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Identification of Escherichia coli ygaQ and rpmG as novel mitomycin C resistance factors implicated in DNA repair

Bolt, Edward L.; Jenkins, Tabitha; Russo, Valeria Moreira; Ahmed, Sharlene; Cavey, James; Cass, Simon

Authors

Edward L. Bolt ed.bolt@nottingham.ac.uk

Tabitha Jenkins

Valeria Moreira Russo

Sharlene Ahmed

James Cavey

Simon Cass

Abstract

Using the ASKA (A Complete Set of E. coli K-12 ORF Archive) library for genome-wide screening of E. coli proteins we identified that expression of ygaQ and rpmG promotemitomycin C resistance (MMCR). YgaQ mediated MMCR was independent of homologous recombination involving RecA or RuvABC, but required UvrD. YgaQ is an uncharacterized protein homologous to a-amylases that we identified to have nuclease activity directed to single stranded DNA of 5’ flaps. Nuclease activity was inactivated by mutation of two amino acid motifs, which also abolished MMCR. RpmG is frequently annotated as a bacterial ribosomal protein, although forms an operon with MutM glycosylase and a putative deubiquitinating enzyme, YicR. RpmG associated MMCR was dependent on MutM. MMCR from RpmG resembles DNA repair phenotypes reported for ‘idiosyncratic ribosomal proteins’ in eukaryotes.

Journal Article Type Article
Publication Date Dec 24, 2015
Journal Bioscience Reports
Print ISSN 0144-8463
Electronic ISSN 1573-4935
Publisher Portland Press
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1042/BSR20150249
Publisher URL http://www.bioscirep.org/content/early/2015/12/21/BSR20150249
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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