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Rat kidney histamine N-methyltransferase: purification and partial characterization
Preparative Biochemistry
|January 1, 1985
Summary
Rat kidney histamine N-methyltransferase (HMT) was purified to homogeneity. This enzyme plays a key role in histamine metabolism, and its properties are similar to the guinea pig enzyme.
Area of Science:
- Biochemistry
- Enzymology
- Pharmacology
Background:
- Histamine N-methyltransferase (HMT) is crucial for histamine metabolism.
- Understanding HMT's properties is vital for pharmacological research.
Purpose of the Study:
- To purify and characterize histamine N-methyltransferase (HMT) from rat kidney.
- To compare the properties of rat kidney HMT with other species.
Main Methods:
- Purification involved differential centrifugation, adsorption, and affinity chromatography.
- Enzyme homogeneity, molecular weight, and isoelectric point were determined.
- Kinetic parameters (Km and Ki) were measured for HMT substrates and inhibitors.
Main Results:
- HMT was purified 8,420-fold with 44% yield, yielding a homogeneous protein.
- The enzyme exhibited an apparent molecular weight of 31,500 and an isoelectric point of 5.4.
- Kinetic analysis revealed specific Km and Ki values for substrates and inhibitors, indicating high affinity.
Conclusions:
- Rat kidney HMT was successfully purified and characterized.
- The enzyme's physico-chemical and catalytic properties are comparable to guinea pig HMT.
- These findings contribute to understanding HMT's role in histamine metabolism and potential drug development.