Protein Expression Purification
Protein Expression Purification - Related Videos
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.
12:03
Expression, Isolation, and Purification of Soluble and Insoluble Biotinylated Proteins for Nerve Tissue Regeneration
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Cited by 12 •
2014
Developing biotinylatable fusion proteins has many potential applications in various fields of research. Recombinant protein engineering is a straight forward procedure that is cost-effective, providing high yields of custom-designed proteins.
12:16
High Throughput Quantitative Expression Screening and Purification Applied to Recombinant Disulfide-rich Venom Proteins Produced in E. coli
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Cited by 29 •
2014
A protocol for the quantitative, high throughput expression screening and analytical purification of fusion proteins from small-scale Escherichia coli cultures is described and applied to the expression of disulfide-rich animal venom protein targets.
15:12
Purification of the Cystic Fibrosis Transmembrane Conductance Regulator Protein Expressed in Saccharomyces cerevisiae
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Cited by 21 •
2014
Heterologous expression and purification of the cystic fibrosis transmembrane conductance regulator (CFTR) are significant challenges and limiting factors in the development of drug therapies for cystic fibrosis. This protocol describes two methods for the isolation of milligram quantities of CFTR suitable for functional and structural...
10:43
Expression, Detergent Solubilization, and Purification of a Membrane Transporter, the MexB Multidrug Resistance Protein
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Cited by 5 •
2010
In this protocol we demonstrate the expression, solubilization, and purification of a recombinantly expressed membrane protein, MexB, as a soluble protein detergent complex. MexB is a multidrug resistance membrane transporter from the opportunistic bacterial pathogen Pseudomonas aeruginosa.
FAQs
The host can influence whether the target protein folds correctly and retains biological activity after production. Bacteria, yeast, and mammalian cells provide alternative expression contexts, so the selected system affects the quality of the recovered product. This choice is especially important when purified antigens, antibodies, or pathogen-associated proteins must perform reliably in immunological or infection studies.
These chromatography methods separate the target protein from other cellular components through different properties. Affinity chromatography isolates molecules using a specific interaction, ion-exchange chromatography separates according to charge, and size-exclusion chromatography separates according to molecular size. Using one or more of these approaches helps improve purity, which directly affects the interpretation of downstream experiments.
Controlled expression conditions determine how much target protein the host produces and can influence its quality, folding, and activity. Excessive or poorly controlled production may yield material that is less suitable for study, even when the target is recovered. Careful control therefore supports consistent preparation of proteins for immunoassays, structural studies, and other applications.
A preparation can be sufficiently purified yet still be unsuitable if the protein has incorrect folding or lacks biological activity. Purity, structural quality, and function together determine whether the material behaves reliably in later experiments. This distinction matters when the protein serves as an antigen, antibody, or pathogen-associated component in immunology and infection research.
Planning begins with selecting a host for the target gene, introducing the encoding gene, and establishing controlled expression. Researchers then recover the product through cell lysis or secretion and apply an appropriate chromatography strategy to remove other cellular components. The resulting protein must retain suitable quality, folding, purity, and biological activity for its intended use.
Purified proteins support several research needs, including immunoassays, structural studies, vaccine development, and diagnostic testing. Antigens can help investigate immune recognition, while antibodies and pathogen-associated proteins provide other experimental materials. Because downstream conclusions depend on protein quality and activity, the preparation method is relevant whenever a defined protein reagent is required.
Purified antigens and pathogen-associated proteins provide defined materials for examining immune responses and developing research tools. In vaccine development, they can contribute to studies of candidate antigen preparations; in diagnostic testing, they can serve as controlled protein components. Reliable results depend on maintaining appropriate folding, purity, and biological activity throughout preparation and use.