Shop All Enzyme Detection & Activity Assays

Phosphate Sensor

The Phosphate Sensor is a highly sensitive reagent for the detection of inorganic phosphate, either in real-time kinetic or end-point mode. This product is a purified form of recombinant E. coli phosphate-binding protein labeled with the fluorophore MDCC, which is sensitive to changes in its environment. Binding of inorganic phosphate by Phosphate Sensor is rapid and tight (Kd ~ 0.1 µM), resulting in a large increase in fluorescence. The Phosphate Sensor detects phosphate in the high-nanomolar to low-micromolar range, which is 100-fold more sensitive than malachite green. This reagent provides you with a sensitive assay for detecting enzymes that produce inorganic phosphate either directly or indirectly through coupled reactions, such as phosphatases, ATPases, GTPases, and phosphodiesterases.

Z'-LYTE™ Kinase Assay Kit - Tyrosine 1 Peptide

A coumarin and fluorescein-labeled peptide substrate which can be used for kinase screening in an antibody-free format. This peptide is based upon an optimal peptide substrate for SRC.

Kinase Tracer 236, 50 µM

In the LanthaScreen® Eu Kinase Binding Assay, binding of an Alexa Fluor® conjugate or “tracer" such as Kinase Tracer 236 to a kinase is detected by addition of a Eu-labeled anti-tag antibody. Binding of the tracer & antibody to a kinase results in a high degree of FRET, whereas displacement of the tracer with a kinase inhibitor results in a loss of FRET. Unlike many kinase activity assays, this assay is a simple mix and read assay, with no development steps. Learn More and See Which Kinases Have Been Validated Using This Assay

Kinase Tracer 314, 25 µM

In the LanthaScreen® Eu Kinase Binding Assay, binding of an Alexa Fluor® conjugate or “tracer" such as Kinase Tracer 314 to a kinase is detected by addition of a Eu-labeled anti-tag antibody. Binding of the tracer & antibody to a kinase results in a high degree of FRET, whereas displacement of the tracer with a kinase inhibitor results in a loss of FRET. Unlike many kinase activity assays, this assay is a simple mix and read assay, with no development steps. Learn More and See Which Kinases Have Been Validated Using This Assay

Butyrylcholinesterase Fluorescent Activity Kit (Invitrogen™)

The Butyrylcholinesterase Fluorescent Activity research-use-only kit is a fluorescent activity assay designed for the quantification and detection of butyrylcholinesterase activity in serum and plasma samples.

This complete, ready-to-use kit includes black 96-well plate(s), butyrylcholinesterase standard (200 mU/mL), butyrylcholinesterase substrate, and other components to perform the assay. A fluorescence 96-well microplate reader capable of reading fluorescent emission at 510 nm, with excitation at 390 nm, is required for use of this kit.

Performance characteristics
• Assay type: fluorescent activity kit
• Sample types: serum and plasma samples
• Sensitivity: 0.018 mU/mL
• Standard curve range: 0.3 mU/mL–20 mU/mL
• Reactivity: species independent

Background
Butyrylcholinesterase (BChE) belongs to the same structural class of proteins as acetylcholinesterase (AChE). The 440 kDa tetrameric glycoprotein is predominantly found in blood, kidneys, intestine, liver, lung, heart, and the central nervous system. Many species, such as human, horse, and mice exhibit high BChE activity in plasma, whereas rats have higher acetylcholinesterase activity in plasma1. BChE preferentially acts on butyrylcholine, but also hydrolyzes acetylcholine. This assay has been validated for serum, EDTA and heparin plasmas from a variety of species.
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Assay principle
The Butyrylcholinesterase Activity kit is designed to quantitatively measure butyrylcholinesterase (BChE) activity in a variety of samples. A human BChE standard is provided to generate a standard curve for the assay and all samples should be read off the standard curve. The kit utilizes a proprietary non-fluorescent detection reagent that covalently binds to the thiol product of the reaction between the BChE Substrate and BChE in the standards or samples, yielding a fluorescent product read at 510 nm in a fluorescent plate reader with excitation at 390 nm. The kit is suitable for measuring BChE activity in appropriately diluted serum or plasma from a number of species. It will also measure BChE in extracted tissue samples, CSF, and cell lysates.

BChE unit definition
One unit will hydrolyze 1.0 μmol of butyrylcholine to choline and butyrate per minute at pH 8.0 and 37˚C.

Related links
Learn more about ELISA kits
Learn more about other immunoassays

Gal-Screen™ β-Galactosidase Reporter Gene Assay System for Mammalian Cells (Invitrogen™)

The Gal-Screen® assay system combines direct cell lysis with rapid, ultra-sensitive chemiluminescent detection of β-galactosidase reporter enzyme.

• Homogeneous assay format allows detection of β-galactosidase in the presence of normal culture media without removal of media and without an additional cell lysis step, providing the easiest and most streamlined assay procedure possible.
• The kinetics of the glow-assay provides a "window" during which measurements may be performed, facilitating HTS applications where assay automation is used.
• Can be used with either mammalian or yeast model systems, providing flexibility in choice of model systems.
• Wide dynamic range of β-galactosidase assay enables accurate measurement of enzyme from femtogram to nanogram range.
• Assay sensitivity is 100 to 1,000-fold better than either the isotopic⁄non-isotopic assays for chloramphenicol acetyl transferase (CAT) or the colorimetric⁄fluorescent assays for β-galactosidase, providing greater sensitivity than competing assay technologies.
• Highly sensitive assay with a wide dynamic range permits detection of high and low levels of reporter without performing numerous sample dilutions.
• Non-radioactive reporter gene assay kit eliminates concerns over use of radioisotopes.
• Assay can be completed in about one hour, providing fast assay turnaround.

Ideal for Screening
This homogeneous assay is ideally suited for screening applications where assay automation is required. The Gal-Screen® system uses Galacton-Star® chemiluminescent substrate for convenient measurement in a luminometer. Light emission reaches maximum in 60-90 minutes and remains constant for 45-90 minutes.

For Research Use Only. Not for use in diagnostics procedures.

Z'-LYTE™ Kinase Assay Kit - Tyrosine 2 Peptide

A coumarin and fluorescein-labeled peptide substrate which can be used for kinase screening in an antibody-free format. This peptide is based upon an optimal peptide substrate for ABL.

Kinase Tracer 178, 25µM

In the LanthaScreen® Eu Kinase Binding Assay, binding of an Alexa Fluor® conjugate or “tracer" such as Kinase Tracer 178 to a kinase is detected by addition of a Eu-labeled anti-tag antibody. Binding of the tracer & antibody to a kinase results in a high degree of FRET, whereas displacement of the tracer with a kinase inhibitor results in a loss of FRET. Unlike many kinase activity assays, this assay is a simple mix and read assay, with no development steps. Learn More and See Which Kinases Have Been Validated Using This Assay

Pierce™ Gaussia-Firefly Luciferase Dual Assay Kit (Thermo Scientific™)

The Thermo Scientific Pierce Gaussia-Firefly Luciferase Dual Assay Kit provides the necessary reagents to simultaneously detect intracellular Gaussia and Red Firefly luciferase activity in mammalian whole cell lysates.

Features of the Gaussia-Firefly Luciferase Dual Assay Kit:

Simultaneous—concurrent, filter-based, wavelength-separated detection of two luciferase activities
Sensitive—measure bright blue Gaussia and red firefly luciferase activities in the same sample
Fast—no quenching step required, unlike in traditional sequential dual assays
Multiplex—capable of quantitating two cellular activities in the same sample(s)

The Pierce Gaussia-Firefly Luciferase Dual Assay Kit is a highly sensitive assay that allows for the simultaneous detection of Gaussia and Red Firefly luciferase activity. Gaussia luciferase acts as an experimental reporter with constitutively active red firefly as a normalization control. As shown in the animation videos below, this reporter-and-control combination enables simultaneous monitoring of experimental reporter and control luciferase activities in a single-read assay without the need for two-step addition of substrate reagents or quenching. The assay working solution contains substrates for both luciferases, and the reactions occur simultaneously with flash-type kinetics. The resulting luminescent signals are spectrally resolvable using filters. In a single sample, researchers can assay transcriptional activity of regulatory elements, signal transduction pathways, and effects of activators or inhibitors.

Includes:
Cell lysis buffer, reaction buffer, and substrates coelenterazine and D-luciferin

Requires:
Gaussia and Red Firefly luciferase reporters; Filter sets in the ranges of 425 to 525nm for Gaussia Luc and 615 to 675nm for Red Firefly Luc. Luminometer or other instrument capable of monitoring luminescence, such as Thermo Scientific Luminoskan Ascent and Varioskan Flash Microplate Readers; Injector required for assessing more than 24 wells at a time.

Applications:
• Study two regulatory elements at the same time
• Monitor two signaling pathways simultaneously
• Enable studying more than one target per screen (e.g. off-target effects)

Application Videos:
Gaussia luciferase produces brighter bioluminescent signal than firefly and native Renilla luciferases. The bioluminescent signal (λmax= 470nm) produced by Gaussia luciferase results from the oxidation of coelenterazine. This reaction does not require adenosine triphosphate (ATP) or other cofactors. Red firefly luciferase is a mutant form of the Japanese firefly luciferase from Luciola cruciata. This luciferase produces a red-shifted emission spectrum (λmax= 613nm) that results from the oxidation of D-luciferin in the presence of ATP. Red firefly and Gaussia luciferases are used in the dual assay because the light output is spectrally resolvable.

More Product Data
Highly sensitive multiplex luciferase reporter assays
Simultaneous dual-emission detection of luciferase reporter assays
Activation of the antioxidant response pathway by pesticide chemicals

Kinase Tracer 1710, 25 µM

In the LanthaScreen® Eu Kinase Binding Assay, binding of an Alexa Fluor® conjugate or “tracer" such as Kinase Tracer 1710 to a kinase is detected by addition of a Eu-labeled anti-tag antibody. Binding of the tracer & antibody to a kinase results in a high degree of FRET, whereas displacement of the tracer with a kinase inhibitor results in a loss of FRET. Unlike many kinase activity assays, this assay is a simple mix and read assay, with no development steps. Learn More and See Which Kinases Have Been Validated Using This Assay

Z'-LYTE™ Kinase Assay Kit - Ser/Thr 21 Peptide

A coumarin and fluorescein-labeled peptide substrate which can be used for kinase screening in an antibody-free format. This substrate is based upon CDC25C, containing Ser-216.

Pierce™ Firefly Luciferase Flash Assay Kit (Thermo Scientific™)

The Thermo Scientific Pierce Firefly Luciferase Flash Assay Kit provides reagents to measure Red firefly luciferase activity in whole cell producing a very strong flash signal which decays rapidly.

Features of the Firefly Luciferase Flash Assay Kit:

• Highly sensitive detection of firefly luciferase activity
• Use with Pierce Firefly Luciferase Signal Enhancer for best results (maximum signal)
• Working solution stable for up to 2 months at -20°C
• Assay reagents compatible with other firefly luciferases
• Amenable to automation
• Contains a universal cell lysis buffer and optimized flash assay reagent
• Safe non-radioactive assay

Thermo Scientific Pierce Firefly Luciferase Flash Assay Kit contains reagents to measure the activity of firefly luciferase in mammalian whole cell lysates. Containing a convenient lysis buffer, assay buffer and firefly substrate, this kit provides a complete reagent system for the intracellular detection of promoter or pathway activity. Light output resulting from the luciferase reaction is captured using a luminometer and can be correlated with the amount of firefly luciferase protein produced and used to determine the activity of the promoter driving firefly expression. These reagents are optimized to work with Thermo Scientific Firefly Luc Plasmids; however, the Flash Assay Kit may be used to detect the activity of other firefly or ATP-dependent luciferases utilizing D-luciferin as a substrate.

Includes:
Cell lysis buffer, reaction buffer and substrate; purchase Luciferase Signal Enhancer separately.

Requires:
• Firefly luciferase and luminometer or other instrument capable of monitoring luminescence, such as Thermo Scientific Luminoskan Ascent and Varioskan Flash Microplate Readers.
• For best results (maximum signal), use with Pierce Firefly Luciferase Signal Enhancer

Applications:
• Promoter studies for analyzing cis- regulatory elements and trans-acting factors
• Drug screening
• siRNA and miRNA screening
• Multiplexed assays to study off-target effects
• Secretory pathway/protein localization reporter assays
• Signal transduction pathway analysis
• RNA splicing studies

Firefly luciferase is a 60kDa protein produced in nature by several species of the Lampyridae family of beetles which includes the genera Photinus and Luciola. Bioluminescent signal from firefly luciferase originates from the oxidation of D-luciferin. Light output captured using a luminometer can be correlated with the amount of firefly luciferase protein produced and used to determine the activity of the promoter driving firefly expression.

More Product Data
Monitoring neuronal differentiation using multiplexed luciferase reporters
Activation of the antioxidant response pathway by pesticide chemicals
Versatile luciferases: microplate luminometers and flash luciferase assays

Z'-LYTE™ Kinase Assay Kit - Ser/Thr 5 Peptide

A coumarin and fluorescein-labeled serine⁄threonine peptide substrate which can be used for kinase screening in an antibody-free format.

EnzChek™ Paraoxonase Assay Kit (Invitrogen™)

The EnzChek® Paraoxonase Assay Kit is a highly sensitive, homogenous fluorometric assay for the organophosphatase acitivty of paraoxonase. Based on the hydrolysis of a fluorogenic analog, this assay is >10-fold more sensitive than the colorimetric assay, and unlike the colorimetric assay, can distinguish samples of very similar paraoxonase activity. Under standard conditions, the assay requires only 5 µl of serum, yields a signal in as little as 15 minutes, and is linear for up to 50 minutes. The assay requires only a single reaction that can be either continuously monitored or terminated using the stop reagent included in the kit.

Z'-LYTE™ Kinase Assay Kit - Ser/Thr 16 Peptide

A coumarin and fluorescein-labeled peptide substrate which can be used for kinase screening in an antibody-free format. This peptide is based upon CDC25C, containing Ser-198.