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Applied and Environmental Microbiology, April 2000, p. 1749-1753, Vol. 66, No. 4
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Characterization of a Novel Integrative Element, ICESt1, in the Lactic Acid Bacterium Streptococcus thermophilus

Vincent Burrus, Yvonne Roussel,dagger Bernard Decaris,* and Gérard Guédon

Laboratoire de Génétique et Microbiologie, INRA UA952, Faculté des Sciences, Université Henri Poincaré (Nancy 1), 54506 Vandoeuvre-lès-Nancy, France

Received 17 September 1999/Accepted 6 January 2000

The 35.5-kb ICESt1 element of Streptococcus thermophilus CNRZ368 is bordered by a 27-bp repeat and integrated into the 3' end of a gene encoding a putative fructose-1,6-biphosphate aldolase. This element encodes site-specific integrase and excisionase enzymes related to those of conjugative transposons Tn5276 and Tn5252. The integrase was found to be involved in a site-specific excision of a circular form. ICESt1 also encodes putative conjugative transfer proteins related to those of the conjugative transposon Tn916. Therefore, ICESt1 could be or could be derived from an integrative conjugative element.

* Corresponding author. Mailing address: Laboratoire de Génétique et Microbiologie, INRA UA952, Université Henri Poincaré (Nancy 1), Faculté des Sciences, BP239, 54506 Vandoeuvre-lès-Nancy, France. Phone: (33) 3 83 91 21 93. Fax: (33) 3 83 91 25 00. E-mail: decaris{at}nancy.inra.fr.

dagger Present address: Department of Medical Microbiology, St. Bartholomew's Hospital, West Smithfield, London, United Kingdom.

Applied and Environmental Microbiology, April 2000, p. 1749-1753, Vol. 66, No. 4
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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