Limited time offer: 3 year warranty when you purchase a SimpliAmp Thermal Cycler. View flyer »

LightShift™ EMSA Optimization and Control Kit

Catalog number: 20148X

Thermo Scientific™  Related applications: Nucleic Acid Gel Electrophoresis & Blotting

Error loading your content!

  Catalog number
Select a plan
Unit size
Price ({{currency}}) Availability Qty
{{product.sku}} {{product.sku}} also known as {{product.formattedSku}} 
Pro add-ons

Your on-site stock

›› {{supplyCenter.scName}}({{scProduct.stockOnHand}} In stock)
›› {{supplyCenter.scName}}(Out of stock)
›› {{supplyCenter.scName}}
This item is not currently available on-site. Depending on your Supply Center settings you may be able to add the item to cart above else use the Order Non-Stocked Items' tab on the Supply Center home page.
Back to top


The Thermo Scientific LightShift EMSA Optimization and Control Kit is an extraordinarily robust and sensitive system for performing electrophoretic mobility shift assays (EMSA) to identify and characterize protein-DNA binding interactions. The kit includes reagents for setting up and customizing DNA binding reactions and a control set of DNA and protein extract to test the kit system.

Features of theLightShift EMSA Optimization and Control Kit:

• Excellent for detecting low-abundance proteins in nuclear extracts
• Sensitivity that surpasses radioactive and digoxigenin methods
• Compatible with previously established binding conditions for popular DNA-protein interactions
• Includes EBNA control system to help new users develop a working assay and understand the methods used to confirm binding interaction specificity

The principle for LightShift EMSA Detection is similar to a Western blot. Biotin end-labeled duplex DNA is incubated with a nuclear extract or purified factor and electrophoresed on a native gel. The DNA is then rapidly (30 minutes) transferred to a positive nylon membrane, UV crosslinked, probed with streptavidin-HRP conjugate and incubated with the substrate. The protocol from labeling to results can be accomplished in a single day.

The interaction of proteins with DNA is central to the control of many cellular processes including DNA replication, recombination and repair, transcription, and viral assembly. One technique that is central to studying gene regulation and determining protein:DNA interactions is the electrophoretic mobility shift assay (EMSA).

The EMSA technique is based on the observation that protein:DNA complexes migrate more slowly than free DNA molecules when subjected to non-denaturing polyacrylamide or agarose gel electrophoresis. Because the rate of DNA migration is shifted or retarded upon protein binding, the assay is also referred to as a gel shift or gel retardation assay. Until conception of the EMSA protein:DNA interactions were studied primarily by nitrocellulose filter-binding assays.

All that is needed to perform the assay is purified DNA target that has been end-labeled with biotin, the protein extract to be tested, nylon membrane and basic electrophoresis equipment. DNA targets can be synthesized with 5' or 3' biotin labels or they can be labeled after synthesis using the Thermo Scientific Biotin 3' End DNA Labeling Kit (Product No. 89818). Nuclear, cytosolic or whole cell protein extracts can be obtained by a variety of methods, including the Thermo Scientific NE-PER Nuclear and Cytoplasmic Extraction Reagent Kit (Product No. 78833).

More Product Data
Transfer EMSA gels using the Pierce G2 Fast Blotter

Related Products
LightShift™ Chemiluminescent EMSA Kit
LightShift™ Poly (dI-dC)
For Research Use Only. Not for use in diagnostic procedures.


Assay Type: EMSA Assay
For Use With (Equipment): X-Ray Film, myECL™ Imager
Product Line: LightShift™
Product Size: 100 reactions
Technique: Gel Shift

Contents & storage

Sufficient For: 100 binding reactions
• 10X Binding Buffer, 1 mL
• Biotin-EBNA Control DNA, 50 µL
• Unlabeled EBNA DNA, 50 µL
• EBNA Extract, 125 µL
• Poly (dI·dC), 125 µL
• 50% Glycerol, 500 µL
• 1% NP-40, 500 µL
• 1 M KCl, 1 mL
• 100mM MgCl2, 500 µL
• 200mM EDTA pH 8.0, 500 µL
• 5X Loading Buffer, 1 mL

Store at -20°C.


Manuals & protocols