Regulatory status: For research use only, not for use in diagnostic procedures.

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cultured cells
Species Reactivity
Human, Mouse
Intended Use
The G3BP-1 Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can monitor G3BP-1 protein expression profile in cells. The kit can be used for measuring the relative amounts of G3BP-1 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on G3BP-1.
Contents of Kit
1. 96-Well Cell Culture Clear-Bottom Microplate: 1 plate
2. 10x TBS: 24 mL (10x), Clear
3. Quenching Buffer: 24 mL (1x), Clear
4. Blocking Buffer: 50 mL (1x), Clear
5. 10x Wash Buffer: 50 mL (10x), Clear
6. 100x Anti-G3BP-1 Antibody (Rabbit Polyclonal): 60 μL (100x), Purple
7. 100x Anti-GAPDH Antibody (Mouse Monoclonal): 60 μL (100x), Green
8. HRP-Conjugated Anti-Rabbit IgG Antibody: 6 mL (1x), Glass
9. HRP-Conjugated Anti-Mouse IgG Antibody: 6 mL (1x), Glass
10. Primary Antibody Diluent: 12 mL (1x), Clear
11. Ready-to-Use Substrate: 12 mL (1x), Brown
12. Stop Solution: 12 mL (1x), Clear
13. Crystal Violet Solution: 6 mL (1x), Glass
14. SDS Solution: 24 mL (1x), Clear
15. Adhesive Plate Seals: 4 seals
4°C/6 Months


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MYCNOS functions as an antisense RNA regulating MYCN


Authors: Vadie, Nadia; Saayman, Sheena; Lenox, Alexandra; Ackley, Amanda; Clemson, Mathew; Burdach, Jon; Hart, Jonathan; Vogt, Peter K.; Morris, Kevin V.

Amplification or overexpression of neuronal MYC (MYCN) is associated with poor prognosis of human neuroblastoma. Three isoforms of the MYCN protein have been described as well as a protein encoded by an antisense transcript (MYCNOS) that originates from the opposite strand at the MYCN locus. Recent findings suggest that some antisense long non-coding RNAs (lncRNAs) can play a role in epigenetically regulating gene expression. Here we report that MYCNOS transcripts function as a modulator of the MYCN locus, affecting MYCN promoter usage and recruiting various proteins, including the Ras GTPase-activating protein-binding protein G3BP1, to the upstream MYCN promoter. Overexpression of MYCNOS results in a reduction of upstream MYCN promoter usage and increased MYCN expression, suggesting that the protein-coding MYCNOS also functions as a regulator of MYCN ultimately controlling MYCN transcriptional variants. The observations presented here demonstrate that protein-coding transcripts can regulate gene transcription and can tether regulatory proteins to target loci.

Foot-and-Mouth Disease Virus Leader Protease Cleaves G3BP1 and G3BP2 and Inhibits Stress Granule Formation


Authors: Visser, Linda J.; Medina, Gisselle N.; Rabouw, Huib H.; de Groot, Raoul J.; Langereis, Martijn A.; de los Santos, Teresa; van Kuppeveld, Frank J. M.

Like other viruses, the picornavirus foot-and-mouth disease virus (FMDV; genus Aphthovirus), one of the most notorious pathogens in the global livestock industry, needs to navigate antiviral host responses to establish an infection. There is substantial insight into how FMDV suppresses the type I interferon (IFN) response, but it is largely unknown whether and how FMDV modulates the integrated stress response. Here, we show that the stress response is suppressed during FMDV infection. Using a chimeric recombinant encephalomyocarditis virus (EMCV), in which we functionally replaced the endogenous stress response antagonist by FMDV leader protease (L-pro) or 3C(pro), we demonstrate an essential role for L-pro in suppressing stress granule (SG) formation. Consistently, infection with a recombinant FMDV lacking L-pro resulted in SG formation. Additionally, we show that L-pro cleaves the known SG scaffold proteins G3BP1 and G3BP2 but not TIA-1. We demonstrate that the closely related equine rhinitis A virus (ERAV) L-pro also cleaves G3BP1 and G3BP2 and also suppresses SG formation, indicating that these abilities are conserved among aphthoviruses. Neither FMDV nor ERAV L-pro interfered with phosphorylation of RNA-dependent protein kinase (PKR) or eIF2 alpha, indicating that L-pro does not affect SG formation by inhibiting the PKR-triggered signaling cascade. Taken together, our data suggest that aphthoviruses actively target scaffolding proteins G3BP1 and G3BP2 and antagonize SG formation to modulate the integrated stress response. IMPORTANCE The picornavirus foot-and-mouth disease virus (FMDV) is a notorious animal pathogen that puts a major economic burden on the global livestock industry. Outbreaks have significant consequences for animal health and product safety. Like many other viruses, FMDV must manipulate antiviral host responses to establish infection. Upon infection, viral double-stranded RNA (dsRNA) is detected, which results in the activation of the RNA-dependent protein kinase (PKR)-mediated stress response, leading to a stop in cellular and viral translation and the formation of stress granules (SG), which are thought to have antiviral properties. Here, we show that FMDV can suppress SG formation via its leader protease (L-pro). Simultaneously, we observed that L-pro can cleave the SG scaffolding proteins G3BP1 and G3BP2. Understanding the molecular mechanisms of the antiviral host response evasion strategies of FMDV may help to develop countermeasures to control FMDV infections in the future.

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