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ADAMTS-1 cleaves a cartilage proteoglycan, aggrecan
1Department of Molecular Membrane Biology, Cancer Research Institute, Kanazawa University, Ishikawa, Japan. kkuno@kenroku.kanazawa-u.ac.jp
FEBS Letters
|August 10, 2000
Summary
A disintegrin-like and metalloproteinase with thrombospondin type I motifs-1 (ADAMTS-1) cleaves aggrecan, a key cartilage proteoglycan. This finding suggests ADAMTS-1
Area of Science:
- Biochemistry
- Molecular Biology
- Extracellular Matrix Biology
Background:
- ADAMTS-1 is an extracellular matrix-anchored metalloproteinase.
- Cartilage proteoglycans, like aggrecan, are crucial for cartilage structure and function.
Purpose of the Study:
- To investigate the enzymatic activity of ADAMTS-1 on aggrecan.
- To identify the specific cleavage site and functional domains involved in aggrecan degradation by ADAMTS-1.
Main Methods:
- Biochemical assays to assess aggrecan cleavage by ADAMTS-1.
- N-terminal sequencing to identify the precise cleavage site on aggrecan.
- Deletional analysis of ADAMTS-1 to determine the role of its C-terminal spacer region.
Main Results:
- ADAMTS-1 was demonstrated to cleave aggrecan, a major cartilage proteoglycan.
- The cleavage occurs at the Glu(1871)-Leu(1872) bond within aggrecan's chondroitin sulfate attachment domain.
- The C-terminal spacer region of ADAMTS-1 is essential for aggrecan degradation.
Conclusions:
- ADAMTS-1 possesses aggrecanase activity, cleaving aggrecan within a critical domain.
- The C-terminal spacer of ADAMTS-1 is required for its aggrecan-degrading function.
- These findings implicate ADAMTS-1 in the physiological turnover of aggrecan in vivo.