A novel ICE in the genome of Shewanella putrefaciens W3-18-1: comparison with the SXT/R391 ICE-like elements - PubMed (original) (raw)
Comparative Study
A novel ICE in the genome of Shewanella putrefaciens W3-18-1: comparison with the SXT/R391 ICE-like elements
J Tony Pembroke et al. FEMS Microbiol Lett. 2006 Nov.
Abstract
A novel R391-like ICE (integrating conjugative element) has been detected in the 4.2 MB genome of Shewanella putrefaciens W3-18-1 located on three different contigs. Assembly of the ICE encoding contigs based on similarity with R391 revealed a mosaic element of plasmid, phage and transposon-like sequences typical of SXT/R391 ICE-like elements. The element, which is 110 057 bp in length, was highly similar to R391 sequences, with most related ORFs showing >96% amino acid sequence identity. The element, designated ICESpuPO1, contained a number of inserts determining resistance to copper and other heavy metals and a broad-spectrum RND efflux pump similar to antibiotic efflux systems. The element was integrated into the Shewanella prfC gene in a manner similar to related ICE-like elements. The chromosomal element junctions contained a 17-bp SXT/R391-like attL and attR site and an unannotated ORF between attL and the ICE integrase encoding a putative recombinational directional factor necessary for excision, with 100% amino acid identity to the R391 ORF4 product.
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