taq-polymerase
What is Taq Polymerase?
Taq polymerase is a thermostable DNA polymerase enzyme originally isolated from the bacterium Thermus aquaticus, which lives in hot springs and hydrothermal vents. Its main function is to synthesize DNA by adding nucleotides to a DNA strand during replication.
Key Features
-
Thermostability:
Can withstand high temperatures (up to 95 °C), which is essential for PCR (Polymerase Chain Reaction).Unlike most enzymes, it does not denature during the DNA denaturation step. -
Function in PCR:
Catalyzes the elongation of DNA strands using primers.
Works best at ~72 °C, the optimal extension temperature for PCR.
-
Limitations:
Lacks 3’→5’ exonuclease proofreading activity, so it has a higher error rate compared to proofreading polymerases.
Not ideal for cloning where high-fidelity DNA replication is needed.
Applications
PCR amplification of DNA sequences.
DNA cloning (with caution due to lower fidelity).
Molecular diagnostics and forensic DNA analysis.
Research in genetics, microbiology, and biotechnology.