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Tendon extracellular matrix contains pentameric thrombospondin-4 (TSP-4)
N Hauser1, M Paulsson, A A Kale
1Institute for Biochemistry, Medical Faculty, University of Cologne, Germany.
FEBS Letters
|July 17, 1995
Summary
This study identifies Thrombospondin-4 (TSP-4) as a major component of bovine tendon, confirming its pentameric structure. Researchers utilized protein sequencing and electron microscopy to characterize this abundant matrix protein.
Area of Science:
- Biochemistry
- Molecular Biology
- Extracellular Matrix Research
Background:
- Cartilage oligomeric matrix protein (COMP) preparations from bovine tendon contained unexpected polypeptides.
- These contaminants were identified as related to Thrombospondin-4 (TSP-4).
Purpose of the Study:
- To identify and characterize contaminating polypeptides in COMP preparations.
- To confirm the structural model of TSP-4.
- To determine the abundance of TSP-4 in tendon.
Main Methods:
- N-terminal protein sequencing
- Heparin affinity chromatography
- Electron microscopy
Main Results:
- Two contaminating polypeptides (120 and 135 kDa) showed homology to TSP-4.
- Heparin affinity chromatography enriched TSP-4.
- Electron microscopy confirmed a pentameric structure for TSP-4, consistent with previous models.
- TSP-4 was found to be abundant in bovine tendon.
Conclusions:
- TSP-4 is a significant component of bovine tendon.
- The pentameric structure of TSP-4 is confirmed through biochemical and imaging techniques.