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Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device

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Singlet oxygen stress in microorganisms.

J Glaeser¹, A M Nuss, B A Berghoff

¹Institut für Mikrobiologie und Molekularbiologie, Justus-Liebig-Universität Giessen, Giessen, Germany.

Advances in Microbial Physiology

|July 5, 2011

Summary

This summary is machine-generated.

Microorganisms combat photooxidative stress using protective mechanisms. In Rhodobacter sphaeroides, singlet oxygen triggers a regulatory network involving sigma factors and small RNAs to control gene expression and defend against cellular damage.

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Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

Singlet oxygen is a major cause of photooxidative stress in microorganisms.
Photosynthetic and nonphotosynthetic microbes utilize photosensitizers and cofactors to generate singlet oxygen.
Cellular macromolecules like proteins, lipids, DNA, and RNA are susceptible to singlet oxygen damage, forming harmful byproducts.

Purpose of the Study:

To investigate the regulatory mechanisms microorganisms employ to sense and respond to singlet oxygen.
To elucidate the specific pathways involved in photooxidative stress defense in Rhodobacter sphaeroides.
To understand the roles of sigma factors and small RNAs in managing singlet oxygen-induced cellular responses.

Main Methods:

Analysis of gene expression patterns in response to singlet oxygen exposure.
Investigating protein interactions and degradation pathways.
Utilizing genetic manipulation (e.g., gene deletions) to assess the function of regulatory components.
Studying the role of small noncoding RNAs and RNA chaperones in posttranscriptional regulation.

Main Results:

Singlet oxygen acts as a signal, leading to the proteolysis of the anti-sigma factor ChrR.
The extracytoplasmic function sigma factor RpoE is released and initiates the transcription of protective genes.
RpoE induces the expression of another sigma factor, RpoH(II), which regulates a distinct set of genes.
Noncoding small RNAs, often mediated by Hfq, posttranscriptionally regulate genes involved in the photooxidative stress response.

Conclusions:

Rhodobacter sphaeroides employs a complex regulatory network involving sigma factors and small RNAs to defend against photooxidative stress.
Singlet oxygen triggers a cascade of events, including transcriptional and posttranscriptional regulation, to mitigate cellular damage.
This intricate system highlights the sophisticated adaptive strategies of microorganisms to survive oxidative stress environments.