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Updated: Mar 3, 2026
Spatial and Temporal Analysis of Active ERK in the C. elegans Germline
Published on: November 29, 2016
Visualization of Endogenous ERK1/2 in Cells with a Bioorthogonal Covalent Probe
James Sipthorp1, Honorine Lebraud2, Rebecca Gilley1
1Signalling Laboratory, The Babraham Institute , Babraham Research Campus, Cambridge CB22 3AT, U.K.
Abstract:
The RAS-RAF-MEK-ERK pathway has been intensively studied in oncology, with RAS known to be mutated in ∼30% of all human cancers. The recent emergence of ERK1/2 inhibitors and their ongoing clinical investigation demands a better understanding of ERK1/2 behavior following small-molecule inhibition. Although fluorescent fusion proteins and fluorescent antibodies are well-established methods of visualizing proteins, we show that ERK1/2 can be visualized via a less-invasive approach based on a two-step process using inverse electron demand Diels-Alder cycloaddition. Our previously reported trans-cyclooctene-tagged covalent ERK1/2 inhibitor was used in a series of imaging experiments following a click reaction with a tetrazine-tagged fluorescent dye. Although limitations were encountered with this approach, endogenous ERK1/2 was successfully imaged in cells, and "on-target" staining was confirmed by over-expressing DUSP5, a nuclear ERK1/2 phosphatase that anchors ERK1/2 in the nucleus.
Insights
Researchers developed a novel, less-invasive method to visualize Extracellular signal-Regulated Kinase 1/2 (ERK1/2) in cancer cells. This technique uses click chemistry to track ERK1/2 activity, offering new insights into targeted cancer therapies.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- The RAS-RAF-MEK-ERK pathway is crucial in cancer, with RAS mutations found in approximately 30% of human cancers.
- Understanding ERK1/2 behavior during small-molecule inhibition is vital due to emerging ERK1/2 inhibitors in clinical trials.
Purpose of the Study:
- To develop and validate a less-invasive method for visualizing endogenous ERK1/2.
- To assess the utility of click chemistry for tracking ERK1/2 in cellular imaging.
Main Methods:
- Utilized a two-step inverse electron demand Diels-Alder cycloaddition (click chemistry).
- Employed a previously developed trans-cyclooctene-tagged covalent ERK1/2 inhibitor.
- Performed imaging experiments using a tetrazine-tagged fluorescent dye.
Main Results:
- Successfully visualized endogenous ERK1/2 in cells.
- Confirmed "on-target" staining by over-expressing DUSP5, a nuclear ERK1/2 phosphatase.
- Identified limitations encountered during the imaging process.
Conclusions:
- The developed click chemistry approach enables visualization of endogenous ERK1/2.
- This method provides a less-invasive alternative to traditional protein visualization techniques.
- Further optimization is needed, but the approach shows promise for studying ERK1/2 in cancer research.
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