Tunable heteroaromatic azoline thioethers (HATs) for cysteine profiling.

Tunable heteroaromatic azoline thioethers (HATs) for cysteine profiling.
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DOI:
10.1039/d1sc04139h
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发表时间:
2022-01-19
期刊:
影响因子:
8.4
通讯作者:
Raj M
Raj M
中科院分区:
化学1区
文献类型:
--
作者:
Tang KC;Maddox SM;Backus KM;Raj M

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Here we report a new series of hydrolytically stable chemotype heteroaromatic azoline thioethers (HATs) to achieve highly selective, rapid, and efficient covalent labeling of cysteine under physiological conditions. Although the resulting cysteine–azoline conjugate is stable, we highlight traceless decoupling of the conjugate to afford unmodified starting components in response to reducing conditions. We demonstrated that HAT probes reverse the reactivity of nucleophilic cysteine to electrophilic dehydroalanine (Dha) under mild basic conditions. We demonstrated the umpolung capability of HAT probes for the modification of cysteine on peptides and proteins with various nucleophiles. We demonstrated that HAT probes increase the mass sensitivity of the modified peptides and proteins by 100 fold as compared to the classical methods. Finally, we extended the application of HAT probes for specific modification of cysteines in a complex cell lysate mixture. Here we report a new series of hydrolytically stable chemotype heteroaromatic azoline thioethers (HATs) to achieve highly selective, rapid, and efficient covalent labeling of cysteine under physiological conditions.
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