Exogenous Protein Expression
Exogenous Protein Expression - Related Videos
05:35
Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Cited by 4 •
2016
Here we report protocols to detect endogenous and exogenous centromere-kinetochore proteins in human cells and quantify these protein levels at centromeres-kinetochores by indirect immunofluorescent staining through the use of fixation (paraformaldehyde, acetone, or methanol fixation).
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.
12:58
Expression of Exogenous Cytokine in Patient-derived Xenografts via Injection with a Cytokine-transduced Stromal Cell Line
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Cited by 2 •
2017
Described here is a method for producing exogenous cytokine in patient-derived xenograft (PDX) mice via weekly intraperitoneal injection of a cytokine-transduced stromal cell line. This method broadens the utility of PDX and provides the option for transient or sustained exogenous cytokine delivery in a multitude of PDX models.
07:47
Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid
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Cited by 94 •
2009
A short protocol for protein staining with Coomassie Brilliant Blue (CBB) G-250 in polyacrylamide gels is described without using organic solvents or acetic acid as in the classical staining procedures with CBB.
05:30
Exogenous Mitochondrial Transfer in Differentiating Brown Adipocytes and AGPAT2-Deficient Preadipocytes
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2026
Exogenous mitochondria of human and murine origin can be internalized by differentiating preadipocytes and tracked throughout adipogenic differentiation using imaging and genetic tools. While these mitochondria physically interact with the endogenous mitochondrial network, they do not increase the expression of markers associated with mature brown adipocytes.
FAQs
Promoters determine when and how strongly the introduced coding sequence is transcribed, while selected regulatory conditions help control that activity in the host cell. These controls connect DNA delivery to messenger RNA production and subsequent translation. Adjusting them can make expression more suitable for a study, purification workflow, assay, or other planned use.
Host cells provide the transcriptional and translational machinery needed to convert the introduced gene into messenger RNA and protein. Because expression systems can be optimized by choosing suitable host cells, the host is a central experimental variable rather than a passive container. Selecting an appropriate system helps align protein production with the intended biological investigation or practical application.
A plasmid or viral vector serves as the route for delivering the DNA construct into host cells. Its role precedes transcription and translation: once the coding sequence is available in the host-cell system, cellular machinery produces messenger RNA and then protein. This separates gene delivery from the later steps of protein production.
A typical workflow begins by preparing a DNA construct containing the desired coding sequence, delivering it to selected host cells with a plasmid or viral vector, and applying regulatory conditions that support expression. Host transcription produces messenger RNA, and translation produces the protein of interest. The resulting material can then support purification, functional studies, or assay development.
Optimization focuses on three linked variables: the host cell, the promoter, and culture conditions. These choices influence how effectively the introduced coding sequence is handled by host machinery and whether the resulting protein is produced under conditions appropriate for its intended use. Researchers can therefore tailor the system for protein purification, functional analysis, or other downstream biological work.
Exogenous protein expression can supply material for protein purification and functional studies, while also supporting assay development, vaccine research, and therapeutic research. It is likewise useful for analyzing cellular pathways. The application can guide how researchers select and optimize the host cells, promoters, and culture conditions used to produce the protein.