Site-Specific Bioconjugation Reveals Norepinephrinylation as a Widespread Post-Translational Modification Regulating
Biorxiv : the Preprint Server for Biology
|June 29, 2026
Summary
Norepinephrine (NE) modification of proteins, or NEylation, is a newly discovered regulatory mechanism. A novel bioorthogonal reaction allows researchers to detect and study NEylation, revealing its widespread impact on protein function.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Norepinephrine (NE) is a crucial neurotransmitter and hormone.
- Beyond receptor signaling, NE induces protein post-translational modifications (PTMs), including NEylation.
- Existing detection methods for NEylation are limited, hindering research into its roles.
Purpose of the Study:
- To develop a novel bioorthogonal reaction for selective labeling and enrichment of the NEylation proteome.
- To enable fluorescence imaging and chemical proteomic profiling of NEylated proteins.
- To investigate the biochemical basis and pathophysiological roles of NEylation.
Main Methods:
- Development of a bioorthogonal reaction based on acid-catalyzed dehydration and 1,6-addition to thiol probes.
- Application of the reaction for selective labeling and enrichment of NEylated proteins in cell lines and tissues.
- Utilizing fluorescence imaging and chemical proteomic profiling to analyze the NEylation proteome.
Main Results:
- Successfully established a bioorthogonal reaction for NEylation detection.
- Demonstrated the widespread nature of NEylation across cellular proteomes.
- Revealed that NEylation impacts the enzymatic activities of modified proteins, exemplified by PTPN11.
Conclusions:
- NEylation is a significant and widespread protein post-translational modification.
- The developed bioorthogonal reaction provides a powerful tool for studying NEylation.
- NEylation plays a role in regulating protein function, with implications for physiological and pathological processes.
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