ViraPower™ Lentiviral Packaging Mix
ViraPower™ Lentiviral Packaging Mix
Invitrogen™

ViraPower™ Lentiviral Packaging Mix

ViraPower™ Lentiviral Packaging Mix contains an optimized mixture of the three packaging plasmids, pLP1, pLP2, and pLP/VSVG. These plasmids supplyRead more
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Catalog number K497500
Price (USD)
3,565.00
Each
Add to cart
Price (USD)
3,565.00
Each
Add to cart
ViraPower™ Lentiviral Packaging Mix contains an optimized mixture of the three packaging plasmids, pLP1, pLP2, and pLP/VSVG. These plasmids supply the helper functions as well as structural and replication proteins in trans required to produce a recombinant lentivirus, containing your gene of interest, using our ViraPower™ Lentiviral Expression System.

The ViraPower™ Lentiviral Expression System
The ViraPower™ Lentiviral Expression System allows creation of a replication-incompetent, HIV-1–based lentivirus that is used to deliver and express your gene of interest in either dividing or non-dividing mammalian cells. The major components of the system include:

• An expression plasmid containing the gene of interest under the control of a choice of promoters, and elements that allow packaging of the construct into virions
• An optimized mix of the three packaging plasmids (pLP1, pLP2, and pLP/VSVG) that supply the structural and replication proteins in trans that are required to produce the lentivirus
• The 293FT cell line, which allows production of lentivirus following cotransfection of the expression plasmid and the plasmids in the packaging mix
• Control expression plasmid to optimize virus production and cell transduction, containing either the lacZ gene—which when packaged into virions and transduced into a mammalian cell line, expresses β-galactosidase (included with each expression vector), or the Emerald Green Fluorescent Protein (EmGFP) gene—which when packaged into virions and transduced into a mammalian cell line, expresses EmGFP.
For Research Use Only. Not for use in diagnostic procedures.
Specifications
Constitutive or Inducible SystemConstitutive
Delivery TypeLentiviral
PromoterRSV, CMV
Product TypeLentiviral Packaging Mix
Selection Agent (Eukaryotic)Blasticidin
Protein TagV5 Epitope Tag
Cloning MethodTOPO-TA, Gateway
Quantity60 reactions
VectorpLP
Product LineViraPower™
For Use With (Application)Viral Expression
Unit SizeEach
Contents & Storage
Three tubes, each containing 195 μg lyophilized mix. The packaging mix is enough for 60 transfection reactions in 10 cm tissue culture dishes. Store at -20°C.

Frequently asked questions (FAQs)

I used one of your lentiviral vectors but am observing cytotoxic effects after transduction. Can you please help?

Possible causes include:

- large volume of viral supernatant used for transduction
- cells sensitive to Polybrene regaent
- too much antibiotic used for selection
- antibiotic used too soon after tranduction
- gene of interest is toxic to cells

I transduced my lentiviral stock into my mammalian cell line but am getting poor expression of my gene of interest. What could have happened?

Poor expression could result from low transduction efficiency, too low of a MOI, too much antibiotic used for selection, usage of antibiotic too soon after transduction, harveting cells too soon after transduction, having a gene of interest that is toxic to cells, or rerrangement in the LTR regions of the expression construct plasmid DNA.

I transduced my lentiviral stock into my mammalian cell line but am getting no expression of my gene of interest. What could have gone wrong?

Here are some possible causes and solutions:
- Promoter silencing; CMV promoter is prone to silencing especially in mouse and rat cells, screen multiple antibiotic resistant clones and select the one with the highest expression levels
- Viral stocks stored incorrectly; aliquot and store at -80 degrees C, do not freeze/thaw more than 3 times

I prepared a lentiviral stock using one of your lentiviral vectors. I am trying to determine the titer using antibiotic selection but am not able to since the cells are very confluent and I am not getting antibiotic-resistant clones. Can you please offer some tips?

Here are some possible causes and solutions:

- Too little antibotic used for selection
- Selection performed on confluent cells; replate cells
- Viral supernatant not diluted sufficiently; titer lentivus using a wider range of 10-fold serial dilutions

I am using one of your lentiviral vectors and am getting a low lentiviral titer. Can you offer some troubleshooting tips?

Possible causes include:

- low transfection efficiency; Use a high-quality plasmid prep, 293FT cells under passage 16, ensure removal of Geneticin during transfection, ensure correct DNA:lipid ratio, and that cells are plated at the correct confluency
- transfected cells are not cultured in medium containing sodium pyruvate; this reagent provides an extra energy source for cells
- viral supernatant harvested too early; viral supernatants can generally be collected 48-72 hrs post-transfection
- viral supernatant too dilute; concentrate virus using CsCl purification
- viral supernatant frozen and thawed multiple times; 3 times should be the maximum freeze/thaw
- gene of interest is large; viral titers decrease as size of insert increases, inserts larger than 5.6 kb are not recommended
- rearrangement in the LTR region of the epxression construct plasmid DNA; use Stb3 cells for transformatin of the lentiviral construct
- poor choice of titering cell line; use HT1080 cells or similar cell line
- Polybrene reagent is not included during transduction; transduce lentiviral construct into cells in the presence of Polybrene reagent
- Lipofectamine reagent handled incorrectly; ensure proper storage and mix gently before use
- Use fluorescence micrscopy to check titer with HiPerform FastTiter lentivirus

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