Stabilization of human prostatic acid phosphatase by coupling with chondroitin sulfate.
Human prostatic acid phosphatase (PAP) (EC 3.1.3.2) was covalently linked to chondroitin sulfate A from whale cartilage. In order to bind the protein amino groups with the preactivated carboxyl groups of chondroitin sulfate, 1-ethyl-3-(3'-dimethylaminepropyl)carbodiimide and N-hydroxysulfosuccinimide were used as coupling agents. The product was soluble and enzymatically active. The activity was on average 25% higher than that of the free enzyme. The product was heterogeneous in respect to charge and Mr (50-1500) kDa, as determined by chromatography on Sephacryl S 300 and polyacrylamide gel electrophoresis. The resulting polymers contained covalently bound chondroitin sulfate, as shown by the biotin-avidin test. The modified enzyme is more resistant against various denaturing agents, e.g., urea, ethanol, and heat. Thus covalent modification of PAP by cross-linking to chondroitin sulfate could be the preferred method for stabilization of its biological activity.
Luchter-Wasylewska
E
E
Institute of Medical Biochemistry, Medical Academy, Kraków, Poland.
Dulińska
J
J
Ostrowski
W S
WS
Torchilin
V P
VP
Trubetskoy
V S
VS
D000135:Acid Phosphatase / Q000378:metabolism*; D002809:Chondroitin Sulfates / Q000378:metabolism*; D003432:Cross-Linking Reagents; D004795:Enzyme Stability; D006801:Humans; D008297:Male; D015394:Molecular Structure; D011467:Prostate / Q000201:enzymology*; D011485:Protein Binding; D013056:Spectrophotometry, Ultraviolet
D003432:Cross-Linking Reagents; D002809:Chondroitin Sulfates; D000135:Acid Phosphatase