Partial purification of pig aorta amine oxidases

Area of Science:

• Biochemistry
• Enzymology
• Vascular Biology

Background:

• Amine oxidases play crucial roles in biological processes.
• Pig aorta is a source of various enzymes, including amine oxidases.
• Understanding enzyme kinetics is vital for elucidating their physiological functions.

Purpose of the Study:

• To partially purify and characterize two distinct amine oxidases from pig aorta.
• To compare the properties of these enzymes with known amine oxidases.
• To investigate the kinetic differences between the two purified enzymes.

Main Methods:

• Partial purification of amine oxidases from pig aorta.
• Enzyme activity assays.
• Kinetic analysis including pH optimum determination.
• Inhibition studies using carbonyl reagents and chelating agents.

Main Results:

• Two amine oxidases were successfully purified from pig aorta.
• One enzyme exhibited properties similar to pig plasma benzylamine oxidase.
• The second enzyme showed characteristics of lysyl oxidase.
• Benzylamine oxidase demonstrated maximal activity at acidic pH.
• Lysyl oxidase displayed an optimal activity around pH 6.8.
• Both enzymes were inhibited by carbonyl reagents and copper chelating agents.

Conclusions:

• Pig aorta contains at least two distinct amine oxidases with differing kinetic properties.
• The identified enzymes are benzylamine oxidase and lysyl oxidase.
• Kinetic differences, particularly pH optima, suggest distinct physiological roles in the aorta.