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AccuPrime™ GC-Rich DNA Polymerase is a robust enzyme formulation designed for high-specificity, high-yield PCR amplification of difficult GC-rich templates (>65% GC content). This extremely thermostable DNA polymerase, from the archaebacterium Pyrolobus fumarius, retains full activity after incubation at 95°C for 4 hours and has five-fold better processivity than Taq DNA polymerase. The enzyme is supplied with two separate 5X AccuPrime™ GC-Rich Buffer mixtures (A and B) containing thermostable AccuPrime™ proteins, MgSO 4, and dNTPs. Thermostable AccuPrime™ proteins enhance primer-template hybridization during every cycle of PCR, greatly increasing the specificity and robustness of the reaction. Buffer A is optimized for GC-rich genomic DNA targets, while Buffer B is optimized for non-GC-rich genomic DNA, cDNA, and plasmids. Sufficient reagents are provided for 200 or 1000 amplification reactions of 25 μl each (at 1 unit of enzyme per reaction)

Kit Size

Component 200 Rxns
 1000 Rxns
AccuPrime™ GC-Rich DNA Polymerase 100 μl
500 μl
5X AccuPrime™ GC-Rich Buffer A
1 ml
5 ml
5X AccuPrime™ GC-Rich Buffer B
1 ml
5 ml
50-mM MgSO4
1 ml 1 ml

Unit Definition

One unit of enzyme is the amount of enzyme required to incorporate 10 nmoles of dNTPs into acid insoluble material in 30 minutes at 74°C.

Enzyme Storage Buffer

2 U/μl in 50-mM Tris-HCl (pH 8.0), 100-mM KCl, 1-mM Dithiothreitol (DTT), 0.1-mM EDTA, 50% Glycerol, and 0.1% Triton® X-100

5X AccuPrime™ GC-Rich Buffer

Buffer A and B differ in their concentration of MgSO 4 and enhancers.

Key components are:

300-mM Tris-HCl (pH 9.2), MgSO 4 at 10 mM (Buffer A) or 7.5 mM (Buffer B), 150-mM NaCl, 1-mM dGTP, 1-mM dATP, 1-mM dTTP, 1-mM dCTP, thermostable AccuPrime™ proteins, and enhancers

Product Qualification

The Certificate of Analysis (CofA) provides detailed quality control information for each product. The CofA is available here, and is searchable by product lot number, which is printed on each box.

Recommendations and Guidelines

Use 5–100 ng genomic DNA or plasmid DNA, or 10–100 ng cDNA or bacteriphage lambda DNA

Primers: Use ≥50 ng each primer per 25-μl reaction. A T m of 65–70°C is optimal for most applications. Primer design is one of the most important factors in successful PCR. We recommend using the OligoPerfect™ Designer, available at here.

Buffers: In general, we recommend using Buffer A for GC-rich genomic DNA targets and Buffer B for non-GC-rich genomic DNA, cDNA, and plasmids. Also use Buffer B if you find that Buffer A is inhibitory with your genomic targets.

Magnesium: MgSO 4 is included in Buffer A at a final concentration of 2 mM and Buffer B at 1.5 mM. For some targets, more Mg 2+ may be required; use the 50-mM MgSO 4 provided in the kit to prepare a titration from 2 mM to 4 mM (final concentration) in 0.25-mM increments.

Reaction: Take appropriate precautions to avoid cross-contamination of DNA between reactions. Ideally, amplification reactions should be assembled in a DNA-free environment. Use of aerosol-resistant barrier tips is recommended.


The following protocol is recommended as a starting point. Optimal reaction conditions (incubation times and temperatures; concentrations of enzyme, primers, and template) may vary. After preparation of the samples, transfer them immediately to a preheated thermal cycler and start the amplification program.

  1. Add components in the following order to each reaction vessel. Prepare a master mix for multiple reactions to enable accurate pipetting.

    DNA template (above)                                                      x μl
    Sense primer (10 μM)                                                    0.5 μl
    Anti-sense primer (10 μM)                                            0.5 μl
    5X Buffer A or B                                                              5 μl
    AccuPrime™ GC-Rich DNA Polymerase (2 U/μl)*         0.5 μl
    Sterile water to                                                               25 μl
    *Up to 2 U of enzyme (1 μl) may be added for difficult templates.

  2. Cap/seal the reaction vessels and flick with your finger for several seconds to mix.

  3. Program the thermal cycler as follows. Note that the annealing temperature will vary depending on the Tm of your primers. The optimal annealing temperature is typically 5°C below the Tm of the primers.

    Step Temp (GC-rich
    Denaturation 95°C 3 min
    Denaturation 95°C 30 sec
    55–65°C (5°C < Tm) 30 sec
    Extension 72°C 1 min/kb
    Final Extension
    10 min

  4. Maintain the reaction at 4°C after cycling. The samples can be stored at –20°C until use. Analyze 5–10 μl of sample by agarose gel electrophoresis.
MAN0001075       11-Jun-2010