TF4-VAD-FMK

TF4-VAD is a red fluorescent cell-permeable polycaspase inhibitor to target caspases 1, 2, 3, 6, 8, 9, or 10. Once inside the cell, the inhibitor binds covalently to the active caspase, which produces a green fluorescence. When added to a population of cells, the TF4-VAD-FMK probe enters each cell and covalently binds to a reactive cysteine residue that resides on the large subunit of the active caspase heterodimer, thereby inhibiting further enzymatic activity. The bound labeled reagent is retained within the cell, while any unbound reagent will diffuse out of the cell and is washed away. The green fluorescent signal is a direct measure of the amount of active caspase present in the cell at the time the reagent was added. Cells that contain the bound labeled reagent can be analyzed by 96-well plate-based fluorometry, fluorescence microscopy, or flow cytometry. The probe has the spectral properties similar to Texas Red®, thus the filter set of Texas Red® can be conveniently used with a flow cytometer or microscope.

Protocol

SDS

COA

Catalog	Size	Price	Quantity
13471	25 Tests	Price

Calculators

Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of TF4-VAD-FMK to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

	0.1 mg	0.5 mg	1 mg	5 mg	10 mg
1 mM	113.894 µL	569.47 µL	1.139 mL	5.695 mL	11.389 mL
5 mM	22.779 µL	113.894 µL	227.788 µL	1.139 mL	2.278 mL
10 mM	11.389 µL	56.947 µL	113.894 µL	569.47 µL	1.139 mL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)		Molecular weight		Volume (Calculate)		Concentration (Calculate)		Moles
mg	÷	878.01 g/mol	=	mL	x	mM	=	mmol

References

View all 26 references: Citation Explorer

Suppression of human T cell proliferation by the caspase inhibitors, z-VAD-FMK and z-IETD-FMK is independent of their caspase inhibition properties

Authors:

Lawrence CP, Chow SC.

Journal:

Toxicol Appl Pharmacol. (2012)

Inhibition of elicitation of allergic contact dermatitis by topical use of Z-VAD-FMK, a broad caspase inhibitor: experiment in mice

Authors:

Li YY, Yan CL.

Journal:

Zhonghua Yi Xue Za Zhi (2012): 1992

Structure of human caspase-6 in complex with Z-VAD-FMK: New peptide binding mode observed for the non-canonical caspase conformation

Authors:

Muller I, Lamers MB, Ritchie AJ, Dominguez C, Munoz-Sanjuan I, Kiselyov A.

Journal:

Bioorg Med Chem Lett (2011): 5244

Intracochlear perfusion of leupeptin and z-VAD-FMK: influence of antiapoptotic agents on gunshot-induced hearing loss

Authors:

Abaamrane L, Raffin F, Schmerber S, Sendowski I.

Journal:

Eur Arch Otorhinolaryngol (2011): 987

Plasmodium falciparum metacaspase PfMCA-1 triggers a z-VAD-fmk inhibitable protease to promote cell death

Authors:

Meslin B, Beavogui AH, Fasel N, Picot S.

Journal:

PLoS One (2011): e23867

Physical properties

Molecular weight	878.01
Solvent	DMSO

Spectral properties

Correction factor (280 nm)	0.436
Extinction coefficient (cm ^-1 M ^-1)	90000
Excitation (nm)	577
Emission (nm)	602
Quantum yield	0.77 ¹

Storage, safety and handling

H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
Storage	Freeze (< -15 °C); Minimize light exposure
UNSPSC	12352200

Documents

Protocol
Safety Data Sheet
Certificate of Analysis

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Page updated on October 28, 2025