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Caspase-8 (human), (recombinant)

BML-SE172

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Highly active caspase-8 for the study of enzyme regulation and kinetics

Caspase-8 is an initiator caspase activated in the death-inducing signaling complexes (DISCs) of the TNF receptor superfamily (e.g. TRAIL, FasL, TNFα receptors).

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Caspase-8 (human), (recombinant) SDS-PAGE — SDS PAGE Analysis: Lane 1: MW Marker, Lane 2: 1µg (Prod. No. BML-SE172).

Product Details

Activity	100 U/µl
Alternative Name	FLICE, Mch5, MACH
Application Notes	Useful tool to study enzyme regulation and kinetics, cleave target substrates, screen for inhibitors.
Formulation	Liquid. In 50mM HEPES, pH 7.4, 100mM sodium chloride, 0.5% CHAPS, 1mM EDTA, 10% glycerol and 10mM DTT.
MW	18 + 11 kDa
Purity	≥90% (SDS-PAGE)
Source	Produced in E. coli
Specific Activity	One U=1 pmol/min using Ac-IETD-pNA (200mM; Prod. No. ALX-260-045) as substrate, at 30°C.
UniProt ID	Q14790

Handling & Storage

Use/Stability	After initial defrost, aliquot product into individual tubes and refreeze the remaining, unused enzyme quickly by snap-freezing in a dry/ice ethanol bath or liquid nitrogen, if possible. Avoid repeated freeze/defrost cycles.NOTE: When stored under the above conditions, this enzyme is stable at the concentration supplied, in its current storage buffer. Procedures such as dilution of the enzyme followed by refreezing, could lead to loss of activity.
Long Term Storage	-80°C
Shipping	Dry Ice

Regulatory Status	RUO – Research Use Only

A Potent Inhibitor of Caspase‑8 Based on the IL-18 Tetrapeptide Sequence Reveals Shared Specificities between Inflammatory and Apoptotic Initiator Caspases: C.M. Bourne, et al.; bioRxiv , 02.23.639785 (2025), Abstract — Full Text
GSDMEa-mediated pyroptosis is bi-directionally regulated by caspase and required for effective bacterial clearance in teleost: H. Xu, et al.; Cell Death Dis. 13, 491 (2022), Abstract
Caspase-10 affects the pathogenesis of primary biliary cholangitis by regulating inflammatory cell death: M. Cho, et al.; J. Autoimmun. 133, 102940 (2022), Abstract
Triple-FRET multi-purpose fluorescent probe for three-protease detection: D. Milićević, et al.; RSC Adv. 12, 28780 (2022), Abstract
Allosteric Regulation of BH3 Proteins in Bcl-xL Complexes Enables Switch-like Activation of Bax: Bogner, C., Kale, J., et al.; Mol. Cell 77, 901 (2020), Abstract
A Small-Molecule Inhibitor of Bax and Bak Oligomerization Prevents Genotoxic Cell Death and Promotes Neuroprotection: X. Nui, et al.; Cell Chem. Biol. 24, 493 (2017), Abstract
Approaches to design non-covalent inhibitors for human granzyme B (hGrB): M. Kim, et al.; Org. Biomol. Chem. 12, 8952 (2014), Abstract
Examining the molecular mechanism of bcl-2 family proteins at membranes by fluorescence spectroscopy: J. Kale, et al.; Methods Enzymol. 544, 1 (2014), Abstract

Related Products

Ac-IETD-pNA

ALX-260-045

Caspase and granzyme substrate

8 citations

Purity	≥95% (HPLC)

Datasheet, Manuals, SDS & CofA

Manuals And Inserts

Datasheet

Specific Protocol

Caspase-8 (FLICE/MACH/Mch5) Assay
Assay buffer
(50mM HEPES, pH 7.4, 100mM NaCl, 0.1% CHAPS, 1mM EDTA, 10% glycerol, 10mM DTT)
Caspase-8 (Prod. No. BML-SE172)
Dilute to 10 U/µl in assay buffer just before use.
Ac-IETD-pNA (Prod. No. ALX-260-045) colorimetric substrate
(400 µM stock solution in Assay buffer; Store at -20°C. Warm to assay temperature before use.)
To 5mg net peptide (MW=639) add 156µl DMSO, to prepare 50mM stock. Dilute 50mM stock to 400µM with Assay Buffer.
Reaction Conditions:
1) Add 45µl Assay buffer into 1/2 volume microtiter plate. Allow to equilibrate to assay temperature.
2) Add 5µl of caspase-8 (10U/µl) to each appropriate well. Include 2 blanks (5µl assay buffer rather than caspase-8).
3) To start reaction, add 50µl Ac-IETD-pNA substrate (400µM in assay buffer). Final substrate concentration=200µM.
4) Continuously monitor A_405nm.
5) Data analysis: Graph OD vs time and determine slope over the linear portion of the curve. Convert rates in OD/min to substrate/min using an extinction coefficient for p-nitroaniline of 10,500 M^-1cm^-1, and adjusting for pathlength of sample (~0.5cm for 100µl in well of a ½ volume, 96-well plate).

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