Q5® High-Fidelity DNA Polymerase, New England BioLabs

Supplier: New England Biolabs (NEB)

M0492L M0492S M0491L M0491S M0494L M0494S M0493L M0493S E0555S E0555L M0494X
CA102500-132EA 1163 CAD
CA102500-132 CA102500-134 CA102500-136 CA102500-138 CA102500-140 CA102500-142 CA102500-144 CA102500-146 CA102855-120 CA102855-122 CA76307-458
Q5® High-Fidelity DNA Polymerase, New England BioLabs
Nucleic Acid Reagents End-point PCR Enzymes and Kits

The Q5® High-Fidelity 2X Master Mix offers robust, high-fidelity performance in a convenient master mix format.


  • For use in high-specificity PCR, high-fidelity PCR, cloning, long or difficult amplification and high-throughput PCR.


The Q5 High- Fidelity 2X Master Mix features a high-fidelity, thermostable DNA polymerase with 3´→ 5´ exonuclease activity, fused to a processivity-enhancing Sso7d domain to support robust DNA amplification. With an error rate > 100-fold lower than that of Taq DNA Polymerase and 12-fold lower than that of Pyrococcus furiosus (Pfu) DNA Polymerase, Q5 High-Fidelity DNA Polymerase is ideal for cloning and can be used for long or difficult amplicons. The convenient master mix formulation is supplied at a 2X concentration. The mix contains dNTPs, Mg++ and a proprietary broad-use buffer requiring only the addition of primers and DNA template for robust amplification regardless of GC content. When used at the recommended 1X final concentration, the Q5 High-Fidelity Master Mix contains 2 mM MgCl2. Q5 High-Fidelity DNA Polymerase is unlike typical, lower fidelity PCR enzymes.


Ordering information: The Q5 High-Fidelity DNA Polymerase and the Q5 Hot Start High-Fidelity DNA Polymerase are supplied with Q5 High GC Enhancer and Q5 Reaction Buffer.

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