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Nucleic Acids Res. 2015 May 19;43(9):4547-57. doi: 10.1093/nar/gkv337. Epub 2015 Apr 16.

A novel family of integrases associated with prophages and genomic islands integrated within the tRNA-dihydrouridine synthase A (dusA) gene.

Author information

1
Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia.
2
Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia ian.paulsen@mq.edu.au.

Abstract

Genomic islands play a key role in prokaryotic genome plasticity. Genomic islands integrate into chromosomal loci such as transfer RNA genes and protein coding genes, whilst retaining various cargo genes that potentially bestow novel functions on the host organism. A gene encoding a putative integrase was identified at a single site within the 5' end of the dusA gene in the genomes of over 200 bacteria. This integrase was discovered to be a component of numerous genomic islands, which appear to share a target site within the dusA gene. dusA encodes the tRNA-dihydrouridine synthase A enzyme, which catalyses the post-transcriptional reduction of uridine to dihydrouridine in tRNA. Genomic islands encoding homologous dusA-associated integrases were found at a much lower frequency within the related dusB and dusC genes, and non-dus genes. Excision of these dusA-associated islands from the chromosome as circularized intermediates was confirmed by polymerase chain reaction. Analysis of the dusA-associated islands indicated that they were highly diverse, with the integrase gene representing the only universal common feature.

PMID:
25883135
PMCID:
PMC4482086
DOI:
10.1093/nar/gkv337
[Indexed for MEDLINE]
Free PMC Article

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