Induced radioresistance in four strains of Escherichia coli, two with lambda lysogens
Journal Article
·
· Biophys. J.; (United States)
- Pennsylvania State Univ., University Park
Cells of E. coli that are recA/sup +/ and lex/sup +/ show a phenomenon of induced radioresistance. A preexposure to ultraviolet light, or ionizing radiation followed by incubation to allow protein synthesis, followed by treatment with rifampin to prevent further induction, renders the cells resistant to further doses of radiation. When this is attempted with lambda lysogens of the same strains, no radioresistance is seen, even though the preexposure is too small to induce lambda itself. If the lysogens are ind/sup -/, namely lambda C1857, about the normal radioresistance can be developed by pretreatment. These findings suggest that the lambda repressors can bind to single-strand breaks caused by the inducing agent and can modify the course of induction.
- OSTI ID:
- 6845057
- Journal Information:
- Biophys. J.; (United States), Journal Name: Biophys. J.; (United States) Vol. 22:3; ISSN BIOJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560131* -- Radiation Effects on Microorganisms-- Basic Studies-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANTIBIOTICS
BACTERIA
BACTERIOPHAGES
BIOLOGICAL EFFECTS
BIOLOGICAL VARIABILITY
DOSE-RESPONSE RELATIONSHIPS
DRUGS
ELECTROMAGNETIC RADIATION
ESCHERICHIA COLI
GAMMA RADIATION
GENETIC VARIABILITY
INHIBITION
IONIZING RADIATIONS
IRRADIATION
MICROORGANISMS
PARASITES
RADIATIONS
RADIOINDUCTION
RADIOSENSITIVITY
TRANSCRIPTION
ULTRAVIOLET RADIATION
VIRUSES
X RADIATION
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANTIBIOTICS
BACTERIA
BACTERIOPHAGES
BIOLOGICAL EFFECTS
BIOLOGICAL VARIABILITY
DOSE-RESPONSE RELATIONSHIPS
DRUGS
ELECTROMAGNETIC RADIATION
ESCHERICHIA COLI
GAMMA RADIATION
GENETIC VARIABILITY
INHIBITION
IONIZING RADIATIONS
IRRADIATION
MICROORGANISMS
PARASITES
RADIATIONS
RADIOINDUCTION
RADIOSENSITIVITY
TRANSCRIPTION
ULTRAVIOLET RADIATION
VIRUSES
X RADIATION