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A novel tyrosine hyperoxidation enables selective peptide cleavage

A novel tyrosine hyperoxidation enabling selective peptide cleavage is reported. The scission of the N-terminal amide bond of tyrosine was achieved with Dess-Martin periodinane under mild conditions, generating a C-terminal peptide fragment bearing the unprecedented hyperoxidized tyrosine motif, 4,5...

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Published in:Chemical science (Cambridge) 2022-03, Vol.13 (9), p.2753-2763
Main Authors: Zhang, Shengping, De Leon Rodriguez, Luis M, Li, Freda F, Huang, Renjie, Leung, Ivanhoe K H, Harris, Paul W R, Brimble, Margaret A
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cited_by cdi_FETCH-LOGICAL-c336t-b4692333191539e11f1ec5b9178d7df8eb31155794b94a2613c5b6924f942d423
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container_title Chemical science (Cambridge)
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creator Zhang, Shengping
De Leon Rodriguez, Luis M
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Brimble, Margaret A
description A novel tyrosine hyperoxidation enabling selective peptide cleavage is reported. The scission of the N-terminal amide bond of tyrosine was achieved with Dess-Martin periodinane under mild conditions, generating a C-terminal peptide fragment bearing the unprecedented hyperoxidized tyrosine motif, 4,5,6,7-tetraoxo-1 -indole-2-carboxamide, along with an intact N-terminal peptide fragment. This reaction proceeds with high site-selectivity for tyrosine and exhibits broad substrate scope for various peptides, including those containing post-translational modifications. More importantly, this oxidative cleavage was successfully applied to enable sequencing of three naturally occurring cyclic peptides, including one depsipeptide and one lipopeptide. The linearized peptides generated from the cleavage reaction significantly simplify cyclic peptide sequencing by MS/MS, thus providing a robust tool to facilitate rapid sequence determination of diverse cyclic peptides containing tyrosine. Furthermore, the highly electrophilic nature of the hyperoxidized tyrosine unit disclosed in this work renders it an important electrophilic target for the selective bioconjugation or synthetic manipulation of peptides containing this unit.
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subjects AC generators
Chemistry
Cleavage
Peptides
Selectivity
Substrates
Tyrosine
title A novel tyrosine hyperoxidation enables selective peptide cleavage
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