Journal
ANALYTICAL CHEMISTRY
Volume 92, Issue 13, Pages 9322-9329Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c01643
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Funding
- University Grants Committee of Hong Kong [14306317, N_CUHK422/18, 14307218]
- CUHK RSFS grant
- National Natural Science Foundation of China [21871301]
- Research Committee at University of Macau [MYRG2019-00059-ICMS]
- University Research Facility in Chemical and Environmental Analysis (UCEA) of Polytechnic University of Hong Kong
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Protein-protein interactions drive self-assembly of biomacromolecules and thus enable important physiological functions at a cellular level. Supramolecular chemists have developed artificial host-guest interactions that are similar with, yet distinct from and orthogonal to, the natural protein-protein interactions. For instance, cucurbit[n]urils are synthetic receptors that can specifically recognize proteins with N-terminal aromatic residues with high affinities, yet this interaction can be reversed by the competition of small molecules such as amantadine. Herein, we develop a site-specific, oriented protein-display method by combining the host-guest interaction based on cucurbit[7]uril and a covalent protein-peptide reaction. A methyllysine-binding protein HP1 beta chromodomain (CD) is immobilized via host-guest interactions and used as the bait to capture methyllysine proteomes from cancer cells. The captured fish-methyllysine-containing proteins-can be released via competitive displacement by amantadine in a nondenaturing and traceless manner. This affinity purification method found 73 novel methyllysine sites from 101 identified sites among 66 methylated proteins from 255 HP1 beta CD-binding proteins in cancer cells via subsequent mass spectrometric analysis. This work thereby presents a new strategy of artificial host-guest protein assembly in affinity purification of methyllysine proteins in coupling to mass spectrometry.
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