Z-Leu-Leu-Glu-AMC (LLE-AMC)

Catalog number: SBB-PS0006, 2 mg

Z-LLE-AMC is a fluorogenic peptidyl substrate for measuring caspase-like activity of the proteasome. Hydrolysis of this substrate by the β1 subunit of the 20S proteasome is monitored by observing fluorescence at an Excitation wavelength of 345nm and Emission at 445nm. [1][2][3]

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Z-LLE-AMC (Carboxybenzyl-Leu-Leu-Glu-AMC) is a 7-amino-4-methylcoumarin labeled fluorogenic peptidyl substrate hydrolyzed by the β1 subunit of the 20S proteasome. Peptidylglutamyl-peptide hydrolyzing (Caspase-like) activity can be measured using a working concentration of 20-50μM substrate. This substrate is specific to the constitutive proteasome, and is not hydrolyzed efficiently by the immunoproteasome. Cleavage of this peptide by the proteasome or other enzymes liberates the fluorophore AMC causing a strong fluorescent signal which is detected at an Excitation wavelength of 345nm and Emission wavelength of 445nm. 20S Proteasome enzyme requires activation with 0.035% SDS in the assay buffer.

For Research Use Only, Not For Use In Humans.


Product Overview
Quantity: 2.0 mg
Molecular Weight: 644.8 Da
Purity: >99% by HPLC
Readout: Endpoint / Kinetic
Label or Dye: 7-Amino-4-methylcoumarin
Detection Method: Fluorescence
Substrate Properties: Protein-Based Substrate, C35H44N4O9 , Cas# 348086-66-8
Excitation/Emission (nm): 345/445
Storage Buffer: Lyophilized
Storage Store at 4°C after product arrival. After preparing a stock in DMSO ( ≥10 mM) store product at -20°C to −80°C. It is recommended to make multiple aliquots after the first thaw to ensure best performance.

Figures & Data


Figure 1. Z-LLE-AMC, Chemical Structure.
Structure of Z-LLE-AMC, Cas# 348086-66-8.

Immunoproteasome Activity

Figure 2. 20S Immunoproteasome vs. 20S Constitutive Proteasome Activity.
LLE-AMC exhibits a high specific activity and preference for 20S constitutive proteasome compared to 20S immunoproteasome.

Certificates of Analysis (COA)

Citations & References

1) Kisselev, Alexei F., and Alfred L. Goldberg. "Monitoring activity and inhibition of 26S proteasomes with fluorogenic peptide substrates." Methods in enzymology 398 (2005): 364-378.

2) M. Orlowski, C. Cardozo, M. C. Hidalgo, et al. Regulation of the peptidylglutamyl-peptide hydrolyzing activity of the pituitary multicatalytic proteinase complex. Biochem. 30(24), 5999-6005 (1991).

3) Purification and characterization of a Z-Leu-Leu-Leu-MCA degrading protease expected to regulate neurite formation: a novel catalytic activity in proteasome.: S. Tsubuki et al.; Biochem. Biophys. Res. Commun. 196, 1195 (1993)