Total Protein Expression
Total 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.
11:32
Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
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Cited by 11 •
2016
Inherited cardiac arrhythmias are often caused by mutations that alter the surface delivery of one or more ion channels. Here, we adapt flow cytometry assays to provide a quantification of the relative total and cell surface protein expression of recombinant ion channels expressed in tsA-201 cells.
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.
08:31
Total Protein Extraction and 2-D Gel Electrophoresis Methods for Burkholderia Species
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Cited by 2 •
2013
Members of the Burkholderia genus are pathogens of clinical importance. We describe a method for total bacterial protein extraction, using mechanical disruption, and 2-D gel electrophoresis for subsequent proteomic analysis.
12:48
The Multifaceted Benefits of Protein Co-expression in Escherichia coli
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Cited by 4 •
2015
Protein co-expression is a powerful alternative to the reconstitution in vitro of protein complexes, and is of help in performing biochemical and genetic tests in vivo. Here we report on the use of protein co-expression in Escherichia coli to obtain protein complexes, and to tune the mutation frequency of cells.
FAQs
Protein abundance reflects a balance among production, accumulation, and removal. DNA is transcribed into messenger RNA, and ribosomes translate those transcripts into proteins; however, the final amount also depends on how rapidly proteins are degraded. Cellular conditions can shift these processes, so a measured total level represents the combined outcome of synthesis, persistence, and environmental state.
Transcription and translation contribute at different stages. Transcription copies information from DNA into messenger RNA, whereas translation uses that RNA as a template for protein production at ribosomes. Examining total protein expression therefore provides a downstream view of gene activity rather than a direct measure of DNA alone, linking genetic information to the proteins present in a sample.
Genetic and environmental factors can change total protein expression by altering cellular activity and the balance between production and degradation. Consequently, two samples may contain different overall protein levels even when the comparison concerns the same type of biological material. Interpreting such differences requires attention to the conditions under which each sample developed or was maintained.
Comparing total protein expression across samples can expose shifts in cellular function associated with genetic or environmental differences. A higher or lower overall protein level may indicate that the samples are responding differently, but the measurement is broad: it summarizes accumulated proteins rather than identifying which individual protein caused the change. This makes comparison useful for detecting global patterns.
Measurements are especially informative when biology changes over time or in response to a condition. Growth, differentiation, stress responses, and disease-related changes are contexts in which protein levels can vary. Tracking total expression in these settings can indicate that cellular activity has shifted and can support broader interpretation of how cells respond or acquire altered states.
In biotechnology and drug development, total protein expression supplies a broad readout for evaluating cellular responses and functional changes. In molecular biology, it helps connect altered gene activity with changes in the protein content of a sample. Because the measure is global, it can support initial assessment of a response while leaving the specific proteins responsible for that response unresolved.