Related Experiment Video
Updated: Apr 11, 2026
07:10
A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
Published on: February 19, 2019
9.6K
The Staphylococcus aureus protein-coding gene gdpS modulates sarS expression via mRNA-mRNA interaction
Chuan Chen1, Xu Zhang1, Fei Shang2
1School of Life Sciences and CAS Key Laboratory of Innate Immunity and Chronic Disease, University of Science and Technology of China, Hefei, Anhui, China.
Infection and Immunity
|June 10, 2015
Summary
The GGDEF domain protein GdpS regulates Staphylococcus aureus virulence by stabilizing sarS mRNA. This RNA-RNA interaction impacts the expression of the major surface protein Spa, revealing a novel regulatory pathway.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Pathogenesis
Background:
- Staphylococcus aureus is a significant Gram-positive pathogen causing diverse infections.
- Bacterial virulence factors are tightly regulated by environmental cues.
- GGDEF domain protein from Staphylococcus (GdpS) is a known virulence regulator, distinct from c-di-GMP synthesis.
Purpose of the Study:
- To elucidate the mechanism by which GdpS regulates virulence factors in S. aureus.
- To investigate the relationship between GdpS, sarS, and spa expression.
- To determine if GdpS directly impacts sarS transcript levels.
Main Methods:
- Site-directed mutagenesis and complementation experiments were performed.
- RNA-RNA base pairing interactions were analyzed.
- mRNA half-life assays were conducted for sarS in wild-type and gdpS mutant strains.
Main Results:
- GdpS does not regulate sarS transcript levels transcriptionally.
- GdpS directly binds to the 5' untranslated region (5'UTR) of sarS mRNA via RNA-RNA base pairing.
- GdpS stabilizes sarS mRNA, leading to increased mRNA levels and consequently influencing Spa expression.
Conclusions:
- GdpS positively regulates sarS mRNA levels through a post-transcriptional RNA-RNA interaction.
- This mechanism highlights a novel RNA-dependent pathway for virulence factor regulation in S. aureus.
- GdpS represents a potential target for therapeutic intervention against S. aureus infections.
Related Concept Videos
01:25Mechanism of Antibiotic Resistance in MRSA
132
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and...
132
01:29Translational Regulation
854
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
854
01:28Global Regulatory Systems
922
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
922
01:25Clinical Significance of Antibiotic Resistance
52
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
52
01:09GPCRs Regulate Adenylyl Cylase Activity
8.3K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
8.3K
02:11Reporter Genes
13.8K
Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
13.8K