The Taq DNA Polymerase is a highly thermostable DNA polymerase from the thermophilic bacterium Thermus aquaticus. The enzyme catalyzes template-dependent polymerization of nucleotides into duplex DNA in the 5=>3 direction. Taq DNA Polymerase has no detectable 3=>5 exonuclease (proofreading) activity and possesses low 5=>3 exonuclease activity. Like other DNA polymerases without 3=>5 exonuclease activity, Taq DNA Polymerase exhibits deoxynucleotidyl transferase activity, which frequently results in the addition of extra adenines at the 3end of PCR products.
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