The presence of a cathepsin B-like enzyme in rabbit ear cartilage was established by the use of the synthetic substrates benzoyl-l-arginine amide and benzoyl-dl-arginine 2-naphthylamide. This was facilitated by using a technique that permits the incubation of a fixed weight of thin (18μ) cartilage sections with an appropriate exogenous substrate. The enzymic properties of cathepsin B in cartilage have been compared with an endogenous enzyme that liberates chondromucopeptide by degrading the cartilage matrix autocatalytically at pH5. Besides being maximally active at pH4·7, these cartilage enzymes are enhanced in activity by cysteine and inhibited by arginine analogues, iodoacetamide, chloroquine and mercuric chloride. They are not inhibited by EDTA, di-isopropyl phosphorofluoridate and diethyl p-nitrophenyl phosphate. When inhibiting the release of chondromucopeptide from cartilage at pH5, the arginine-containing synthetic substrates are hydrolysed simultaneously. These enzymes also share the same heat-inactivation characteristics at various pH values, being stable at acid pH and unstable at neutral and alkaline pH. The experimental evidence indicates that a cathepsin B-like enzyme may be partly responsible for the autolytic degradation of cartilage matrix at pH5.
Skip Nav Destination
Research Article| November 01 1967
Characterization of cathepsins in cartilage
S. Y. Ali;
Biochem J (1967) 105 (2): 549–557.
- Views Icon Views
- Share Icon Share
S. Y. Ali, L. Evans, E. Stainthorpe, C. H. Lack; Characterization of cathepsins in cartilage. Biochem J 1 November 1967; 105 (2): 549–557. doi: https://doi.org/10.1042/bj1050549
Download citation file:
Don't already have an account? Register
Get Access To This Article
Buy This Article