Expi293™ Inducible GnTI- Expression System Kit
Expi293™ Inducible GnTI- Expression System Kit
Gibco™

Expi293™ Inducible GnTI- Expression System Kit

The Expi293 Inducible GnTI- Expression System Kit is part of the Expi293 platform for rapid, high-yield transient protein expression fromRead more
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Catalog number A39252
Price (USD)
3,930.00
Each
Add to cart
Price (USD)
3,930.00
Each
Add to cart
The Expi293 Inducible GnTI- Expression System Kit is part of the Expi293 platform for rapid, high-yield transient protein expression from mammalian 293 cells. The system kit is centered on engineered Expi293F cells that do not have N-acetylglucosaminyltransferase I (GnTI) activity, therefore lacking complex N-glycans, and stably express the tetracycline repressor (TetR) protein, thus enabling tetracycline-regulated protein expression. The Expi293F Inducible GnTI- cell line was established by the selective knockout of the GnTI gene and the stable integration of the regulatory plasmid pcDNA6/TR, which encodes the TetR gene under the control of the human CMV promoter, in parental Expi293F cells. This cell line is a powerful tool for tetracycline-inducible high-yield expression of homogeneously glycosylated recombinant proteins.

Expi293 Inducible GnTI- Expression System Kit features include:
• Homogeneous N-glycosylation of expressed proteins
• Tetracycline-inducible protein expression with extremely low basal expression levels
• Equivalent protein yields to parental Expi293F cells—up to 1 g/L
• pcDNA5/TO expression vector for tetracycline-regulated expression of the gene of interest
• Suspension, high-density culture of Expi293F Inducible GnTI- cells in Expi293 Expression Medium
• High-efficiency transient transfection using ExpiFectamine 293 reagent in combination with specialized transfection enhancers

The components included in the Expi293 Inducible GnTI- Expression System Kit are: one vial of frozen Expi293F Inducible GnTI- cells, 1 L of Expi293 Expression Medium, one ExpiFectamine 293 transfection kit sufficient to transfect 1 L of culture, 100 mL Opti-Plex Complexation Buffer, one PNGase F Glycan Cleavage kit, one pcDNA5/TO Mammalian Expression Vector kit, 500 mg tetracycline hydrochloride, and the pRABBIT IgG IRES-EmGFP positive control vector. All components of the Expi293 Inducible GnTI- Expression System are also available for individual purchase.

For Research Use Only. Not for use in diagnostic procedures.
Specifications
Delivery TypeTransfection
Quantity1 kit
Shipping ConditionApproved for shipment at Room Temperature or on Wet or Dry Ice
Cell LineExpi293F™
Product LineExpi293™
For Use With (Application)Protein Production
PromoterCMV/TO
Unit SizeEach
Contents & Storage
• Expi293F Inducible GnTI- Cells (1x107 cells/vial), store in vapor-phase liquid nitrogen
• 1 L Expi293 Expression Medium, store at 2–8°C (protect from light)
• ExpiFectamine 293 Transfection Kit for 1 L of culture, store at 2–8°C
• PNGase F Glycan Cleavage Kit, store at -20C
• 100 mL Opti-Plex Complexation Buffer, store at 2–8°C (protect from light)
• 20 μg pcDNA5/TO Mammalian Expression Vector, store at 2–8°C or long term storage at -20°C.
• 500 mg Tetracycline Hydrochloride, store at -20°C
• pRABBIT IgG IRES-EmGFP Positive Control Vector, store at 2–8°C or long term storage at -20°C

Frequently asked questions (FAQs)

Can I leave my Expi293F culture expressing for more than 7 days?

The growth and expression characteristics of Expi293F cells are such that, by 7 days post-transfection, the culture medium should be close to being spent and maximal protein expression should have already been achieved. Continued incubation will result in a large decrease in cell culture viability.

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

What is the difference between the Expi293F Inducible Cell Line and the T-REx -293 Cell Line?

The Expi293F Inducible Cell Line was created using the same technology as the T-REx -293 Cell Line. Both cell lines have been created by stable transfection with the pcDNA 6/TR vector; thus, they ubiquitously express the tetracycline repressor (TetR) protein. The parental cell line of Expi293F Inducible cells is Expi293F Cells (Cat. No. A14527). The key differences between these 2 cell lines are:
- Expi293F Inducible cells are grown in suspension and are adapted to high-density culture (> 15x10E6 cells/mL).
- Expi293F Inducible cells grow in Expi293 Expression System and perform equivalently to parental Expi293F cells, thus making them ideal for high-yield, inducible protein expression.

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

What method do you recommend for quantifying rabbit IgG expression from pRABBIT IgG IRES-EmGFP Positive Control Vector, Cat. No. A39243?

The formation of intact IgG molecules may be quantified using a sandwich ELISA designed to capture and detect rabbit IgG. Besides the rabbit IgG positive control vector, reagents, and consumables that are included in the kit, you will also need purified rabbit IgG to be used as a standard, F(ab')2-Goat anti-Rabbit IgG (H+L) Cross-Adsorbed Secondary Antibody, HRP (Cat. No. A10547), Protein A Coated Plates, Clear, 96-Well (Cat. No. 15130), TMB Substrate Kit (Cat. No. 34021), SuperBlock (TBS) Blocking Buffer (Cat. No. 37535), and PBS or TBS buffer for washes. There is an example procedure in our Protein A Coated Plates manual (https://tools.thermofisher.com/content/sfs/manuals/MAN0011310_Thermo Scientific_ProteinA_G_AG_Coat_96Well_UG.pdf). Please note that our R&D scientists determine titer values from crude cell culture supernatants using a Pall Life Sciences FortéBio Octet instrument equipped with a Protein A biosensor.

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

Do you offer a GFP-expressing mammalian expression vector that I can use as a control to monitor my transfection and expression with the Expi systems?

We offer pRABBIT IgG IRES-EmGFP Positive Control Vector, Cat. No. A39243, which you can use to monitor your transfection and expression.

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

Can I use doxycycline instead of tetracycline as an inducer in the Expi293 Inducible Expression System?

Doxycycline may be used as an alternative inducing agent in the Expi293 Inducible System. It is similar to tetracycline in its mechanism of action. Doxycycline has been shown to have a longer half-life than tetracycline (48 hr vs. 24 hr, respectively). If the use of doxycycline is desired with the Expi293 Inducible System, we recommend performing a dose-response curve to determine the optimal concentration for induction.

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