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Molecular basis for isoform-selective inhibition of presenilin-1 by MRK-560.


ABSTRACT: Inhibition of γ-secretase activity represents a potential therapeutic strategy for Alzheimer's disease (AD). MRK-560 is a selective inhibitor with higher potency for Presenilin 1 (PS1) than for PS2, the two isoforms of the catalytic subunit of γ-secretase, although the underlying mechanism remains elusive. Here we report the cryo-electron microscopy (cryo-EM) structures of PS1 and PS2-containing γ-secretase complexes with and without MRK-560 at overall resolutions of 2.9-3.4 Å. MRK-560 occupies the substrate binding site of PS1, but is invisible in PS2. Structural comparison identifies Thr281 and Leu282 in PS1 to be the determinant for isoform-dependent sensitivity to MRK-560, which is confirmed by swapping experiment between PS1 and PS2. By revealing the mechanism for isoform-selective inhibition of presenilin, our work may facilitate future drug discovery targeting γ-secretase.

SUBMITTER: Guo X 

PROVIDER: S-EPMC9587990 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Molecular basis for isoform-selective inhibition of presenilin-1 by MRK-560.

Guo Xuefei X   Wang Yumeng Y   Zhou Jiayao J   Jin Chen C   Wang Jiaoni J   Jia Bojun B   Jing Dan D   Yan Chuangye C   Lei Jianlin J   Zhou Rui R   Shi Yigong Y  

Nature communications 20221022 1


Inhibition of γ-secretase activity represents a potential therapeutic strategy for Alzheimer's disease (AD). MRK-560 is a selective inhibitor with higher potency for Presenilin 1 (PS1) than for PS2, the two isoforms of the catalytic subunit of γ-secretase, although the underlying mechanism remains elusive. Here we report the cryo-electron microscopy (cryo-EM) structures of PS1 and PS2-containing γ-secretase complexes with and without MRK-560 at overall resolutions of 2.9-3.4 Å. MRK-560 occupies  ...[more]

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