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J Bacteriol. 1992 December; 174(24): 8023-8029

research-article

Molecular and genetic characterization of an Alcaligenes eutrophus insertion element.

Institute of Radiation Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China.

ABSTRACT

An insertion element, ISAE1, was discovered during the molecular analysis of mutants defective in the autotrophic growth (Aut-) of Alcaligenes eutrophus H1-4, a mitomycin C-generated derivative of strain H1. ISAE1 is 1,313 bp long, has 12-bp nearly perfect inverted terminal repeats, and contains an open reading frame that has a coding capacity of 408 amino acids. Direct repeats of 8 bp were generated by insertion of ISAE1 into chromosomes or plasmids. Most insertion were found in the AT-rich target sites. The distribution of ISAE1 is limited to A. eutrophus H1 (ATCC 17698) and H16 (ATCC 17699). Variants with newly transposed copies of ISAE1 could be isolated at an elevated frequency by changing the growth conditions.

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