Monday, June 28, 2021

Site-selective tyrosine bioconjugation via photoredox catalysis for native-to-bioorthogonal protein transformation

Beryl X. Li, Daniel K. Kim, Steven Bloom, Richard Y.-C. Huang, Jennifer X. Qiao, William R. Ewing, Daniel G. Oblinsky, Gregory D. Scholes & David W. C. MacMillan

Nat. Chem. (2021). 

DOI https://doi.org/10.1038/s41557-021-00733-y

The growing prevalence of synthetically modified proteins in pharmaceuticals and materials has exposed the need for efficient strategies to enable chemical modifications with high site-selectivity. While genetic engineering can incorporate non-natural amino acids into recombinant proteins, regioselective chemical modification of wild-type proteins remains a challenge. Herein, we use photoredox catalysis to develop a site-selective tyrosine bioconjugation pathway that incorporates bioorthogonal formyl groups, which subsequently allows for the synthesis of structurally defined fluorescent conjugates from native proteins. A water-soluble photocatalyst, lumiflavin, has been shown to induce oxidative coupling between a previously unreported phenoxazine dialdehyde tag and a single tyrosine site, even in the presence of multiple tyrosyl side chains, through the formation of a covalent C–N bond. A variety of native proteins, including those with multiple tyrosines, can successfully undergo both tyrosine-specific and single-site-selective labelling. This technology directly introduces aldehyde moieties onto native proteins, enabling rapid product diversification using an array of well-established bioorthogonal functionalization protocols including the alkyne–azide click reaction.




Covalent drug discovery using sulfur(VI) fluoride exchange warheads

Huang Huang, Lyn H. Jones Expert Opinion on Drug Discovery , 2023 https://doi.org/10.1080/17460441.2023.2218642 Covalent drug discovery has ...