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Sheep tissue acetyl coenzyme A-dependent arylamine N-acetyltransferases
1Department of Biological Sciences, Middle East Technical University, Ankara, Turkey.
Summary
Sheep arylamine N-acetyltransferases (NATs) were measured in liver, kidney, and lung. These enzymes showed stability and were inhibited by N-ethylmaleimide, suggesting potential roles in xenobiotic metabolism.
Area of Science:
- Biochemistry
- Pharmacology
- Animal Science
Background:
- Arylamine N-acetyltransferases (NATs) are crucial enzymes involved in the metabolism of various xenobiotics.
- Understanding NAT activity in different tissues is important for assessing drug efficacy and toxicity.
Purpose of the Study:
- To characterize the activity and properties of acetyl coenzyme A-dependent arylamine N-acetyltransferases (NATs) in sheep tissues.
- To investigate the kinetic parameters, stability, and inhibition of sheep NAT enzymes.
Main Methods:
- Enzyme activity assays using p-aminobenzoic acid (PABA) as a substrate in sheep liver, kidney, and lung tissues.
- Determination of kinetic parameters (Km), optimal pH, enzyme stability under storage conditions, and inhibition by N-ethylmaleimide.
Main Results:
- Specific NAT activities were quantified in liver, kidney, and lung tissues.
- Kinetic parameters (Km) varied across tissues, with optimal pH at 7.5.
- Sheep NAT enzymes demonstrated significant heat stability and stability during prolonged storage at -70°C.
- N-ethylmaleimide was identified as a potent inhibitor of these enzymes.
Conclusions:
- Sheep tissues exhibit distinct arylamine N-acetyltransferase activities.
- The characterized NAT enzymes possess favorable stability and are susceptible to inhibition, indicating their potential significance in xenobiotic metabolism and drug interactions in sheep.