Synlett
DOI: 10.1055/s-0042-1751571
letter
Chemical Tools for Peptide Modifications

Sulfonium-Based Activity-Based Probes for Lysine-Selective Protein Profiling under Alkaline Conditions

Changxing Hu
a   State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. of China
,
Rui Wang
b   Pingshan Translational Medicine Center, Shenzhen BayLaboratory, Shenzhen, 518118, P. R. of China
,
Yuhao An
b   Pingshan Translational Medicine Center, Shenzhen BayLaboratory, Shenzhen, 518118, P. R. of China
,
Chuan Wan
a   State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. of China
,
Feng Yin
b   Pingshan Translational Medicine Center, Shenzhen BayLaboratory, Shenzhen, 518118, P. R. of China
,
Fei Lu
a   State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. of China
,
Zigang Li
a   State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. of China
b   Pingshan Translational Medicine Center, Shenzhen BayLaboratory, Shenzhen, 518118, P. R. of China
› Author Affiliations
We acknowledge the financial support from the following. National Key R&D Program of China (No. 2018YFA0902504), Natural Science Foundation of China grants (22307084, 22307081, 21977010, 22107045), Guangdong Basic and Applied Basic Research Foundation (2022A1515010996), Shenzhen Science and Technology Program (JCYJ20230807151059004, JCYJ20220818095808019, RCJC20200714114433053, JCYJ201805081522131455, JCYJ20200109140406047, JCYJ20180507182427559), Science and Technology Program in Guangzhou (202102020214), Shenzhen People’s Hospital funds (SYKYPY201909), Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions (2023SHIBS0004), Shenzhen High-tech Zone Development Special Plan Pingshan District Innovation Platform Construction Project (29853MKCJ202300208), and Tian Fu Jin Cheng Laboratory (Advanced Medical Center) Group Racing Project (TFJC2023010008)


Abstract

Due to their strong nucleophilicities, nucleophilic lysine and cysteine residues can be easily recognized and modified by electrophilic groups, thus, acting as the targets for covalent ligands or drugs. Therefore, the development of site-specific protein-modification chemistry for various nucleophilic residues has been explored to label proteins selectively for many biological and therapeutic applications. In this study, we constructed a series of sulfonium-based small molecules to react with the amine group of lysine residues by utilizing the strong electrophilicity of sulfonium, resulting in lysine-selective labeling via the formation of classical amide bonds under alkaline conditions (pH 9.0–11.0). After systematic optimization of the labeling conditions, this strategy was utilized for protein labeling across various bacteria’s lysates. Finally, combined with the activity-based protein profiling (ABPP) strategy, we successfully identified and analyzed hundreds of labeled lysine residues in the bacterial proteome.

Supporting Information



Publication History

Received: 05 December 2023

Accepted after revision: 19 February 2024

Article published online:
01 March 2024

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