High-Specificity Pfu HS Mix
A high-fidelity DNA polymerase (higher than 130x Taq fidelity) High-Specificity Pfu HS Mix is highly suited to target enrichment, NGS library amplification, and cloning applications. High-Specificity Pfu HS Mix provides high yield and sensitivity, as well as superior amplification of GC- and AT-rich targets. The hot-start aptamer binds reversibly to the polymerase which inhibits its activity at ambient temperatures and improves the specificity of the amplification.
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High-Specificity Pfu HS Mix is a combination of the latest advances in buffer chemistry and PCR enhancers and stabilizers, together with an aptamer-mediated hot-start polymerase, dNTPs, and MgCl2. The advanced buffer chemistry has been developed for fast, highly reproducible PCR and is designed for superior sensitivity and specificity, making High-Specificity Pfu HS Mix perfect for NGS library amplification.
In nature, the ability of a DNA polymerase to correct misincorporation of nucleotides in the DNA strand being elongated is often crucial to the survival of the host organism. This ability is termed “proofreading activity” and occurs in the 3′ to 5′ direction. This activity also leads to the polymerase removing unpaired nucleotides overhanging at the 3’end (A-overhangs), creating blunt ends.
High-Specificity Pfu HS Mix fidelity was determine using the method developed by Lee et al. ( Mapping DNA polymerase errors by single-molecule sequencing. Lee F. D., et al. Nucleic Acids Research, 44 (13) e118 2016 (doi: 10.1093/nar/gkw436)) using a barcode strategy and NGS to characterize the average error rate, error hotspots and lesion bypass fidelity of the DNA polymerase.
High-Specificity Pfu HS Mix is designed to work in the presence of inhibitors. If there is too much interference the concentration of magnesium can be increased, for example, up to 4 mM (in the final reaction) should be added in presence of more than 10% of whole blood.
High-Specificity Pfu HS Mix has been validated for templates up to 5 kb.
Aptamers are engineered oligonucleotides that bind to the active site of the Taq DNA polymerase, but are denatured and released as the temperature is increased during the PCR cycling. This aptamer-mediated inhibition/activation process is however fully reversible, and so at the end of thermal cycling, when the temperature of the reaction is decreased, the aptamer refolds and rebinds to Taq DNA polymerase, inhibiting any further activity in the sample. This has proven to be important in workflows where undesired polymerase activity after reaction completion can disturb baseline readings, such as NGS following amplification of a library.
No, the ends of the aptamer are blocked to prevent them being sequences.
High-Specificity Pfu HS Mix should be stored at -20°C for optimal retention of activity. We do not recommend the storage of High-Specificity Pfu HS Mix at -80 °C as ice crystals could form on the active site, which may affect or destroy the activity of the enzyme.
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