNA clone, pPG1, was selected from a rat yolk sac tumor poly(A)+RNA-derived cDNA library by using synthetic oligonucleotides predicted from the NH2-terminal peptide sequence of the mature chondroitin sulfate proteoglycan. The resulting sequence analysis demonstrated that the 874-base-pair pPG1 clone contained the complete coding region of the mature proteoglycan core protein as well as 5' and 3' flanking sequences. The 104 amino acid proteoglycan core protein sequence reveals that the core protein is composed of three regions, the most striking of which is the central 49 amino acid region composed of alternating serine and glycine residues. This region clearly functions as the acceptor site for the attachment of chondroitin sulfate side chains. The serine-glycine repeat region is flanked by a 14 amino acid NH2-terminal region identical to the NH2-terminal sequence of the proteoglycan obtained by amino acid sequencing and a 41 amino acid COOH-terminal region. RNA transfer blot hybridizations of poly(A)+ mRNA from rat yolk sac tumor cells with nick-translated pPG1 reveal a single mRNA of approximately equal to 1300 nucleotides. The possibility of detecting mRNAs and genomic sequences for other proteoglycans with a serine-glycine repeat by using this cDNA clone is discussed.

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