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DNA restriction-modification systems in the ethanologen, Zymomonas mobilis ZM4

  • Applied Genetics and Molecular Biotechnology
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Abstract

To better understand the DNA restriction-modification (R-M) systems for more amenable strain development of the alternative industrial ethanologen, Zymomonas mobilis, three gene knockout mutants were constructed. The gene knockout mutants were tested for their DNA restriction activities by the determination of transformation efficiency using methylated and unmethylated foreign plasmid DNAs. Inactivation of a putative mrr gene encoded by ZMO0028 (zmrr) resulted in a 60-fold increase in the transformation efficiency when unmethylated plasmid DNA was used. This indicated that the putative mrr gene may serve as a type IV restriction-modification system in Z. mobilis ZM4. To assign the function of a putative type I DNA methyltransferase encoded by ZMO1933 (putative S subunit) and ZMO1934 (putative M subunit), the putative S subunit was inactivated. The gene inactivation of ZMO1933 resulted in a 30-fold increase in the transformation efficiency when methylated plasmid DNA was introduced, indicating that the putative S subunit possibly serves as a part of functional type I R-M system(s). Growth studies performed on the mutant strains indicate inactivation of the type I S subunit resulted in a lower maximum specific glucose consumption rate and biomass yield, while inactivation of the type IV Zmrr had the opposite effect, with an increase in the maximum specific growth rate and biomass yield.

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Authors and Affiliations

  1. School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, 2052, Australia

    Aidan L. Kerr, Young Jae Jeon, Peter L. Rogers & Brett A. Neilan

  2. Faculty of Science, Charles Sturt University, Orange, 2800, Australia

    Charles J. Svenson

Authors
  1. Aidan L. Kerr
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  2. Young Jae Jeon
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  3. Charles J. Svenson
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  4. Peter L. Rogers
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  5. Brett A. Neilan
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Correspondence to Young Jae Jeon.

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Kerr, A.L., Jeon, Y.J., Svenson, C.J. et al. DNA restriction-modification systems in the ethanologen, Zymomonas mobilis ZM4. Appl Microbiol Biotechnol 89, 761–769 (2011). https://doi.org/10.1007/s00253-010-2936-1

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  • DOI: https://doi.org/10.1007/s00253-010-2936-1

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