Learn More About Transcreener Method Used for This NSP13 Assay

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)

NSP13 Assay Schematic

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

Fluorescent Intensity (FI)

ADP FI Kinase Assay

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

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

ADP TR-FRET Kinase Assay

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

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. 

Transcreener Mix and Read Assay

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.

NSP13 Assay Z Prime

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

NSP13 Assay Suramin Dose Response

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.

Assay Development Services

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 koff 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.

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

Supplier Instrument FP Assays
FI Assays
TR-FRET Assays
berthold logo TriStar²S LB 942 in review validated validated
Mithras² LB 943 in review validated validated
bioteklogo 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
BMGLABTECH Logo 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
hidex logo Sense in review validated in review
MDS AT logo 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
perkinElmerLogo EnVision®/EnVision® Xcite validated validated validated
tecanLogo Infinite® M1000/M1000Pro/Safire2™ validated validated validated
Infinite® M200 not capable validated not capable
Infinite® F500 validated validated validated
Infinite® F200/Ultraevolution contact us validated contact us
Spark™ 10M validated validated validated

What's Included

What You Will Need

Assay Plates for TR-FRET

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.

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