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  • OneTaq® DNA Polymerase


    OneTaq DNA Polymerase is an optimized blend of Taq and Deep VentR™ DNA polymerases for use with routine and difficult PCR experiments. The 3´→ 5´ exonuclease activity of Deep Vent DNA Polymerase increases the fidelity and robust amplification of Taq DNA Polymerase (1). The OneTaq Reaction Buffers and High GC Enhancer have been formulated for robust yields with minimal optimization, regardless of a template’s GC content.

    OneTaq DNA Polymerase is supplied with two 5X buffers: (Standard and GC), as well as a High GC Enhancer solution. For most routine and/or AT-rich amplicons (Lambda, etc.) or complex amplicons with up to ~65% GC content, OneTaq Standard Reaction Buffer provides robust amplification. For GC-rich amplicons, the OneTaq GC Reaction Buffer can improve both performance and yield. For particularly high GC or difficult amplicons, the OneTaq High GC Enhancer can be added at a final concentration of 10–20% to reactions containing OneTaq GC Reaction Buffer.

    Amplification of a selection of sequences with varying GC content from human and C. elegans genomic DNA using OneTaq DNA Polymerase. GC content is indicated above gel. Marker M is the 1 kb DNA Ladder (NEB #N3232 ).

    Product Source

    An E. coli strain that carries the Taq DNA Polymerase gene from Thermus aquaticus YT-1 and an E. coli strain that carries the Deep VentR DNA Polymerase gene from Pyrococcus species GB-D.

    Reagents Supplied

    The following reagents are supplied with this product:

    Store at (°C)Concentration
    OneTaq® GC Reaction Buffer-205X
    OneTaq® Standard Reaction Buffer-205X
    OneTaq High GC Enhancer5X

    Advantages and Features


    • Ideal for routine, AT- and GC-rich PCR


    • High Sensitivity PCR
    • High Throughput PCR 
    • Routine PCR
    • GC-rich PCR
    • AT-rich PCR
    • Colony PCR 
    • Long PCR (up to ~6 kb genomic)

    Properties and Usage

    Unit Definition

    One unit is defined as the amount of enzyme that will incorporate 15 nmol of dNTP into acid insoluble material in 30 minutes at 75°C.

    Reaction Conditions

    1X OneTaq® Standard Reaction Buffer

    1X OneTaq® Standard Reaction Buffer Pack:
    20 mM Tris-HCl
    22 mM NH4Cl
    22 mM KCl
    1.8 mM MgCl2
    0.06% IGEPAL® CA-630
    0.05% Tween® 20
    pH 8.9 @ 25°C

    Usage Concentration

    1.25 units/50µl reaction

    Storage Temperature


    Storage Conditions

    10 mM Tris-HCl
    100 mM KCl
    1 mM DTT
    0.1 mM EDTA
    50% Glycerol
    0.5% Tween® 20
    0.5% IGEPAL® CA-630
    pH 7.4 @ 25°C

    Heat Inactivation


    5' - 3' Exonuclease


    3' - 5' Exonuclease


    Strand Displacement


    Unit Assay Conditions

    1X ThermoPol® Reaction Buffer, 200 µM dNTPs including [3H]-dTTP and 200 µg/ml activated Calf Thymus DNA.

    Error Rate

    < 140x10-6bases

    Quality Control

    Quality Control Assays

    The following Quality Control Tests are performed on each new lot and meet the specifications designated for the product. Individual lot data can be found on the Product Summary Sheet/Datacard or Manual which can be found in the Supporting Documents section of this page.
    • PCR Amplification (Buffer Dependent, GC-rich) :
      The polymerase is tested in a polymerase chain reaction (PCR) using a GC-rich control template and specific primers, resulting in the buffer-dependent production of the expected product
    • PCR Amplification (Enhancer Dependent, GC-rich):

      The polymerase is tested in a polymerase chain reaction (PCR) using a GC-rich control template and specific primers, resulting in the enhancer-dependent production of the expected product.

    • PCR Amplification (Master Mix):
      The polymerase is tested in a polymerase chain reaction (PCR) using a control template and specific primers, resulting in the expected product.


    1. The OneTaq High GC Enhancer should not be used alone. It should be added only to reactions with the OneTaq GC Reaction Buffer and will typically improve yields when other conditions have failed.
    2. Product specifications for individual components in the OneTaq DNA Polymerase mix are available separately.


    1. Barnes, W.M. (1994). Proc. Natl. Acad. Sci. USA. 91, 2216-2220.
    2. Saiki R.K. et al. (1985). Science. 230, 1350-1354.
    3. Powell, L.M. et al. (1987). Cell. 50, 831-840.

    Supporting Documents

    Material Safety Datasheets

    The following is a list of Material Safety Data Sheets (MSDS) that apply to this product to help you use it safely. The following file naming structure is used to name these document files: [Product Name] MSDS. For international versions please contact us at info@neb.com.


    The Product Summary Sheet, or Data Card, includes details for how to use the product, as well as details of its formulation and quality controls. The following file naming structure is used to name the majority of these document files: [Catalog Number]Datasheet-Lot[Lot Number]. For those product lots not listed below, please contact NEB at info@neb.com or fill out the Technical Support Form for appropriate document.
    1. Can I use my regular Taq-based cycling conditions for OneTaq® DNA Polymerase based products?
    2. Which buffer should I use?
    3. When should I add the High GC Enhancer?
    4. Can OneTaq® DNA Polymerase be used in colony PCR?
    5. How long a product can be made by OneTaq® DNA Polymerase?
    6. Can OneTaq® DNA Polymerase be used with uracil-containing primers or bisulfite-treated DNA?
    7. What is the fidelity of OneTaq® DNA Polymerase?
    8. Where can I find help troubleshooting my PCR?
    9. How should I determine an appropriate annealing temperature for my reaction?
    10. Which buffer should I use if I want to control the level of magnesium in the reaction?
    11. How is OneTaq DNA Polymerase different from LongAmp™ Taq DNA Polymerase?
    12. How should I set up an amplification reaction using OneTaq® DNA Polymerase?
    13. What type of DNA ends result from a primer extension reaction or a PCR using OneTaq® DNA Polymerase?
    1. PCR Protocol for OneTaq® DNA Polymerase (M0480)

    Selection Tools

    Usage Guidelines & Tips

    Troubleshooting Guides

    Interactive Tools

    Application Notes


    • Malyshev, D.A., Dhami, K., Quach, H.T., Lavergne, T., Ordoukhanian, P., Torkamani, A. and Romesberg, F.E. (2012) Efficient and sequence-independent replication of DNA containing a third base pair establishes a functional six-letter genetic alphabet. Proc. Natl. Acad. Sci. USA 109, 12005-10. PubMedID: 22773812
    • Liang, Y., Basu, D., Pattathil, S., Xu, W.L., Venetos, A., Martin, S.L., Faik, A., Hahn, M.G. and Showalter, A.M. (2013) Biochemical and physiological characterization of fut4 and fut6 mutants defective in arabinogalactan-protein fucosylation in Arabidopsis. J. Exp. Bot. 64, 5537-5551. PubMedID: 24127514
    • Matousková, M., Vesely, P., Daniel, P., Mattiuzzo, G., Hector, R.D., Scobie, L., Takeuchi, Y. and Hejnar, J. (2013) Role of DNA methylation in expression and transmission of porcine endogenous retroviruses. Journal of Virology. JVI.03262-12, 12110-20. PubMedID: 23986605
    Did you know most OneTaq reactions amplify more efficiently and robustly when you use a 68°C extension temperature?