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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Proteoglycan-Lb, a small dermatan sulfate proteoglycan expressed in embryonic chick epiphyseal cartilage, is structurally related to osteoinductive factor.

We have isolated cDNA clones encoding the core protein of PG-Lb, proteoglycan which has been shown to be preferentially expressed in the zone of flattened chondrocytes of the developing chick limb cartilage (Shinomura, T., Kimata, K., Oike, Y., Yano, S., and Suzuki, S. (1984) Dev. Biol. 103, 211-220). The deduced amino acid sequence from the cDNA analysis indicates the presence of consensus leucine-rich repeats which are present in other small proteoglycans, decorin, biglycan, and fibromodulin. However, the homology analysis revealed that chick PG-Lb showed a higher homology (about 50% in the region containing leucine-rich repeats) to human osteoinductive factor, OIF, rather than to the other small proteoglycans. Furthermore, 6 cysteine residues are detected in both PG-Lb and OIF with invariant relative positions. Therefore, such an evolutionarily conserved structure in the PG-Lb core protein might be involved in some important biological functions of this molecule. In close relation to the structural similarity to OIF, the unique expression of PG-Lb in the ossifying area of cartilage suggested the possible participation of this proteoglycan in osteogenic processes.[1]


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