ArdA proteins from different mobile genetic elements can bind to the EcoKI Type i DNA methyltransferase of E. coli K12

K. Chen, M. Reuter, B. Sanghvi, G.A. Roberts, L.P. Cooper, M. Tilling, G.W. Blakely, D.T.F. Dryden

Research output: Contribution to journalArticlepeer-review

Abstract

Anti-restriction and anti-modification (anti-RM) is the ability to prevent cleavage by DNA restriction-modification (RM) systems of foreign DNA entering a new bacterial host. The evolutionary consequence of anti-RM is the enhanced dissemination of mobile genetic elements. Homologues of ArdA anti-RM proteins are encoded by genes present in many mobile genetic elements such as conjugative plasmids and transposons within bacterial genomes. The ArdA proteins cause anti-RM by mimicking the DNA structure bound by Type I RM enzymes. We have investigated ArdA proteins from the genomes of Enterococcus faecalis V583, Staphylococcus aureus Mu50 and Bacteroides fragilis NCTC 9343, and compared them to the ArdA protein expressed by the conjugative transposon Tn916. We find that despite having very different structural stability and secondary structure content, they can all bind to the EcoKI methyltransferase, a core component of the EcoKI Type I RM system. This finding indicates that the less structured ArdA proteins become fully folded upon binding. The ability of ArdA from diverse mobile elements to inhibit Type I RM systems from other bacteria suggests that they are an advantage for transfer not only between closely-related bacteria but also between more distantly related bacterial species.
Original languageEnglish
Pages (from-to)505-511
Number of pages7
JournalBBA - Proteins and Proteomics
Volume1844
Issue number3
DOIs
Publication statusPublished - 1 Mar 2014

Fingerprint

Dive into the research topics of 'ArdA proteins from different mobile genetic elements can bind to the EcoKI Type i DNA methyltransferase of E. coli K12'. Together they form a unique fingerprint.

Cite this