Methyltransferase Enzymes
Methyltransferase Enzymes - Related Videos
12:36
In vitro tRNA Methylation Assay with the Entamoeba histolytica DNA and tRNA Methyltransferase Dnmt2 (Ehmeth) Enzyme
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Cited by 20 •
2010
This protocol describes the preparation of a synthetic tRNA substrate for the Entamoeba histolytica DNA/tRNA methyltransferase 2 (Dnmt2) homolog Ehmeth and the measure of its methyltransferase activity. This experimental approach can be used for investigating the activity of other Dnmt2 proteins.
01:27
Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
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2026
Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...
09:33
In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity
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Cited by 2 •
2016
The present report describes an in vitro enzymatic assay to measure phosphatidylethanolamine methyltransferase activity using Leishmania cell extracts. This assay is based on the transfer of a radioactive methyl group from S-[Methyl-3H]adenosyl-L-methionine onto endogenous phosphatidylethanolamine.
02:34
Enzymes
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2020
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions. Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
17:12
Profiling of Methyltransferases and Other S-adenosyl-L-homocysteine-binding Proteins by Capture Compound Mass Spectrometry (CCMS)
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Cited by 13 •
2010
Capture Compounds are trifunctional small molecules to reduce the complexity of the proteome by functional reversible small molecule-protein interaction followed by photo-crosslinking and purification. Here we use a Capture Compound with S-adenosyl-L-homocysteine-binding as selectivity function to isolate methyltransferases from an Escherichia coli whole cell lysate and identify them by MS.
FAQs
Specificity depends on how the active site recognizes a particular substrate and positions it with the methyl donor. Because methyltransferases can act on DNA, RNA, proteins, lipids, or small molecules, each enzyme-substrate pairing can produce a different molecular consequence. This selectivity helps explain why individual enzymes may influence distinct aspects of cellular function and disease biology.
S-adenosyl-L-methionine supplies the methyl group that is transferred during the reaction. The active site brings this donor together with the selected substrate and aligns them for modification of a target atom. This coordinated arrangement links donor availability, substrate recognition, and catalytic activity, allowing methylation to alter the molecular behavior of the modified target.
DNA and histone methylation can change how genetic information is regulated, so altered activity of the corresponding methyltransferases may affect gene expression. This is clinically important because abnormal methylation patterns can accompany cancer, developmental disorders, and other diseases. Studying these changes helps connect enzyme activity with altered cellular programs rather than viewing methylation as an isolated chemical event.
The biological meaning of methylation depends strongly on whether the target is DNA, RNA, a protein, a lipid, or a small molecule. Modification of different substrate classes can change different aspects of molecular activity and cellular function. Consequently, clinical interpretation requires identifying both the enzyme involved and the substrate whose methylation has changed.
Clinical research examines methyltransferase activity and associated methylation changes in relation to gene expression, disease states, and cellular function. DNA and histone methyltransferases receive particular attention because their altered regulation is linked with cancer, developmental disorders, and other diseases. These investigations can connect molecular changes with disease classification and potential therapeutic strategies.
Altered methylation can provide molecular features that help distinguish disease states or characterize disease biology. In clinical research, researchers study these patterns as potential biomarkers and relate them to changes in gene regulation and cellular function. Such information may support disease classification and help identify patients or disease contexts relevant to targeted therapeutic development.
Selective inhibitors are designed to reduce the activity of particular methyltransferases rather than broadly affecting methylation processes. Their development is relevant when abnormal enzyme activity contributes to disease-associated molecular changes. In clinical research, these compounds support investigation of causal mechanisms and may contribute to precision therapies tailored to specific disease features or methyltransferase-related alterations.