Egfp Overexpression
Egfp Overexpression - Related Videos
05:16
Detecting Histone Modifications in Yeast Cells with Neurodegenerative Protein Overexpression
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2025
Source: Bennett, S. A., et al., Characterizing Histone Post-translational Modification Alterations in Yeast Neurodegenerative Proteinopathy Models. J. Vis. Exp. (2019).This video demonstrates the procedure of assessing histone modifications in yeast cells overexpressing neurodegenerative proteins. The steps include cell lysis, centrifugation, electrophoresis, membrane transfer, and antibody-based detection of modified histones.
08:13
Overexpressing and Purifying a Toxic Nuclease from Escherichia coli
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2025
This article describes a methodology for overexpressing recombinant Nsp15, a toxic nuclease, in a C41(DE3) expression system, followed by purification of the tagged protein utilizing affinity and size exclusion chromatography. These protocols can be adapted for other challenging toxic proteins.
08:12
Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
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Cited by 5 •
2011
We describe how to perform retroviral or lentiviral infections of overexpression or shRNA-containing constructs in the human Ramos B-cell line and how to measure somatic hypermutation in these cells.
11:43
Easy Measurement of Diffusion Coefficients of EGFP-tagged Plasma Membrane Proteins Using k-Space Image Correlation Spectroscopy
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Cited by 37 •
2014
This paper provides a step by step guide to the fluctuation analysis technique k-Space Image Correlation Spectroscopy (kICS) for measuring diffusion coefficients of fluorescently labeled plasma membrane proteins in live mammalian cells.
10:03
Development of Leishmania Species Strains with Constitutive Expression of eGFP
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2023
Here, we describe the methodology used for generating L. panamensis and L. donovani strains expressing the gene for eGFP as a stable integrated transgene using the pLEXSY system. Transfected parasites were cloned by limiting dilution, and clones with the highest fluorescence intensity in both species were selected for further use in drug screening assays.
FAQs
The promoter on an expression construct controls transcription of the EGFP coding sequence, influencing how much messenger RNA is produced and, consequently, how much protein can be translated. Changing promoter activity can therefore alter fluorescence intensity and the strength of the reporter signal. This makes promoter choice important when evaluating gene regulation or comparing expression conditions.
After translation, the EGFP protein forms a chromophore within its structure. Excitation of this chromophore causes the protein to emit green light, providing a measurable signal from cells containing the construct. Because signal formation depends on protein production and chromophore maturation, fluorescence connects expression of the introduced sequence with a visible cellular readout.
Very high EGFP levels may perturb normal cell physiology rather than simply report it. A strong fluorescent signal can therefore indicate abundant reporter production while also reflecting effects caused by overexpression itself. Researchers must interpret changes in cell behavior alongside fluorescence, especially when using the system to study localization, gene regulation, or live cellular responses.
Fluorescence can be measured without destroying the labeled cells, allowing molecular activity to be connected with cellular outcomes over observation periods. This non-destructive feature supports live-cell imaging and lineage tracing, whereas a destructive measurement would not preserve the same cells for continued observation. The approach is therefore useful when cell behavior matters alongside expression.
A typical setup introduces an EGFP coding sequence into cells using an expression construct. The construct places the sequence under the control of a promoter, after which transcription and translation produce the protein. Researchers then assess the resulting green fluorescence and relate it to the intended expression, localization, transfection, or gene-regulation question.
The method is useful when researchers need to observe gene expression or protein localization while cells remain available for imaging. Fluorescent cells can also support live-cell imaging and lineage tracing, linking molecular signals with later cellular outcomes. These applications make EGFP a practical reporter for examining biological processes without requiring the observed cells to be destroyed.
Green fluorescence provides an observable readout after an EGFP construct has been introduced into cells. Its presence and intensity can help researchers assess whether an expression or transfection system is producing the intended reporter signal, while promoter-dependent production can support studies of gene regulation. Interpretation should account for possible physiological effects from excessive expression.