NDLI: Increase in UV Mutagenesis by Heat Stress on UV-Irradiated E. coli Cells

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Increase in UV Mutagenesis by Heat Stress on UV-Irradiated E. coli Cells

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Increase in UV Mutagenesis by Heat Stress on UV-Irradiated E. coli Cells

Content Provider	Springer Nature Link
Author	Saha, Swati Basu, Tarakdas
Copyright Year	2012
Abstract	When leu − auxotrophs of Escherichia coli, after UV irradiation, were grown at temperatures between 30 and 47°C, the frequency of UV-induced mutation from leu − to leu + revertant increased as the UV dose and the temperature increased. For cells exposed to a UV dose of 45 J/m2, the mutation frequency at 47°C was 1.9 times that at 30°C; for a dose of 90 J/m2, it was 3.25 times; and for 135 J/m2, it was 4.8 times. Similar enhancement of reversion frequency was observed when the irradiated cells were grown at 30°C in the presence of a heat shock inducer, ethanol (8% v/v). Heat shock-mediated enhancement of UV mutagenesis did not occur in an E. coli mutant sigma 32 (heat shock regulator protein), but sigma 32 overexpression in the mutant strain (transformed with a sigma 32-bearing plasmid) increased the UV-induced mutation frequency. These results suggest that heat stress alone has no mutagenic property, but when applied to UV-damaged cells, it enhances the UV-induced frequency of cell mutation.
Starting Page	484
Ending Page	493
Page Count	10
File Format	PDF
ISSN	00062928
Journal	Biochemical Genetics
Volume Number	50
Issue Number	5-6
e-ISSN	15734927
Language	English
Publisher	Springer US
Publisher Date	2012-01-21
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Escherichia coli Mutation UV radiation Heat shock Sigma 32 Ethanol Zoology Biochemistry Medical Microbiology Human Genetics
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biochemistry Molecular Biology Ecology, Evolution, Behavior and Systematics

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Increase in UV mutagenesis by heat stress on UV-irradiated E. coli cells.

Conformational Adaptation in the E. coli Sigma 32 Protein in Response to Heat Shock

A distinct segment of the sigma 32 polypeptide is involved in DnaK-mediated negative control of the heat shock response in Escherichia coli.

Exonuclease VII is involved in 'reckless' DNA degradation in UV-irradiated Escherichia coli.

The Escherichia coli gapA gene is transcribed by the vegetative RNA polymerase holoenzyme E sigma 70 and by the heat shock RNA polymerase E sigma 32.

Dynamic interplay between antagonistic pathways controlling the sigma 32 level in Escherichia coli.

Antibody to sigma 32 cross-reacts with DnaK: association of DnaK protein with Escherichia coli RNA polymerase.

Correlation between the 32-kDa sigma factor levels and in vitro expression of Escherichia coli heat shock genes.

Transcription of the Escherichia coli rrnB P1 promoter by the heat shock RNA polymerase (E sigma 32) in vitro.

Increase in UV Mutagenesis by Heat Stress on UV-Irradiated E. coli Cells

Similar Documents

Increase in UV mutagenesis by heat stress on UV-irradiated E. coli cells.

Conformational Adaptation in the E. coli Sigma 32 Protein in Response to Heat Shock

A distinct segment of the sigma 32 polypeptide is involved in DnaK-mediated negative control of the heat shock response in Escherichia coli.

Exonuclease VII is involved in 'reckless' DNA degradation in UV-irradiated Escherichia coli.

The Escherichia coli gapA gene is transcribed by the vegetative RNA polymerase holoenzyme E sigma 70 and by the heat shock RNA polymerase E sigma 32.

Dynamic interplay between antagonistic pathways controlling the sigma 32 level in Escherichia coli.

Antibody to sigma 32 cross-reacts with DnaK: association of DnaK protein with Escherichia coli RNA polymerase.

Correlation between the 32-kDa sigma factor levels and in vitro expression of Escherichia coli heat shock genes.

Transcription of the Escherichia coli rrnB P1 promoter by the heat shock RNA polymerase (E sigma 32) in vitro.

Increase in UV Mutagenesis by Heat Stress on UV-Irradiated E. coli Cells