LightShift™ EMSA Optimization and Control Kit
LightShift™ EMSA Optimization and Control Kit
LightShift™ EMSA Optimization and Control Kit
LightShift™ EMSA Optimization and Control Kit
Thermo Scientific™

LightShift™ EMSA Optimization and Control Kit

El kit de control y optimización EMSA Thermo Scientific LightShift es un sistema extraordinariamente robusto y sensible para realizar ensayosMás información
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Número de catálogoCantidad
20148X100 reacciones
Número de catálogo 20148X
Precio (MXN)
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Cantidad:
100 reacciones
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El kit de control y optimización EMSA Thermo Scientific LightShift es un sistema extraordinariamente robusto y sensible para realizar ensayos de cambio de movilidad electroforética (EMSA) para identificar y caracterizar las interacciones de unión proteína-ADN. El kit incluye reactivos para configurar y personalizar las reacciones de unión del ADN y un conjunto de control de ADN y extracto de proteínas para probar el sistema del kit.

Características del kit de optimización y control EMSA LightShift:

• Excelente para detectar proteínas de baja abundancia en extractos nucleares
• Sensibilidad que supera los métodos radioactivos y de digoxigenina
• Compatible con condiciones de unión establecidas previamente para interacciones ADN-proteína populares
• Incluye el sistema de control de antígenos nucleares de Epstein-Barr (EBNA) para ayudar a los nuevos usuarios a desarrollar un ensayo de trabajo y a comprender los métodos que se utilizan para confirmar la especificidad de la interacción de unión

El principio de la detección de EMSA LightShift es similar a la inmunotransferencia (western blot). El ADN bicatenario etiquetado con extremos de biotina se incuba con un extracto nuclear o factor purificado y se realiza una electroforesis del mismo en gel natural. A continuación, el ADN se transfiere rápidamente (en 30 minutos) a una membrana de nailon positiva, se entrecruza con UV, se le aplica una sonda de conjugado de estreptavidina-HRP y se incuba con el sustrato. El protocolo, desde el etiquetado hasta los resultados, puede realizarse en un solo día.

La interacción de las proteínas con el ADN es fundamental para el control de muchos procesos celulares, incluida la replicación del ADN, su recombinación y reparación, la transcripción y ensamblaje viral. Una técnica que es fundamental para estudiar la regulación de los genes y determinar las interacciones proteína-ADN es el ensayo de cambio de movilidad electroforética (EMSA).

La técnica EMSA se basa en la observación de que los complejos proteína-ADN migran más despacio que las moléculas de ADN libre cuando se los somete a una electroforesis en gel de agarosa o poliacrilamida no desnaturalizante. Dado que la tasa de migración del ADN cambia o se retarda tras la unión de proteínas, el ensayo también se denomina de retraso con gel o cambio con gel. Hasta la concepción de EMSA, las interacciones proteína-ADN se estudiaban principalmente mediante ensayos de unión de filtros de nitrocelulosa.

Para realizar el ensayo es necesario un objetivo de ADN purificado con extremo etiquetado con biotina, la prueba del extracto de proteínas, una membrana de nailon y equipos básicos de electroforesis. Los objetivos de ADN se pueden sintetizar con etiquetas 5' o 3' biotina o etiquetarse tras la síntesis con el kit de etiquetado de ADN con extremo de 3' biotina Thermo Scientific (n.° de producto 89818). Los extractos de proteínas nucleares, citosólicas o de células enteras se pueden obtener mediante una amplia variedad de métodos, incluido el kit de reactivos para la extracción citoplasmática y nuclear Thermo Scientific NE-PER (producto n.° 78833).

Más datos del producto
Geles EMSA de transferencia con el sistema Pierce G2 para efectuar transferencias rápidamente

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Para uso exclusivo en investigación. No apto para uso en procedimientos diagnósticos.
Especificaciones
ensayoEnsayo EMSA
Para utilizar con (equipo)Unidad de adquisición de imágenes myECL™, película de rayos X
IncluyeTampón de unión 10X (1 ml), ADN de control Biotina-EBNA (50 µl), ADN EBNA sin etiquetar (50 µl), extracto de EBNA (125 µl), Poly dI·dC (125 µl), glicerol al 50 % (500 µl), NP-40 al 1 % (500 µl), KCI 1 M (1 ml), MgClde 100 mM (500 µl), EDTA pH 8,0 de 200 mM (500 µl), tampón de carga 5X (1 ml)
Línea de productosLightShift
Tipo de productoKit de control y optimización EMSA LightShift
Cantidad100 reacciones
Especificidad de dianaSin especificidad
TécnicaCambio de gel
FormatoKit
Unit SizeEach
Contenido y almacenamiento
Suficiente para: 100 reacciones de unión
• 1 ml de tampón de unión 10X
• 50 µl de ADN de control Biotina-EBNA
• 50 µl de ADN EBNA sin etiquetar
• 125 µl de extracto de EBNA
• 125 µl Poly (dI·dC)
• 500 µl de glicerol al 50 %
• 500 µl de NP-40 al 1 %
•1 ml de KCI 1 M
• 100 mm de MgCI2, 500 µl
• EDTA pH 8,0 de 200 mm, 500 µl
• 5 tampones de carga, 1 ml

Almacenar a - 20 °C.

Preguntas frecuentes

If the LightShift Chemiluminescent EMSA kit has been improperly stored (i.e., at room temperature, -20°C or +4°C), will it still work correctly?

The LightShift Chemiluminescent EMSA Kit is composed of two sets of components that require different storage temperatures. One component set consists of the chemiluminescent substrates and various buffers that are stored at 4°C. The other component set consists of the control DNAs and various optimization reagents that are stored at -20°C. The EBNA extract must be maintained at -20°C or it will lose activity (proteins will degrade). Short-term storage (overnight) of the other kit components at temperatures ranging from room temperature to -20°C will not adversely affect kit performance.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

I am using the LightShift Chemiluminescent EMSA kit. Can I probe for the proteins by performing a Western blot?

This has not been tested but may be possible. A better alternative is to perform a DNA binding protein pull-down assay using a probe. The following journal article is a good example of how the LightShift Chemiluminescent EMSA Kit and pull-down assays were used to detect a transcription factor bound to a DNA probe: Ragione, A.L., et al. (2003), J. Biol. Chem. 278(26):23360-8.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

I am using the LightShift Chemiluminescent EMSA kit. How much protein do I need for each reaction?

The amount of protein extract needed for a binding reaction depends on how much active DNA binding protein is in the sample. The LightShift Kit is sensitive and will easily detect 5 fmol of active protein bound to 5 fmol of biotinylated probe. If the protein being studied is abundant, 0.25 µg of a cell lysate may be sufficient for each binding reaction. However, if the protein of interest is rare, 10 µg or more of cell lysate may be needed. Using a large excess of protein extract may lead to high background signal and non-specific bands.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

What is a "supershift"?

A supershift assay is a method for positively identifying a protein:DNA interaction on an EMSA. An antibody (typically 1 µg) is added to the binding reaction. During electrophoresis, the antibody:protein:DNA complex migrates slowly, causing a “supershift” compared to the “shift” caused by a protein:DNA complex. Not all antibodies will cause a supershift. Some antibodies do not bind to proteins once they are bound to DNA. Some antibodies can prevent protein:DNA interactions but can still be used to confirm the identity of a protein that causes a shift in the absence of the antibody.

Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

Can the LightShift Chemiluminescent EMSA Kit be used to perform supershifts?

Yes, the LightShift Chemiluminescent EMSA Kit can be used to detect supershifts. However, not all antibodies will work for supershift assays. Some antibodies will prevent protein:DNA interactions. In addition, the order in which the components of the binding reaction are assembled may affect the results of a supershift assay. Generally, 1 µg antibody is added as the last component in the binding reaction. For examples of how the LightShift Chemiluminescent EMSA Kit was used to detect supershifts, see the following:

Adimoolam, S. and Ford, J.M. (2002). PNAS. 99(20):12985-90
Magid, R., et al. (2003). J. Biol. Chem. 278(35):32994-9
Ragione, F.D., et al. (2003). J. Biol. Chem. 278(26):23360-8
Rinaldi, A.L., et al. (2002). Cancer Research. 62(19):5451-6


Find additional tips, troubleshooting help, and resources within our Protein Assays and Analysis Support Center.

Citations & References (7)

Citations & References
Abstract
Downregulation of ATG14 by EGR1-MIR152 sensitizes ovarian cancer cells to cisplatin-induced apoptosis by inhibiting cyto-protective autophagy.
Authors:He J, Yu JJ, Xu Q, Wang L, Zheng JZ, Liu LZ, Jiang BH
Journal:
PubMed ID:25650716
'Cisplatin is commonly used in ovarian cancer treatment by inducing apoptosis in cancer cells as a result of lethal DNA damage. However, the intrinsic and acquired resistance to cisplatin in cancer cells remains a big challenge for improving overall survival. The cyto-protective functions of autophagy in cancer cells have been ... More
Tristetraprolin suppresses the EMT through the down-regulation of Twist1 and Snail1 in cancer cells.
Authors:Yoon NA, Jo HG, Lee UH, Park JH, Yoon JE, Ryu J, Kang SS, Min YJ, Ju SA, Seo EH, Huh IY, Lee BJ, Park JW, Cho WJ
Journal:Oncotarget
PubMed ID:26840564
Inhibition of epithelial-mesenchymal transition (EMT)-inducing transcription factors Twist and Snail prevents tumor metastasis but enhances metastatic growth. Here, we report an unexpected role of a tumor suppressor tristetraprolin (TTP) in inhibiting Twist and Snail without enhancing cellular proliferation. TTP bound to the AU-rich element (ARE) within the mRNA 3'UTRs of ... More
Regulation of RIP3 by the transcription factor Sp1 and the epigenetic regulator UHRF1 modulates cancer cell necroptosis.
Authors:Yang C, Li J, Yu L, Zhang Z, Xu F, Jiang L, Zhou X, He S
Journal:Cell Death Dis
PubMed ID:28981102
Receptor-interacting kinase-3 (RIP3) is a key regulator of necroptosis. It has been shown that the expression of RIP3 is silenced in most cancer cells and tissues due to genomic methylation. However, the regulatory mechanisms controlling RIP3 expression in cancer cells have not been fully elucidated. Here, we report that Sp1, ... More
Human rickettsial pathogen modulates arthropod organic anion transporting polypeptide and tryptophan pathway for its survival in ticks.
Authors:Taank V, Dutta S, Dasgupta A, Steeves TK, Fish D, Anderson JF, Sultana H, Neelakanta G
Journal:Sci Rep
PubMed ID:29038575
The black-legged tick Ixodes scapularis transmits the human anaplasmosis agent, Anaplasma phagocytophilum. In this study, we show that A. phagocytophilum specifically up-regulates I. scapularis organic anion transporting polypeptide, isoatp4056 and kynurenine amino transferase (kat), a gene involved in the production of tryptophan metabolite xanthurenic acid (XA), for its survival in ... More
Curcumin Exerted Neuroprotection against Ozone-Induced Oxidative Damage and Decreased NF-
Authors:Nery-Flores SD, Mendoza-Magaña ML, Ramírez-Herrera MA, Ramírez-Vázquez JJ, Romero-Prado MMJ, Cortez-Álvarez CR, Ramírez-Mendoza AA
Journal:Oxid Med Cell Longev
PubMed ID:30693069
Ozone is a harmful tropospheric pollutant, causing the formation of reactive oxygen and nitrogen species that lead to oxidative damage in living beings. NF-