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• W2046185660 startingPage "1946" @default.
• W2046185660 abstract "Addition chemistries are widely used in preparing biological conjugates, and in particular, maleimide–thiol adducts have been widely employed. Here, we show that the resulting succinimide thioether formed by the Michael-type addition of thiols to N-ethylmaleimide (NEM), generally accepted as stable, undergoes retro and exchange reactions in the presence of other thiol compounds at physiological pH and temperature, offering a novel strategy for controlled release. Model studies (1H NMR, HPLC) of NEM conjugated to 4-mercaptophenylacetic acid (MPA), N-acetylcysteine, or 3-mercaptopropionic acid (MP) incubated with glutathione showed half-lives of conversion from 20 to 80 h, with extents of conversion from 20% to 90% for MPA and N-acetylcysteine conjugates. After ring-opening, the resultant succinimide thioether did not show retro and exchange reactions. The kinetics of the retro reactions and extent of exchange can be modulated by the Michael donor’s reactivity; therefore, the degradation of maleimide–thiol adducts could be tuned for controlled release of drugs or degradation of materials at time scales different than those currently possible via disulfide-mediated release. Such approaches may find a new niche for controlled release in reducing environments relevant in chemotherapy and subcellular trafficking." @default.
• W2046185660 created "2016-06-24" @default.
• W2046185660 creator A5041960921 @default.
• W2046185660 creator A5081116859 @default.
• W2046185660 date "2011-09-26" @default.
• W2046185660 modified "2023-10-16" @default.
• W2046185660 title "Tunable Degradation of Maleimide–Thiol Adducts in Reducing Environments" @default.
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• W2046185660 doi "https://doi.org/10.1021/bc200148v" @default.
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