Improved activity and pH stability of E-coli ATCC 11105 penicillin acylase by error-prone PCR

Balci, H., Ozturk, M. T., Pijning, T., Ozturk, S. I. & Gumusel, F., May-2014, In : Applied Microbiology and Biotechnology. 98, 10, p. 4467-4477 11 p.

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  • Improved activity and pH stability of E-coli ATCC 11105 penicillin acylase

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  • Huseyin Balci
  • Merve Tuzlakoglu Ozturk
  • Tjaard Pijning
  • Saliha Issever Ozturk
  • Fusun Gumusel

Penicillin G acylase is the key enzyme used in the industrial production of β-lactam antibiotics. This enzyme hydrolyzes penicillin G and related β-lactam antibiotics releasing 6-aminopenicillanic acid, which is an intermediate in the production of semisynthetic penicillins. To improve the enzymatic activity of Escherichia coli penicillin acylase, sequential rounds of error-prone polymerase chain reaction were applied to the E. coli pac gene. After the second round of evolution, the best mutant M2234 with enhanced activity was selected and analyzed. DNA sequence analyses of M2234 revealed that one amino acid residue (K297I), located far from the center of the catalytic pocket, was changed. This mutant (M2234) has a specific activity 4.0 times higher than the parent enzyme and also displayed higher stability at pH 10.

Original languageEnglish
Pages (from-to)4467-4477
Number of pages11
JournalApplied Microbiology and Biotechnology
Issue number10
Publication statusPublished - May-2014


  • Directed evolution, Error-prone PCR, E. coli penicillin acylase, 3D homology model, Catalytic activity, BETA-LACTAM ANTIBIOTICS, KINETICALLY CONTROLLED SYNTHESIS, DIRECTED EVOLUTION, CATALYTIC-ACTIVITY, ENZYME, AMIDASE, GENE, SITE, MUTAGENESIS, ATCC-11105

ID: 12936591