Bacterial Expression System
Bacterial Expression System - Related Videos
02:43
Transfection of an Inducible Gene Expression System into Cells Expressing a Bacterial Effector Protein
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2025
Source: Berens, C. et al. Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling. J. Vis. Exp. (2015)This video demonstrates the use of an inducible expression system to identify where the bacterial effector protein CaeB disrupts the host apoptotic cascade. It outlines the steps for transfecting CaeB-expressing cells with a tetracycline-responsive system to induce pro-apoptotic gene expression in order to identify the point of...
03:32
Cell-Free Protein Expression Using a Bacterial Crude Cell Extract
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2025
Source: Wiegand, D. J., et al. Cell-free Protein Expression Using the Rapidly Growing Bacterium Vibrio natriegens. J. Vis. Exp. (2019).This video demonstrates the use of a bacterial cell-free protein expression system based on Vibrio natriegens crude lysate to perform coupled in vitro transcription and translation. It highlights the preparation of a master mix with essential components and the step-by-step synthesis of functional proteins from a DNA template.
03:01
Detection of Target Enzyme Expression in Genetically Modified Bacterial Cells
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2025
Source: Kim, H. et. al., Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System. J. Vis. Exp. (2016)This video demonstrates a genetic screening method to detect enzyme expression using metagenomic fosmid libraries and chromogenic substrates. Flow cytometry identifies and isolates single cells producing colored products, enabling high-throughput selection of active enzyme-expressing cells.
29:41
Bacterial Gene Expression Analysis Using Microarrays
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Cited by 3 •
2007
08:51
Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling
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Cited by 11 •
2015
The method described here is used to induce the apoptotic signaling cascade at defined steps in order to dissect the activity of an anti-apoptotic bacterial effector protein. This method can also be used for inducible expression of pro-apoptotic or toxic proteins, or for dissecting interference with other signaling pathways.
FAQs
The promoter determines where transcription begins and places the introduced gene under regulatory control. When the relevant expression conditions are met, bacterial machinery transcribes the gene into messenger RNA, which then serves as the template for protein synthesis. This control connects the genetic design of the expression vector with the amount and timing of recombinant protein production.
An inducible signal makes protein production dependent on a deliberate experimental trigger rather than occurring continuously by default. This adds control over when the introduced gene is expressed and helps researchers coordinate gene activation with bacterial cultivation. As a result, the system can be organized around a defined production stage instead of relying on unregulated expression throughout the experiment.
The expression vector carries the introduced gene and the regulatory elements needed for its transcription, while the bacterial host supplies the cellular machinery for producing messenger RNA and protein. Transformation places the vector inside the host, linking the designed genetic construct to the cell-based processes that generate the recombinant product.
Protein production proceeds through two linked stages. First, the introduced gene is transcribed into messenger RNA under promoter control. Next, bacterial ribosomes read that messenger RNA and assemble the corresponding protein. This sequence explains why vector design and transcriptional regulation directly influence the final recombinant product obtained from the cells.
A typical workflow begins by inserting the gene of interest into an expression vector and placing it under promoter control. The resulting construct is introduced into bacterial cells by transformation, after which expression is activated when the relevant signal is provided. The cells then produce the encoded recombinant protein for collection and study.
This approach is useful when investigators need a practical source of a recombinant protein for studying its function or preparing a research reagent. It also supports production of enzymes, antigens, and therapeutic proteins. Rapid production, scalable output, and relatively simple culture requirements make the technique relevant across molecular biology and biotechnology.
Within biological techniques, bacterial expression connects molecular cloning with experimentally useful protein production. Researchers can translate a designed genetic construct into material for protein-function studies, protein engineering, or manufacturing-related work. Its broad utility comes from combining an accessible cell platform with vector-based control of transcription and ribosome-mediated synthesis.