Protein Expression Quantification
Protein Expression Quantification - Related Videos
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
0 Views •
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.
06:32
Reverse Phase Protein Arrays Based Protein Expression Analysis: A Procedure for Simultaneous Quantification of Expression of Multiple Proteins from Cell Lysate
0 Views •
2023
This video demonstrates the methodology for performing Reverse Phase Protein Arrays (RPPA) to study protein expression patterns from cell lysate. In RPPA, the lysate containing a mixture of proteins is printed on nitrocellulose slides and proteins of interest are analyzed using fluorescently labeled antibodies.
07:47
Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid
0 Views •
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.
10:33
Isolation and Characterization Of Chimeric Human Fc-expressing Proteins Using Protein A Membrane Adsorbers And A Streamlined Workflow
0 Views •
Cited by 3 •
2014
Compared with traditional affinity chromatography using protein A agarose bead-packed columns, protein A membrane adsorbers can significantly speed laboratory-scale isolation of antibodies and other Fc fragment-expressing proteins. Appropriate analysis and quantification methods can further accelerate protein processing, allowing isolation/characterization to be completed in one workday, instead of 20+ work hours.
09:03
HeLa Based Cell Free Expression Systems for Expression of Plasmodium Rhoptry Proteins
0 Views •
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.
FAQs
Standards, controls, and reference proteins determine how a measured signal becomes comparable across samples. A standard supports estimation of absolute levels, whereas controls and reference proteins help evaluate relative differences between conditions. In Protein Expression Quantification, the comparison framework therefore determines whether the result reports an estimated amount or a change relative to a defined baseline.
Antibody-based detection and mass spectrometry provide different measurement routes. Antibodies generate a signal for a selected target, whereas mass spectrometry measures the abundance of peptides associated with proteins. The selected approach determines whether the experiment emphasizes antibody-detected signal or peptide-level abundance, with standards or controls supporting meaningful comparisons between samples.
Spatial methods add cellular and anatomical context to abundance measurements. Immunofluorescence can associate a target protein with defined neural cells and circuits rather than treating the sample as an undifferentiated mixture. This helps researchers examine where neurotransmitter receptors, ion channels, synaptic proteins, or signaling molecules are found within the nervous system.
A basic workflow begins by selecting a target protein, detecting it with antibodies or mass spectrometry, and recording signal intensity or peptide abundance. Researchers then compare the measurement with standards, controls, or reference proteins to estimate relative or absolute levels. If location matters, immunofluorescence can be combined with the measurement to relate abundance to defined neural cells or circuits.
This approach can examine changes in proteins associated with neural communication and signaling, including neurotransmitter receptors, ion channels, synaptic proteins, and signaling molecules. Researchers can compare their levels across development, disease, or experimental treatment. These comparisons help identify how protein abundance varies with biological state and provide molecular measurements relevant to neuroscience investigations.
Changes in quantified levels provide a functional readout of cellular state, but their meaning depends on the protein and comparison being made. Measuring neurotransmitter receptors, ion channels, synaptic proteins, or signaling molecules can show how abundance differs across development, disease, or treatment. Pairing measurements with spatial information can connect those differences to particular neural cells and circuits.