Harnessing phage defense systems to develop a Burkholderia bacterial host.

Pre-methylating plasmid DNA in Burkholderia sp. FERM BP-3421 boosts transformation efficiency nearly 3-fold versus restriction-enzyme deletion mutants, reaching 1 × 10^6 CFU/µg plasmid DNA.

• Why it matters: Innate phage-defense systems limit foreign DNA entry, creating a bottleneck for engineering non-model Burkholderia strains for high-titer production of bioactive small molecules.
• What they did: The team tested restriction-modification systems and the Kiwa defense system by deleting three restriction enzyme genes and optimizing electroporation conditions (temperature, cell density, buffer), then compared these to a DNA pre-methylation strategy using two host DNA methyltransferases.
• The result: Restriction gene deletion improved transformation nearly 7-fold, electroporation optimization added a further 40-fold, and Kiwa deletion did not improve DNA transfer in Burkholderia sp. FERM BP-3421.

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