Learn More About Transcreener Method Used for This NSP13 Assay

NSP13 Assay Method

Ordering Information

Assay Services

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NSP13 Assay - A Transcreener ADP² Assay Application

Transcreener ADP² Assay directly measures the ADP produced by NSP13 (Nonstructural protein 13 or SARS-CoV-2 NSP13 Helicase). These ADP measurements allows researchers to effectively determine the activity of the enzyme. The assay provides a powerful tool to screen compound libraries for NSP13 modulators to help find new therapies for disease.

The kit comes complete with the detection reagents required to measure activity. NSP13 enzyme is not included in the inhibitor screening assay kit. Please contact us for questions related to acquiring the enzyme.

How Does This NSP13 Assay Work?

The Transcreener NSP13 Assay determines NSP13 enzyme activity by directly measuring the ADP formed by the enzyme using the Transcreener ADP Assay. By detecting ADP output, the assay provides a universal method to assess the activity of any ADP-producing enzyme in real-time.

Transcreener NSP13 Assay technology uses a simple but highly effective method that consists of an antibody selective to ADP over ATP and a far-red fluorescent tracer. ADP produced in the reaction competes with the tracer changing the fluorescent properties and providing fluorescent readout.

The NSP13 assay is available with FP, FI, and TR-FRET. It is a simple mix-and-read format. Perform your enzyme reaction, add the detection reagent, and measure. The simplicity of the system yields robust results that also makes it extremely amiable to HTS.

Direct Detection of ADP to Measure NSP13 Enzymatic Activity

Fluorescent Polarization (FP)

The workhorse. Used in many large screens. Best deck and signal stability.

Learn More About The FP Assay

Transcreener ADP FP Assay Tech Manual

Fluorescent Intensity (FI)

Positive FI signal. Compatible with simple fluorescence plate readers. Faster read time than FP or TR-FRET.

Learn More About The FI Assay

Transcreener ADP FI Assay Tech Manual

Time-Resolved Förster Resonance Energy Transfer (TR-FRET)

For customers who prefer TR-FRET detection. Uses the same filter set as HTRF^®.

Learn More About The TR-FRET Assay

Transcreener ADP TR-FRET Assay Tech Manual

Applications

Measure Enzymatic Activity of NSP13
Screen Compound Libraries for NSP13 Modulators
Quantify Inhibitor Potency
Inhibitor Selectivity Profiling
Measure Drug-Target Residence Time

Features

Direct detection of unlabeled ADP
Easy to use, homogenous, one-step format
Robust Assay Z’ > 0.7 under initial velocity conditions
Far-red fluorescent readouts minimize compound interference
A safe, non-radioactive method
Available in FP, FI, or TR-FRET readouts

Easy-to-Use, Mix-and-Read, HTS-Ready Assay

Run your enzyme reaction, add Transcreener reagents, and read your plates. The NSP13 assay is compatible with 96, 384, and 1536-well formats.

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Robust Assay Yields Quality Data

Z’ measurements using optimized NSP13 reaction conditions indicate a robust assay. Robust data like this is vital for sizeable high throughput screens that are difficult to complete due to massive sample quantity. Z' shown here = 0.75.

Detection of ADP Under NSP13 Initial Velocity - FP Readout

The assay demonstrates linearity when raw data is converted to ADP using a standard curve. Here we use 500 µM ATP with 20 µM dsRNA substrate. Linearity is shown here under initial velocity conditions when raw data is converted to ADP formed. The buffer includes 20 mM Tris pH 7.5, 1 mM MgCl₂, 2.5 mM NaCl, 0.005% Brij, 0.005% BSA, 225 μg/mL ADP² antibody, and 2 nM ADP Alexa 633 tracer. The NSP13 enzyme reaction took place for 60 minutes at 37ºC in kinetic mode.

NSP13 Enzyme Titration

Linear Response

Screen for Inhibitors & Perform SAR

Transcreener Assays are designed for screening compound libraries in a high throughput format. Follow-up SAR can also be performed using the assay to determine inhibitor potency with ease. Assay conditions include 125 pM NSP13, 500 µM ATP, and 20 µM dsRNA for 60 minutes at 37ºC in kinetic mode.

Dose-Response - Suramin

IC₅₀ = 0.91 µM

NSP13 Assay Services

Interested in moving your program forward, but don't want to bring an assay in-house? Our scientists can help! BellBrook scientists will use their extensive biochemistry and enzymology expertise to work with you and accelerate your NSP13 program.

Lead Discovery Services Include:

Inhibitor Screening – To identify or confirm activity with the target.
Inhibitor Potency Profiling – Dose-response with target and/or related proteins. Fast IC₅₀ results.
Residence Time Measurements – Determination of k_off using ‘jump dilution’ enzymatic assay method.
Mechanism of Action Studies – Kinetic analysis to define the mode of inhibition.

Contact Us to Learn More

Please fill out the form below. We will respond quickly to get the conversation moving and learn how we can help. We keep things discrete, confidential, and professional.

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Far-Red FP, FI & TR-FRET Readouts Validated on Major Multimode Readers

Instrument	FP Assays	FI Assays	TR-FRET Assays
TriStar²S LB 942	in review	validated	validated
Mithras² LB 943	in review	validated	validated

Cytation™ 5	validated	validated	validated
Cytation™ 3	validated	validated	validated
Cytation™ 1	validated	validated	validated
Synergy™ H1	validated	validated	validated
Synergy™ 2/H4/4	validated	validated	validated
Synergy™ HTX	not capable	validated	not capable
Synergy™ Neo 2	validated	validated	validated

POLARstar^® Omega	validated	validated	validated
FLUOstar^® Omega	not capable	validated	validated
PHERAstar^® FSX	validated	validated	validated
PHERAstar^® Plus/FS	validated	validated	validated
CLARIOstar^® /Plus	validated	validated	validated
VANTAstar^™	validated	validated	validated

Sense	in review	validated	in review

Analyst^® GT/HT	validated	validated	validated
Gemini^® XPS/EM	not capable	validated	not capable
SpectraMax^® M2/M2e	not capable	validated	not capable
SpectraMax^® M5/M5e/FlexStation^® 3	not capable	validated	validated
SpectraMax^® Paradigm	validated	contact us	contact us
SpectraMax^® iD3/iD5	in review	validated	validated

EnVision^®/EnVision^® Xcite	validated	validated	validated

Infinite^® M1000/M1000Pro/Safire2™	validated	validated	validated
Infinite^® M200	not capable	validated	not capable
Infinite^® F500	validated	validated	validated
Infinite^® F200/Ultra^evolution	contact us	validated	contact us
Spark™ 10M	validated	validated	validated

What's Included


Component	Notes
ADP² Antibody	Antibody specific to the nucleotide ADP. Suggested ADP² antibody concentration (in the Detection Mixture) for FP is 225 μg/mL for 500 μM ATP. Yours may vary depending on, enzyme, and buffer composition.
ADP Tracer	When displaced, changes in fluorescence can be read in an FP, FI, or TR-FRET depending on the assay format.
ATP and ADP	ATP and ADP are used to create the ATP/ADP standard curve. ATP is used as a phosphate donor to start the reaction. We suggest using a starting ATP concentration of 500 μM for NSP13.

What You Will Need


Component	Notes
NSP13 Enzyme	We have successfully used recombinant human NSP13 from Cayman Chemical Cat.# 30589. An NSP13 concentration of 125 pM was used for screening and SAR.
Enzyme Buffer	20 mM Tris (pH 7.5), 1 mM MgCl_2,, 2.5 mM NaCl, 0.005% Brij-35, and 0.005% BSA. Enzyme buffer components may be optimized as required.
dsRNA Substrate	Here we used 28 bp 5'-3' dsRNA at 20 μM.
Assay Plates	Assay Plates Can Be Purchased Directly Through BellBrook Labs FP - An entirely black plate with a non-binding surface is required. We suggest Corning 384-well plates Cat. #4514 FI - An entirely black plate with a non-binding surface is required. We suggest Corning 384-well plates Cat. #4514 TR-FRET - An entirely white plate with a non-binding surface is required. We suggest Corning 384-well plates Cat. #4513
Plate Reader	A multi-detection microplate reader configured to measure the output of the ADP tracer is required.
Liquid Handling Devices	Use liquid handling devices that can accurately dispense sub-microliter volumes into 384-well plates.
Ultrapure Water	Some deionized water systems are contaminated with nucleases that can degrade both nucleotide substrates and products, reducing assay performance. Careful handling and use of ultrapure water eliminates this potential problem.

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Transcreener ADP² Assay Kits - For NSP13 Activity Assays

* For custom or bulk orders (over 100,000 wells) please contact us (info@bellbrooklabs.com) for a quote.


Cat. No.	Product Description	Price	Add to Cart
3013-A	Transcreener ADP² FI Assay (200 Assay, 96 Well)	$329.00	Add to Cart
3013-1K	Transcreener ADP² FI Assay (1,000 Assay, 384 Well)	$689.00	Add to Cart
3013-10K	Transcreener ADP² FI Assay (10,000 Assay, 384 Well)	$3,989.00	Add to Cart
3013-100K	Transcreener ADP² FI Assay (10 X 10,000 Assay, 384 Well)	$19,945.00	Add to Cart
3010-1K	Transcreener ADP² FP Assay (1,000 Assay, 384 Well)	$659.00	Add to Cart
3010-10K	Transcreener ADP² FP Assay (10,000 Assay, 384 Well)	$3,789.00	Add to Cart
3010-100K	Transcreener ADP² FP Assay (10 X 10,000 Assay, 384 Well)	$18,945.00	Add to Cart
3011-1K	Transcreener ADP² TR-FRET Red Assay (1,000 Assay, 384 Well)	$719.00	Add to Cart
3011-10K	Transcreener ADP² TR-FRET Red Assay (10,000 Assay, 384 Well)	$4,109.00	Add to Cart
3011-100K	Transcreener ADP² TR-FRET Red Assay (10 X 10,000 Assay, 384 Well)	$20,545.00	Add to Cart

Assay Plates for FI & FP

Edit
Cat. No.	Product Description	Price
2233	Corning 96-Well Black Assay Plates (#3686), 3-Pack (200+ Assays)	$40.00	Add to Cart
2229	Corning 384-Well Black Assay Plates (#4514), 3-Pack (1,000+ Assays)	$45.00	Add to Cart
2230	Corning 384-Well Black Assay Plates (#4514), 30-Pack (10,000+ Assays)	$400.00	Add to Cart

Assay Plates for TR-FRET

Cat. No.	Product Description	Price
2234	Corning 96-Well White Assay Plates (#3642), 3-Pack (200+ Assays)	$50.00	Add to Cart
2231	Corning 384-Well White Assay Plates (#4513), 3-Pack (1,000+ Assays)	$60.00	Add to Cart
2232	Corning 384-Well White Assay Plates (#4513), 30-Pack (10,000+ Assays)	$499.00	Add to Cart

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The Role of NSP13 As Therapeutic Target

COVID-19 led to intense research to find new therapeutics for the disease. As a result, a variety of different targets are currently being explored to help fight the pandemic. As an antiviral target, NSP13 is critical for SARS-CoV-2 replication, thus making it an area of extreme interest.

As one of the 16 known coronavirus nonstructural proteins, NSP13 is the most similar to other forms of the virus, such as MERS-CoV and SARS-CoV, making it an exciting target not only for the current pandemic but for future outbreaks as well (White et al. 2020).

The Transcreener ADP² NSP13 Assay is an excellent tool for researchers examining the therapeutic effects of NSP13.

NSP13 Assay – Transcreener Application

Learn More About Transcreener Method Used for This NSP13 Assay

NSP13 Assay Method

Ordering Information

Assay Services

Related Resources

NSP13 Assay - A Transcreener ADP2 Assay Application

How Does This NSP13 Assay Work?

Direct Detection of ADP to Measure NSP13 Enzymatic Activity

Fluorescent Polarization (FP)

Fluorescent Intensity (FI)

Time-Resolved Förster Resonance Energy Transfer (TR-FRET)

Applications

Features

Easy-to-Use, Mix-and-Read, HTS-Ready Assay

Robust Assay Yields Quality Data

Detection of ADP Under NSP13 Initial Velocity - FP Readout

NSP13 Enzyme Titration

Linear Response

Screen for Inhibitors & Perform SAR

Dose-Response - Suramin

IC50 = 0.91 µM

NSP13 Assay Services

Lead Discovery Services Include:

Contact Us to Learn More

Far-Red FP, FI & TR-FRET Readouts Validated on Major Multimode Readers

What's Included

What You Will Need

Transcreener ADP2 Assay Kits - For NSP13 Activity Assays

Assay Plates for FI & FP

Assay Plates for TR-FRET

The Role of NSP13 As Therapeutic Target

Related Resources

NSP13 Assay - A Transcreener ADP² Assay Application

IC₅₀ = 0.91 µM

Transcreener ADP² Assay Kits - For NSP13 Activity Assays