γ-Secretase Inhibitor X

A cell-permeable hydroxyethylene dipeptide isostere that acts as a potent and highly specific inhibitor of γ-secretase (Aβ total IC₅₀ = 17 nM; Aβ₄₀ IC₅₀ = 48 nM; and Aβ₄₂ IC₅₀ = 67 nM in SH-SY5Y cells overexpressing spβA4CTF). Binds to presenilin and blocks Notch intracellular domain production. Also reported to block the formation of εCTF, resulting in the accumulation of α- and βCTF. Functions as a transition state analog mimic at the catalytic site of an aspartyl protease, however, it exhibits over 100-fold greater selectivity for γ-secretase than for cathepsin D.

Cell permeable: yes

Primary Target
Aβ_total

Product does not compete with ATP.

Reversible: no

Target IC₅₀: Aβtotal 17 nM, Aβ40 48 nM, and Aβ42 67 nM in SHSY5Y cells overexpressing spβA4CTF

Packaged under inert gas

A 1 mM (250 µg in 372 µl or 500 µg in 744 µl) solution in DMSO.

Following initial thaw, aliquot and freeze (-20°C).

Weidemann, A., et al. 2002. Biochemistry41, 2825.
Doerfler, P., et al. 2001. Proc. Natl. Acad. Sci. USA98, 9312.
Li, Y.M., et al. 2000. Proc. Natl. Acad. Sci. USA97, 6138.
Shearman, M.S., et al. 2000. Biochemistry39, 8698.

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Toxicity: Standard Handling (A)