Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 19, Pages 7350-7355Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202003631
Keywords
bioconjugation; bioorthogonal chemistry; lyases; Michael addition; protein modification
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Bacterial phosphothreonine lyases, or phospholyases, catalyze a unique post-translational modification that introduces dehydrobutyrine (Dhb) or dehydroalanine (Dha) in place of phosphothreonine or phosphoserine residues, respectively. We report the use of a phospha-Michael reaction to label proteins and peptides modified with Dha or Dhb. We demonstrate that a nucleophilic phosphine probe is able to modify Dhb-containing proteins and peptides that were recalcitrant to reaction with thiol or amine nucleophiles under mild aqueous conditions. Furthermore, we used this reaction to detect multiple Dhb-modified proteins in mammalian cell lysates, including histone H3, a previously unknown target of phospholyases. This method should prove useful for identifying new phospholyase targets, profiling the biomarkers of bacterial infection, and developing enzyme-mediated strategies for bioorthogonal labeling in living cells.
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