期刊
NATURE CHEMISTRY
卷 11, 期 4, 页码 310-319出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41557-018-0209-2
关键词
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资金
- National Natural Science Foundation of China [21522402, 11674153, 11374148, 21774057, 11334004]
- Fundamental Research Funds for the Central Universities [020414380080]
Maleimide-thiol reactions are widely used to produce protein-polymer conjugates for therapeutics. However, maleimide-thiol adducts are unstable in vivo or in the presence of thiol-containing compounds because of the elimination of the thiosuccinimide linkage through a retro-Michael reaction or thiol exchange. Here, using single-molecule force spectroscopy, we show that applying an appropriate stretching force to the thiosuccinimide linkage can considerably stabilize the maleimide-thiol adducts, in effect using conventional mechanochemistry of force-accelerated bond dissociation to unconventionally stabilize an adjacent bond. Single-molecule kinetic analysis and bulk structural characterizations suggest that hydrolysis of the succinimide ring is dominant over the retro-Michael reaction through a force-dependent kinetic control mechanism, and this leads to a product that is resistant to elimination. This unconventional mechanochemical approach enabled us to produce stable polymer-protein conjugates by simply applying a mechanical force to the maleimide-thiol adducts through mild ultrasonication. Our results demonstrate the great potential of mechanical force for stimulating important productive chemical transformations.
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