BREX system of Escherichia coli distinguishes self from non-self by methylation of a specific DNA site. | Academic Article individual record
abstract

Prokaryotes evolved numerous systems that defend against predation by bacteriophages. In addition to well-known restriction-modification and CRISPR-Cas immunity systems, many poorly characterized systems exist. One class of such systems, named BREX, consists of a putative phosphatase, a methyltransferase and four other proteins. A Bacillus cereus BREX system provides resistance to several unrelated phages and leads to modification of specific motif in host DNA. Here, we study the action of BREX system from a natural Escherichia coli isolate. We show that while it makes cells resistant to phage λ infection, induction of λ prophage from cells carrying BREX leads to production of viruses that overcome the defense. The induced phage DNA contains a methylated adenine residue in a specific motif. The same modification is found in the genome of BREX-carrying cells. The results establish, for the first time, that immunity to BREX system defense is provided by an epigenetic modification.

authors
author list (cited authors)
Gordeeva, J., Morozova, N., Sierro, N., Isaev, A., Sinkunas, T., Tsvetkova, K., ... Severinov, K.
publication date
2019
published in
keywords
  • Nucleotide Motifs
  • Bacillus Cereus
  • CRISPR-Cas Systems
  • Methyltransferases
  • Phosphoric Monoester Hydrolases
  • Bacteriophage Lambda
  • DNA Methylation
  • Adenine
  • Escherichia Coli
altmetric score

7.1

citation count

6