Journal
JOURNAL OF MEDICINAL CHEMISTRY
Volume 56, Issue 4, Pages 1443-1454Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jm301306c
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Takeda Memorial Foundation
- Grants-in-Aid for Scientific Research [24590142, 10J10645, 23659058, 24659028] Funding Source: KAKEN
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Substrate-selective inhibition or modulation of the activity of gamma-secretase, which is responsible for the generation of amyloid-beta peptides, might be an effective strategy for prevention and treatment of Alzheimer's disease. We have shown that helical beta-peptide foldamers are potent and specific inhibitors of gamma-secretase. Here we report identification of target site of the foldamers by using a photoaffinity probe. The photoprobe directly and specifically labeled the N-terminal fragment of presenilin 1, in which the initial substrate docking site is predicted to be located. We also optimized the foldamer structure by preparing a variety of derivatives and obtained two highly potent foldamers by incorporation of a hydrophilic and neutral functional group into the parent structure. The class of side chain functional group and the position of incorporation were both important for gamma-secretase-inhibitory activity. The substrate selectivity of the inhibitory activity was also quite sensitive to the class of side chain group incorporated.
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