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Halomethyl-Triazoles for Rapid, Site-Selective Protein Modification
Richard C Brewster1, Alison N Hulme1
1EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, UK.
Molecules (Basel, Switzerland)
|September 28, 2021
Summary
New reagents selectively mimic protein modifications by targeting cysteine residues. These triazole-based compounds offer improved reactivity and expand the range of post-translational modification mimics for biochemical studies.
Area of Science:
- Biochemistry
- Chemical Biology
- Proteomics
Background:
- Post-translational modifications (PTMs) regulate protein function but are challenging to study due to difficulties in selective introduction.
- Current chemical reagents often misrepresent natural PTMs by using separate warheads and linkers.
- Previous work established biotin-chloromethyl-triazole as a cysteine-modifying reagent mimicking lysine acylation.
Purpose of the Study:
- To enhance the reactivity of alkylating reagents for PTM mimicry.
- To broaden the scope of triazole-based PTM mimics.
- To develop selective reagents for studying protein modifications.
Main Methods:
- Synthesis of novel iodomethyl-triazole reagents.
- Selective modification of cysteine residues in histone proteins.
- Assessment of reagent reactivity with folded proteins like SCP-2L.
Main Results:
- Iodomethyl-triazole reagents demonstrated increased reactivity and selectivity for cysteine modification.
- Histone proteins were modified within 30 minutes, yielding PTM mimics of acylated lysine.
- Promising reactivity was observed with SCP-2L, alongside potential alkylation of methionine residues.
Conclusions:
- Novel halomethyl-triazole reagents offer enhanced capabilities for selective protein modification.
- These reagents provide valuable tools for creating PTM mimics, advancing the study of protein regulation.
- Further investigation is needed to fully characterize the reactivity profile, including potential off-target modifications.
