Fast and reliable screening assay developed to preselect candidate Soft Rot Pectobacteriaceae Tn5 mutants showing resistance to bacteriophage infection

Robert Czajkowski , Mateusz Marcisz , Przemysław Bartnik


We present a simple, fast and inexpensive screening assay to preselect candidate Pectobacterium spp. and Dickeya spp. Tn5 mutants, which carry transposon insertions in genes putatively encoding proteins used by lytic bacteriophages to interact with host cells, for the follow-up studies. The proposed method is fast and cost-effective and it does not need any specialized laboratory equipment and/or technical support. The Tn5 mutants are generated using random transposon mutagenesis with the mini-Tn5 transposon. The obtained bacterial mutants are incubated in the presence of viable lytic bacteriophage particles in liquid bacterial growth medium supplemented with resazurin for 12 h at 28 °C in a 96-well microtiter plate assay. During the cultivation, the Tn5 mutants that are susceptible to phage infection are lysed. The mutants that are resistant to a viral infection (not lysed after contact with bacteriophages) irreversibly reduce the resazurin violet dye to pink/yellowish-colored resorufin indicating active bacterial metabolism (a positive reaction). The change of the culture color can be observed by eye. The Tn5 mutants that are positive in the screen are selected for sequencing of the Tn5 insertion site directly from bacterial genome. The proposed assay allows generation of a number of immediately-available Tn5 mutants expressing phage-resistant phenotypes that can be later selected for further examinations. As a proof-of-concept, we used this method to evaluate resistance to viral infection of Tn5 mutants of Dickeya solani strain IPO2222 and Pectobacterium parmentieri strain SCC3193 using lytic bacteriophages ɸD5 and ɸA38, respectively.
Author Robert Czajkowski (IFB/IB/DBiotech)
Robert Czajkowski,,
- Department of Biotechnology
, Mateusz Marcisz (IFB)
Mateusz Marcisz,,
- Intercollegiate Faculty of Biotechnology UG
, Przemysław Bartnik (IFB)
Przemysław Bartnik,,
- Intercollegiate Faculty of Biotechnology UG
Journal seriesEuropean Journal of Plant Pathology, ISSN 0929-1873, (N/A 100 pkt)
Issue year2019
Publication size in sheets0.50
Keywords in Englishgene fusion, survival, Pectobacterium spp., Dickeya spp., resazurin, growth, phage
ASJC Classification1102 Agronomy and Crop Science; 1108 Horticulture; 1110 Plant Science
Languageen angielski
LicenseOther; published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 01-06-2020, ArticleFromJournal
Publication indicators WoS Citations = 0.000; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.910; WoS Impact Factor: 2018 = 1.744 (2) - 2018=1.754 (5)
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