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Related Experiment Video

Updated: Mar 27, 2026

In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity
09:33

In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity

Published on: January 5, 2016

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In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity.

Rachel Zufferey1

  • 1Department of Biological Sciences, St John's University; zufferer@stjohns.edu.

Journal of Visualized Experiments : Jove
|January 19, 2016
PubMed
Summary

Researchers developed a simple cell-free assay to measure phosphatidylethanolamine methyltransferase activity. This method uses radiolabeled methyl groups and organic extraction to detect enzyme function in various cell types.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Cell Biology

Background:

  • Phosphatidylethanolamine methyltransferases (PEMT) are key biosynthetic enzymes involved in phospholipid metabolism.
  • These enzymes play crucial roles in cellular physiology, impacting conditions like insulin resistance, diabetes, and atherosclerosis.
  • PEMT enzymes are found across diverse organisms, including animals, fungi, and some bacteria.

Purpose of the Study:

  • To develop a straightforward, cell-free enzymatic assay for quantifying PEMT activity.
  • To enable the study of PEMT function and inhibition without enzyme purification.
  • To provide a versatile tool for investigating PEMT roles in various biological contexts.

Main Methods:

  • Utilized S-[Methyl-(3H)]adenosyl-L-methionine as a methyl group donor.
  • Employed whole cell extracts as the source of phosphatidylethanolamine methyltransferase enzymes.
  • Separated hydrophobic methylated phosphatidylethanolamine products from the water-soluble substrate via organic extraction.

Main Results:

  • Successfully established a cell-free assay to measure the transfer of tritiated methyl groups by PEMTs.
  • Demonstrated that hydrophobic methylated products can be effectively separated from the substrate.
  • Validated the assay's applicability to various cell types and its potential for drug screening.

Conclusions:

  • The developed cell-free assay offers a simple and efficient method for assessing PEMT activity.
  • This assay facilitates the study of PEMT function and the identification of specific inhibitors.
  • The method's versatility makes it valuable for research in lipid metabolism and related diseases.