Protein Expression Analysis
Protein Expression Analysis - 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.
06:32
Reverse Phase Protein Arrays Based Protein Expression Analysis: A Procedure for Simultaneous Quantification of Expression of Multiple Proteins from Cell Lysate
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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.
11:25
Quantitative Analysis of Protein Expression to Study Lineage Specification in Mouse Preimplantation Embryos
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Cited by 42 •
2016
This protocol presents a method to perform quantitative, single-cell in situ analysis of protein expression to study lineage specification in mouse preimplantation embryos. The procedures necessary for collection of blastocysts, whole-mount immunofluorescent detection of proteins, imaging of samples on a confocal microscope, and nuclear segmentation and image analysis are described.
02:58
Immunoblot Analysis of Apoptosis Inhibition in Host Cells Expressing an Antiapoptotic Bacterial Protein
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2026
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 immunoblotting to assess apoptosis inhibition by the bacterial effector protein CaeB in human cells. It outlines the steps for detecting apoptotic markers following doxycycline-induced expression of pro-apoptotic proteins in host cells expressing the effector.
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.
FAQs
Selective molecular recognition is central: antibodies bind target proteins in immunoblotting, immunostaining, and enzyme-linked assays, whereas mass spectrometry detects peptides. The signal generated after binding or peptide detection is compared across samples and controls. This design connects an observed measurement to a specific protein and supports estimates of relative abundance under different experimental conditions.
Abundance and distribution answer different questions. Measurements from tissue or cultured neurons can show whether a target protein changes in amount, while immunostaining can reveal where the protein is located within the examined material. Considering both dimensions helps distinguish a broad change in protein production from redistribution across cells or regions, strengthening interpretation of neuronal state and function.
Antibody-based assays depend on selective binding to a chosen target, so they support focused measurement of named proteins. Mass spectrometry instead uses peptide detection, applying a different molecular readout to the sample. Comparing these approaches helps researchers match the detection principle to the study design, whether the experiment centers on selected proteins or profiles measured across conditions.
A typical comparison begins with samples from defined conditions, such as drug-exposed material or tissue after injury. Researchers select an assay, detect target proteins or peptides, and compare the resulting signals with appropriate controls. Keeping the biological source and comparison conditions explicit allows changes in protein profiles to be interpreted in relation to neuronal development, signaling, or response.
Protein profiles can be used to examine synaptic signaling, neuronal development, neurodegenerative disease, and responses to drugs or injury. In each case, comparing protein abundance or distribution across conditions can identify molecular changes associated with the biological state being studied. These measurements therefore connect cellular or tissue observations with pathway-level questions in neuroscience.
Observed changes do not by themselves establish a complete mechanism, but they can identify pathways that warrant mechanistic investigation. The same profiles may also support biomarker development when a protein pattern is associated with a disease state, treatment response, or injury response. Their value comes from linking measured molecular differences to clearly defined experimental comparisons and controls.