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Bioorthogonal Tools for Ethanolamine Lipids and Protein Conjugates
Yuan-Ting Cho1,2, Cindy Y Jao3, Zijun Xia1,2
1Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, New York, USA.
Angewandte Chemie (International Ed. in English)
|August 6, 2026
Summary
Researchers developed a new bioorthogonal probe, alkyne-ethanolamine (AlkEA), to label phosphatidylethanolamine (PE) and its related protein modifications. This tool aids in studying PE metabolism and its crucial roles in cellular processes like autophagy.
Area of Science:
- Biochemistry
- Cell Biology
- Chemical Biology
Background:
- Phosphatidylethanolamine (PE) is vital for eukaryotic membranes and protein modifications like ubiquitin and ATG8/LC3 conjugates, and GPI anchors.
- Bioorthogonal chemistry enables phospholipid studies, but a probe for endogenous PE and its modifications was lacking.
Purpose of the Study:
- To develop and validate a novel bioorthogonal probe for labeling endogenous phosphatidylethanolamine (PE).
- To investigate the utility of this probe in studying PE metabolism and PE-dependent protein modifications.
Main Methods:
- Introduction of an alkyne-tagged ethanolamine analog (AlkEA) incorporated into PE via the Kennedy pathway.
- Utilizing copper-catalyzed azide-alkyne cycloaddition (CuAAC) for visualization and affinity enrichment of labeled PE.
- Confocal microscopy and lipidomic analysis to determine subcellular localization and incorporation of AlkEA.
Main Results:
- AlkEA was successfully incorporated into PE and visualized in various cellular compartments including the ER, Golgi, mitochondria, and autophagosomes.
- Lipidomic analysis confirmed AlkEA incorporation across diverse PE species.
- AlkEA enabled affinity isolation of PE-conjugated LC3, ubiquitin, and a GPI-anchored protein.
Conclusions:
- AlkEA is a minimally perturbing tool for studying phosphatidylethanolamine (PE) metabolism.
- This probe is broadly applicable for dissecting PE-dependent protein modifications, including those in autophagy and cell surface protein anchoring.
