A novel Queuovirinae lineage of Pseudomonas aeruginosa phages encode dPreQ0 DNA modifications with a single GA motif that provide restriction and CRISPR Cas9 protection in vitro

Abstract Deazaguanine DNA modifications are widespread in phages, particularly in those with pathogenic hosts. Pseudomonas phage iggy substitutes ∼16.5% of its genomic 2′-deoxyguanosine (G) with dPreQ0, and the iggy deazaguanine transglycosylase (DpdA) is unique in having a strict GA target motif, n...

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Bibliographic Details
Published in:Nucleic acids research 2023-09, Vol.51 (16), p.8663-8676
Main Authors: Olsen, Nikoline S, Nielsen, Tue K, Cui, Liang, Dedon, Peter, Neve, Horst, Hansen, Lars H, Kot, Witold
Format: Article
Language:English
Subjects:
Molecular Biology
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Summary:Abstract Deazaguanine DNA modifications are widespread in phages, particularly in those with pathogenic hosts. Pseudomonas phage iggy substitutes ∼16.5% of its genomic 2′-deoxyguanosine (G) with dPreQ0, and the iggy deazaguanine transglycosylase (DpdA) is unique in having a strict GA target motif, not observed previously. The iggy PreQ0 modification is shown to provide protection against both restriction endonucleases and Cas9 (when present in PAM), thus expanding our understanding of the deazaguanine modification system, its potential, and diversity. Phage iggy represents a new genus of Pseudomonas phages within the Queuovirinae subfamily; which have very little in common with other published phage genomes in terms of nucleotide similarity (
ISSN:0305-1048
1362-4962
DOI:10.1093/nar/gkad622