Cell-free Protein Expression
Cell-free Protein Expression - Related Videos
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
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.
09:03
HeLa Based Cell Free Expression Systems for Expression of Plasmodium Rhoptry Proteins
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Cited by 16 •
2015
Expression of malarial proteins in cell based systems remains challenging. We demonstrate two step and one step IVT (in vitro translation) cell free expression systems for expressing malarial recombinant rhoptry proteins from HeLa cells. We use a Ni-resin affinity based purification system to purify the rhoptry proteins.
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...
07:09
A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells
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Cited by 17 •
2012
In the post-human genomics era, the availability of recombinant proteins in native conformations is crucial to structural, functional and therapeutic research and development. Here, we describe a test- and large-scale protein expression system in human embryonic kidney 293T cells that can be used to produce a variety of recombinant proteins.
FAQs
The template provides the information used first for transcription and then for translation. In the reaction mixture, enzymes transcribe DNA into RNA when DNA is used, while an RNA template can direct translation more directly. Ribosomes interpret the resulting instructions, and amino acids become the building blocks incorporated into the protein product.
Energy and cofactors support the biochemical reactions required for transcription and translation. They work alongside ribosomes, enzymes, and amino acids rather than serving as interchangeable substitutes for them. Supplying these components helps maintain the molecular activities needed to convert template information into protein within the controlled reaction mixture.
Because the reaction does not require cell growth, it avoids committing resources to maintaining and reproducing a living host. It also lacks the membrane barriers present in intact cells. These features give researchers more direct control over reaction conditions and can make it practical to investigate proteins that are toxic to cells or otherwise difficult to produce.
A cell lysate system uses molecular machinery obtained from disrupted cells, whereas a reconstituted system is assembled from the required biological components. Both formats must provide ribosomes, enzymes, amino acids, energy, and cofactors for expression. This distinction gives bioengineers a choice between using a cellular molecular mixture and constructing a more explicitly defined reaction system.
A typical setup begins by selecting a DNA or RNA template for the desired protein. The template is then combined with a cell lysate or reconstituted system containing the machinery and supplies required for transcription and translation. Researchers adjust the reaction conditions and allow the mixture to produce the encoded protein, without first growing a cell culture.
The reaction needs a DNA or RNA template, a source of molecular machinery, and the substrates and supporting factors required for synthesis. Key ingredients identified for these systems include ribosomes, enzymes, amino acids, energy, and cofactors. Together, these materials provide both the information and biochemical capacity needed to generate the target protein.
Bioengineers use the method to prototype genetic circuits, develop biosensors, and synthesize enzymes. Its controllable reaction environment allows expression designs to be adjusted without relying on cell growth, which supports rapid testing of engineered biological systems. The same approach can connect molecular design with functional outputs in circuit and sensing applications.
Cell-free systems support therapeutic protein research and on-demand manufacturing, extending their value beyond laboratory expression studies. Researchers can investigate protein production without the growth and membrane constraints of living cells, while controlled mixtures allow reaction conditions to be adjusted for particular goals. These capabilities are especially relevant when rapid, flexible production is important.