The Sinorhizobium meliloti Insertion Sequence (IS) Element ISRm14 Is Related to a Previously Unrecognized IS Element Located Adjacent to the Escherichia coli Locus of Enterocyte Effacement (LEE) Pathogenicity Island |
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| Authors: | Susanne Schneiker Bob Kosier Alf Pühler Werner Selbitschka |
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| Institution: | Lehrstuhl für Genetik, Universit?t Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany, DE
Institut für Biologie I, ?kologie des Bodens, RWTH Aachen, Worringer Weg1, D-52056 Aachen, Germany, DE
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| Abstract: | ISRm14 is 2695 basepairs (bp) in size and bordered by 22 bp imperfect inverted repeats (IRs). A 9-bp target sequence is duplicated
upon ISRm14 transposition. The DNA strand that putatively encodes the transposase enzyme carries three open reading frames (ORFs) designated
ORFs1 to 3, which specify putative proteins of 15.9 kDa, 13.1 kDa, and 61.1 kDa, respectively. According to its structural
characteristics, ISRm14 belongs to the recently proposed IS66 family of IS elements. The ORFs1 to 3 encoded putative proteins displayed significant similarities to ORFs of the previously
unrecognized IS element ISEc8, which is inserted adjacent to the locus of enterocyte effacement (LEE) pathogenicity island of Escherichia coli EDL933. Analyses of the distribution of ISRm14 in a natural S. meliloti population showed its widespread occurrence in 66% of the strains tested with a copy number ranging from 1 to 6.
Received: 13 May 1999 / Accepted: 14 June 1999 |
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