title: Optimization of Taq DNA polymerase enzyme expression in Escherichia coli.
abstract: BACKGROUND
  In the present study, we optimized the experimental conditions using pET15b expression vector to obtain large amounts of Taq DNA polymerase.
  
  
  METHODS
  Correct framing of the gene in the expression vector pET15b and its orientation were analyzed by digestion and sequencing. Production of Taq DNA polymerase in Escherichia coli BL21 (DE3) cells was induced by incubation with different concentrations of IPTG. Optimum production occurred with the addition of 1mM IPTG for 2h. The activity of the obtained enzyme was measured by comparing the intensities of the produced DNA bands in PCR reactions.
  
  
  RESULTS
  Recombinant plasmid containing taq polymerase gene was confirmed by restriction digestion and DNA sequencing. Purified protein was identified by Western blotting. Optimum condition for the production of the enzyme was induction with 1mM IPTG for 23h. Addition of NP40 increased enzyme stability.
  
  
  CONCLUSIONS
  We expressed the recombinant Taq DNA polymerase in E. coli using a T7based promoter system and obtained an active and stable enzyme.
authors: Department of Pharmaceutical Biotechnology, Isfahan Pharmaceutical Science Research Center, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Science, Isfahan, Iran.
authors: Fateme
authors: F
authors: Moazen
authors: Ali
authors: A
authors: Rastegari
authors: Sayed Mehdi
authors: SM
authors: Hoseini
authors: Mojtaba
authors: M
authors: Panjehpour
authors: Mehran
authors: M
authors: Miroliaei
authors: Hamid Mir Mohammad
authors: HM
authors: Sadeghi
keywords: Cloning; Taq DNA polymerase; expression; optimization; pET15b