Related Experiment Video
Updated: Jul 29, 2026
11:06
GC-based Detection of Aldononitrile Acetate Derivatized Glucosamine and Muramic Acid for Microbial Residue Determination in Soil
Published on: May 19, 2012
16.9K
Direct detection of stringent alarmones (pp)pGpp using malachite green
Muriel Schicketanz1, Magdalena Petrová2, Dominik Rejman2
1Department of Biology, University of Copenhagen Copenhagen, DK-2200 Denmark.
Microbial Cell (Graz, Austria)
|August 9, 2024
Summary
Malachite green can now detect the bacterial alarmone (p)ppGpp, aiding in developing new antibiotics. This simple method identified three novel inhibitors of bacterial stringent response proteins.
Area of Science:
- Microbiology
- Bacterial Physiology
- Drug Discovery
Background:
- The bacterial alarmone guanosine tetraphosphate ((p)ppGpp) is vital for the stringent response, influencing virulence and stress adaptation.
- Targeting (p)ppGpp synthesis or hydrolysis is a promising strategy for novel antibacterial therapies.
- Existing (p)ppGpp detection methods lack simplicity and ease of use.
Purpose of the Study:
- To establish a straightforward detection method for (p)ppGpp using malachite green.
- To identify novel inhibitors of bacterial stringent response regulators.
Main Methods:
- Utilized malachite green, a known phosphate indicator, for direct (p)ppGpp detection.
- Screened for inhibitors of SpoT, a key enzyme in (p)ppGpp metabolism in *Escherichia coli*.
Main Results:
- Malachite green effectively detected (p)ppGpp and its analogue pGpp.
- Three new inhibitors of SpoT hydrolase activity were identified.
- Demonstrated the utility of malachite green in high-throughput screening.
Conclusions:
- Malachite green offers a practical and convenient method for detecting (p)ppGpp *in vitro*.
- This approach facilitates the discovery of new antibacterial targets and drug candidates.
- The method is suitable for broad application in studying bacterial stringent response regulators.
Related Concept Videos
02:11Reporter Genes
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.
Commonly used reporter...
Commonly used reporter...
01:13Gas Chromatography: Overview of Detectors
Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
01:19Gas Chromatography: Types of Detectors-II
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...