acids can mimic PTMs. However, reversible SPMs at hydrophobic amino acid residues in proteins are especially limited. Here, we report a tyrosine (Tyr)-selective SPM utilizing persistent iminoxyl radicals, which are readily generated from sterically hindered oximes via single-electron oxidation. The reactivity of iminoxyl radicals with Tyr was dependent on the steric and electronic demands of oximes;
least one of the templating groups in the product. In this report, we describe a traceless, templated amide-formingligation that proceeds at low micromolar concentration under aqueous conditions in the presence of biomolecules. We utilized the unique features of an acylboronate-hydroxylamine ligation, in which covalent bonds are broken in each of the reactants as the new amide bond is formed. By using
A Vinylogous Photocleavage Strategy Allows Direct Photocaging of Backbone Amide Structure
作者:Alicia E. Mangubat-Medina、Samuel C. Martin、Kengo Hanaya、Zachary T. Ball
DOI:10.1021/jacs.8b04893
日期:2018.7.11
folding and function. Here, we describe a new photocaging method using histidine-directed backbone modification to selectively modify peptides and proteins at the amide N-H bond. A new vinylogous photocleavage method allows photorelease of the backbone modification and, with it, restoration of function.