Primary structure of a protein isolated from reef shark (Carcharhinus springeri) cartilage that is similar to the mammalian C-type lectin homolog, tetranectin
✍ Scribed by Peter J. Neame; Carmen N. Young; James T. Treep
- Book ID
- 105356007
- Publisher
- Cold Spring Harbor Laboratory Press
- Year
- 2008
- Tongue
- English
- Weight
- 559 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0961-8368
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✦ Synopsis
Abstract
During the course of characterization of low molecular weight proteins in cartilage, we have isolated a protein from reef shark (Carcharhinus springeri) cartilage that bears a striking resemblance to the tetranectin monomer originally described by Clemmensen et al. (1986, Eur. J. Biochem. 156, 327–333). The protein was isolated by extraction of neural arch cartilage with 4 M guanidine hydrochloride, dialysis of the extract to bring the guanidine to 0.4 M (reassociating proteoglycan aggregates), followed by cesium chloride density gradient removal of the proteoglycans. The amino acid sequence had 166 amino acids and a calculated molecular weight of 18,430. The shark protein was 45% identical to human tetranectin, indicating that it was in the family of mammalian C‐type lectins and that it was likely to be a shark analog of human tetranectin. The function of tetranectin is unknown; it was originally isolated by virtue of its affinity for the kringle‐4 domain of plasminogen. Sequence comparison of human tetranectin and the shark‐derived protein gives clues to potentially important regions of the molecule.