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Journal of Bacteriology, December 2001, p. 7182-7189, Vol. 183, No. 24
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.24.7182-7189.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Hydrogen Peroxide Fluxes and Compartmentalization inside Growing Escherichia coli

Lauren Costa Seaver and James A. Imlay*

Department of Microbiology, University of Illinois, Urbana, Illinois 61801

Received 9 July 2001/Accepted 20 September 2001

Escherichia coli generates about 14 µM hydrogen peroxide (H2O2) per s when it grows exponentially in glucose medium. The steady-state intracellular concentration of H2O2 depends on the rates at which this H2O2 is dissipated by scavenging enzymes and by efflux from the cell. The rates of H2O2 degradation by the two major scavenging enzymes, alkyl hydroperoxide reductase and catalase, were quantified. In order to estimate the rate of efflux, the permeability coefficient of membranes for H2O2 was determined. The coefficient is 1.6 × 10-3 cm/s, indicating that permeability is substantial but not unlimited. These data allowed internal H2O2 fluxes and concentrations to be calculated. Under these growth conditions, Ahp scavenges the majority of the endogenous H2O2, with a small fraction degraded by catalase and virtually none persisting long enough to penetrate the membrane and exit the cell. The robust scavenging activity maintains the H2O2 concentration inside glucose-grown cells at <10-7 M, substantially below the level (10-6 M) at which toxicity is evident. When extracellular H2O2 is present, its flux into the cell can be rapid, but the internal concentration may still be an order of magnitude lower than that outside. The presence of such gradients was confirmed in experiments that revealed different degrees of oxidative stress in cocultured scavenger-deficient mutants. The limited permeability of membranes to H2O2 rationalizes the compartmentalization of scavenging systems and predicts that bacteria that excrete redox-cycling drugs do not experience the same H2O2 dose that they impose on their competitors.

* Corresponding author. Mailing address: Department of Microbiology, University of Illinois, Urbana, IL 61801. Phone: (217) 333-5812. Fax: (217) 244-6697. E-mail: jimlay{at}uiuc.edu.

Journal of Bacteriology, December 2001, p. 7182-7189, Vol. 183, No. 24
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.24.7182-7189.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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