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SOS Response Induction by ß-Lactams and Bacterial Defense Against Antibiotic Lethality
Christine Miller,1Line Elnif Thomsen,2Carina Gaggero,1*Ronen Mosseri,1Hanne Ingmer,1,2Stanley N. Cohen1
The SOS response aids bacterial propagation by inhibiting celldivision during repair of DNA damage. We report that inactivationof the ftsI gene product, penicillin binding protein 3, by eitherß-lactam antibiotics or genetic mutation induces SOSin Escherichia coli through the DpiBA two-component signal transductionsystem. This event, which requires the SOS-promoting recA andlexA genes as well as dpiA, transiently halts bacterial celldivision, enabling survival to otherwise lethal antibiotic exposure.Our findings reveal defective cell wall synthesis as an unexpectedinitiator of the bacterial SOS response, indicate that ß-lactamantibiotics are extracellular stimuli of this response, anddemonstrate a novel mechanism for mitigation of antimicrobiallethality.
1 Department of Genetics, Stanford University, Stanford, CA 94305, USA. 2 Department of Veterinary Pathobiology, Royal Veterinary and Agricultural University, Stigboejlen 4, Fredericksberg C, DK-1870, Denmark.
* Present address: Departamento de Biologia Molecular, Institutode Investigaciones Biológicas Clemente Estable, Av. Italia3318, 11600 Montevideo, Uruguay.
Present address: Department of Pediatrics B, Schneider Children'sMedical Center of Israel, Petah Tiqva 49202, Israel.
Present address: Department of Veterinary Pathobiology, RoyalVeterinary and Agricultural University, Stigboejlen 4, FrederiksbergC, DK-1870, Denmark.
To whom correspondence should be addressed. E-mail: sncohen{at}stanford.edu
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