Abstract：
:Tn4555 is a 12.1-kb Bacteroides antibiotic resistance transposon representative of a novel class of transmissible genetic elements that can be transferred by resident conjugative tetracycline resistance transposons (Tc(r)-elements) but are not capable of self-transfer. Previously it was shown that Tn4555 transposes by a site-specific recombination mechanism that utilizes a circular intermediate. This circular form is induced by tetracycline and it also is the substrate for conjugation. To better understand the mechanism of transposition, the entire nucleotide sequence of Tn4555 was determined and a set of genes potentially involved in transposition was identified. The transposon was 12,105 bp including a variable 6-bp coupling sequence associated with one of the transposon termini. The element had a 44.3% G + C composition and nine potential protein coding regions were observed, eight of which were encoded on the forward strand. Two putative transposition genes were found. The int gene product had significant C-terminal homology to the lambda family of integrases and the xis gene product was similar to several excisionase proteins encoded by both plasmids and conjugative transposons. The mobA mobilization gene and cfxA beta-lactamase gene of Tn4555 had been previously identified, and the remaining five open reading frames had no significant matches with sequences in the available databases. Northern hybridization analysis revealed that all Tn4555 genes except for orf-9 were expressed and two sets of genes, tnpA, int and xis, orf-5, orf-6 were organized in operons. None of the genes seemed to be induced significantly by the addition of tetracycline to cultures. Although a small 0.4-kb xis-specific transcript appeared in tetracycline-treated cultures it was not clear if this was due to an induction or if it was a specific degradation product.
journal_name
Plasmidjournal_title
Plasmidauthors
Tribble GD,Parker AC,Smith CJdoi
10.1006/plas.1999.1401keywords:
subject
Has Abstractpub_date
1999-07-01 00:00:00pages
1-12issue
1eissn
0147-619Xissn
1095-9890pii
S0147-619X(99)91401-4journal_volume
42pub_type
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