A wide variety of enzymes are available for research applications in cellular and molecular biology. To narrow down your search, select desired filters or enter keywords in the provided text boxes. It may be helpful to note the enzyme source, reaction conditions and units of activity provided by the manufacturers before making a purchase.
First isolated from the bacterial thermophile Thermus aquaticus, the Taq polymerase has become the staple enzyme in molecular biology. Commercial producers have sinced cloned and expressed the enzyme in E. coli. Recombinant Taq is a 94-kDa enzyme with an optimal 5’-3’ polymerase activity between 75-80 °C in the presence of a magnesium cofactor. At 72 °C it can replicate a DNA strand of 1000 base pairs in less than 10 seconds. Taq lacks 3’-5’ exonuclease activity and is prone to errors at a rate around 1 per 3,700 bases. Aside from PCR, Taq is also widely used in TA cloning due to its ability to leave 3’ overhangs. Some commercial modifications to consider include: “High Fidelity” with the recombinant addition of a 3’-5’ proofreading activity, and a “Hot Start” feature to reduce non-specific amplification.