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Characterization of a Class II Defective Transposon Carrying Two Haloacetate Dehalogenase Genes from Delftia acidovorans Plasmid pUO1

By Masahiro Sota, Masahiro Endo, Keiji Nitta, Haruhiko Kawasaki and Masataka Tsuda


The two haloacetate dehalogenase genes, dehH1 and dehH2, on the 65-kb plasmid pUO1 from Delftia acidovorans strain B were found to be located on transposable elements. The dehH2 gene was carried on an 8.9-kb class I composite transposon (TnHad1) that was flanked by two directly repeated copies of IS1071, IS1071L and IS1071R. The dehH1 gene was also flanked by IS1071L and a truncated version of IS1071 (IS1071N). TnHad1, dehH1, and IS1071N were located on a 15.6-kb class II transposon (TnHad2) whose terminal inverted repeats and res site showed high homology with those of the Tn21-related transposons. TnHad2 was defective in transposition because of its lacking the transposase and resolvase genes. TnHad2 could transpose when the Tn21-encoded transposase and resolvase were supplied in trans. These results demonstrated that Tn Had2 is a defective Tn21-related transposon carrying another class I catabolic transposon

Topics: Genetics and Molecular Biology
Publisher: American Society for Microbiology
Year: 2002
DOI identifier: 10.1128/AEM.68.5.2307-2315.2002
OAI identifier:
Provided by: PubMed Central
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