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Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells

Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells

Published on: April 9, 2018

Fluorogenic protein labeling using a genetically encoded unstrained alkene.

X Shang¹, X Song¹, C Faller¹

¹Department of Chemistry , University of Nebraska-Lincoln , Lincoln , NE 68588 , USA .

Chemical Science

|April 29, 2017

Summary

This summary is machine-generated.

Researchers created a novel fluorogenic bioorthogonal reaction using styrene and tetrazine. This method enables site-specific protein labeling in live cells for studying protein folding and function.

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Area of Science:

Chemical Biology
Organic Chemistry
Biochemistry

Background:

Bioorthogonal reactions are crucial for studying biological systems in situ.
Existing methods often face limitations in fluorogenicity, specificity, or background fluorescence.
Developing novel bioorthogonal reactions with enhanced properties is essential for advancing chemical biology.

Purpose of the Study:

To develop a new fluorogenic bioorthogonal reaction for site-specific protein labeling.
To create a novel fluorophore through an inverse electron-demand Diels-Alder reaction.
To demonstrate the utility of this reaction in labeling proteins within live cells.

Main Methods:

Utilized an inverse electron-demand Diels-Alder reaction between styrene and tetrazine to form a new fluorophore.
Identified and employed an aminoacyl-tRNA synthetase/tRNA pair for site-specific incorporation of a styrene-containing amino acid into proteins.
Demonstrated fluorogenic labeling of purified proteins and proteins within intact live cells.

Main Results:

Successfully developed a novel fluorogenic bioorthogonal reaction with no literature precedent.
Achieved efficient and site-specific incorporation of a styrene-containing amino acid into proteins.
Demonstrated successful fluorogenic labeling in both purified proteins and live cells, showing low background fluorescence.

Conclusions:

The developed styrene-tetrazine reaction offers a new, fluorogenic approach for bioorthogonal chemistry.
This method allows for site-specific protein labeling and has potential applications in studying protein folding and function under physiological conditions.
The low background fluorescence interference makes this reaction highly suitable for complex biological studies.