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Antimicrobial Agents and Chemotherapy, July 1999, p. 1681-1685, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Structural Alterations in the Translational Attenuator of Constitutively Expressed ermC Genes

Christiane Werckenthin,1 Stefan Schwarz,1,* and Henrik Westh2,3

Institut für Tierzucht und Tierverhalten der Bundesforschungsanstalt für Landwirtschaft Braunschweig (FAL), 29223 Celle, Germany,1 and Department of Clinical Microbiology, Hvidovre Hospital, 2650 Hvidovre,2 and Staphylococcus Laboratory, Statens Serum Institut, 2300 Copenhagen,3 Denmark

Received 13 October 1998/Returned for modification 28 December 1998/Accepted 4 May 1999

Sequence deletions of 16, 59, and 111 bp as well as a tandem duplication of 272 bp with respect to the corresponding sequence of pT48 were identified in the regulatory regions of constitutively expressed ermC genes. Constitutive ermC gene expression as a consequence of these structural alterations is based on either the prevention of the formation of mRNA secondary structures in the translational attenuator or the preferential formation of those mRNA secondary structures which do not interfere with the translation of the ermC transcripts. A model for the development of sequence deletions in the ermC translational attenuator by homologous recombination is presented and experimentally tested by in vitro selection of constitutively expressed mutants in staphylococcal strains deficient and proficient in homologous recombination.


* Corresponding author. Mailing address: Institut für Tierzucht und Tierverhalten der Bundesforschungsanstalt für Landwirtschaft Braunschweig (FAL), Dörnbergstr. 25-27, 29223 Celle, Germany. Phone: (49) 5141-384673/77. Fax: (49) 5141-381849. E-mail: SCHWARZ{at}KTF.FAL.DE.


Antimicrobial Agents and Chemotherapy, July 1999, p. 1681-1685, Vol. 43, No. 7
0066-4804/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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