VeraSeq™ 2.0 High-Fidelity DNA Polymerase

• 50x greater fidelity than Taq DNA Polymerase
• Extends 1 kb in 15 seconds
• Strong proofreading activity (3'→5' exonuclease activity)
• Functions in Mg²+ concentrations 1.5 to 3.0 mM
• QIAGEN Strategic Partnership & OEM offers customized bulk manufacturing of this enzyme, including low glycerol and hot 
  start formulations

VeraSeq™ 2.0 High-Fidelity DNA Polymerase is an engineered, ultra-thermostable polymerase that delivers industry-leading 
speed, fidelity and robustness to PCR amplification. The novel enzyme can extend a kilobase of sequence in 15 seconds and with 
an accuracy 50 times higher than Taq DNA Polymerase.

Supplied in: 
20 mM Tris·HCl, 100 mM KCl, 1 mM DTT, 0.1 mM EDTA, Stabilizer and 50% glycerol; pH 7.4 at 25°C.

Supplied with: 
5x VeraSeq™ Buffer II (B7102L) and 5x VeraSeq™ GC Buffer (B7130L).

You can also ask us about low glycerol or hot-start formulations. 

Polymerase properties
Extension rate: 15 seconds per kb at 72˚C
Proofreading (3'→5' exo): Yes, strong
Nick-translation (5'→3' exo): No
Fidelity: >50x higher than Taq DNA Polymerase
Strand displacement: No
Thermostability: Highly thermostable
Able to extend an RNA primer: No
Extends from a nick: No
Generate blunt-end products: Yes
Uracil read through: No

• Storage temperature: –25°C to –15°C

Source of recombinant enzyme protein
The protein is produced by a recombinant E. coli strain carrying the engineered VeraSeq 2.0 gene.

Unit definition:
One unit is defined as the amount of enzyme required to incorporate 10 nmoles of dNTPs into acid-insoluble form at 74°C in 30 minutes.

Source of recombinant enzyme protein 
The protein is produced by a recombinant E. coli strain carrying the engineered VeraSeq™ 2.0 gene.

Unit definition 
One unit is defined as the amount of enzyme required to incorporate 10 nmoles of dNTPs into acid-insoluble form at 74°C in 30 
minutes.

Protocol
General precautions should be taken when setting up a PCR, including setting up the reaction on ice, adding polymerase last, gentle pipetting, thorough mixing and a quick centrifugation. The following procedure can be used as a guideline. Reactions may need to be optimized individually.

Reaction setup (for 50 µl)

Total reaction volume can be adjusted as needed.

Typical cycling conditions

Usage Notes:

1. 5X VeraSeq™ buffer II should be used as the default buffer for high-fidelity amplification. For GC-rich and difficult templates, use 5X VeraSeq™ GC buffer.
2. VeraSeq™ 2.0 High-Fidelity DNA Polymerase stalls on uracil residues in the template strand and prevents further extension. 
   Therefore, dUTP should not be used in the reaction. If DNA templates contain uracil or dUTP needs to be incorporated, use VeraSeq™ ULtra (P7520L). 
3. A final concentration of 0.2 µM is recommended for each primer, but it can be varied in the range of 0.2 – 1 µM.
4. Recommended template quantities:

   Complexity	Source example	Guideline
   Low	Plasmid, virus, BAC	1 pg – 10 ng
   High	Genomic DNA	50–250 ng
5. One unit is usually sufficient for amplifying most targets. For long targets (>1 kb), difficult templates or to increase yield, it may 
   be necessary to add up to 2 units of enzyme.
6. Both 5X VeraSeq™ buffer II and GC buffer are formulated to provide a final 1X concentration of MgCl2 of 1.5 mM. In cases 
   where additional Mg2+ is required, adjust the final Mg2+ concentration in 0.2 mM steps. 
7. For GC-rich templates, DMSO may be used to reduce the secondary structure of complex templates. DMSO is generally used at 
   a 3 % final concentration (v/v). If additional optimization is required, adjust the concentration in 1–2% increments (2–9% in final 
   reaction). The primer annealing temperature should be lowered to account for the presence of the solvent. 
8. VeraSeq™ 2.0 High-Fidelity DNA Polymerase is also compatible with other PCR-enhancing additives, such as BSA and betaine.

Quality control analysis

Unit activity was measured using a twofold serial dilution method. Dilutions of enzyme were made in 1x reaction buffer and added 
to 50 µl reactions containing activated calf thymus DNA; 25 mM TAPS (tris-[hydroxymethyl]-methyl-amino-propanesulfonic acid, sodium salt), pH 9.3 at 25°C; 50 mM KCl; 2 mM MgCl2; 1 mM β-mercaptoethanol; 200 µM each dATP, dGTP, dTTP; and 100 
µM [3H]-dCTP (0.075 Ci/mmole). Reaction vessels were mixed and incubated at 74°C for 10 minutes.

Protein concentration is determined by OD₂₈₀ absorbance.

Physical purity is evaluated by SDS-PAGE of concentrated and diluted enzyme solutions followed by silver-stain detection. Purity is 
assessed by comparing the aggregate mass of contaminant bands in the concentrated sample to the mass of the band corresponding 
to the protein of interest in the diluted sample.

Double-stranded endonuclease activity is determined in a 50 µl reaction containing 0.5 µg of plasmid DNA and 10 µl of enzyme 
solution incubated for 4 hours at 37°C.

E. coli 16S rDNA contamination is evaluated using 5 µl replicate samples of enzyme solution that are denatured and screened in 
a TaqMan qPCR assay for the presence of contaminating E. coli genomic DNA using oligonucleotide primers corresponding to the 
16S rRNA locus.

This product is available for the following molecular biology applications:

• High-fidelity amplification
• Long amplification
• Cloning
• Synthetic biology