A Water-Soluble Iridium Photocatalyst for Chemical Modification of Dehydroalanines in Peptides and Proteins

Roos C. W. van Lier, A. Dowine de Bruijn, Gerard Roelfes*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

1 Citaat (Scopus)
29 Downloads (Pure)


Dehydroalanine (Dha) residues are attractive non-canonical amino acids that occur naturally in ribosomally synthesised and post-translationally modified peptides (RiPPs). Dha residues are attractive targets for selective late-stage modification of these complex biomolecules. In this work, we show the selective photocatalytic modification of dehydroalanine residues in the antimicrobial peptide nisin and in the proteins Small Ubiquitin-like Modifier (SUMO) and superfolder Green Fluorescent Protein (sfGFP). For this purpose, a new water-soluble iridium(III) photoredox catalyst was used. The design and synthesis of this new photocatalyst, [Ir(dF(CF3 )ppy)2 (dNMe3 bpy)]Cl3, is presented. In contrast to commonly used iridium photocatalysts, this complex is highly water-soluble and allows modification of peptides and proteins in water and aqueous solvents under physiologically relevant conditions and with short reaction times and low reagent and catalyst loadings. This work suggests that photoredox catalysis using this newly designed catalyst is a promising strategy to modify dehydroalanine-containing natural products and thus may have great potential for novel bioconjugation strategies.

Originele taal-2English
Pagina's (van-tot)1430-1437
Aantal pagina's8
Nummer van het tijdschrift4
Vroegere onlinedatum8-sep-2020
StatusPublished - 18-jan-2021

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