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In your own words, describe the principles involved in protein purification by affinity chromatography.
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5. Protein Techniques
Affinity Chromatography
Multiple Choice
The target protein to be purified is likely eluted from the affinity chromatography column by _______________. Explain potential advantages & disadvantages of the elution strategies.
A
Altering the pH of the mobile phase.
B
Addition of a chaotropic agent such as urea.
C
Addition of salt and/or free ligand.
D
Raising the temperature in the column.
Verified step by step guidance1
Affinity chromatography is a technique used to purify proteins based on specific interactions between the protein and a ligand attached to the column matrix.
Elution strategies involve disrupting these interactions to release the target protein from the column. Common methods include altering pH, adding chaotropic agents, or using salt and/or free ligand.
Altering the pH can change the charge properties of the protein or ligand, potentially disrupting binding. Advantages: mild conditions, minimal protein denaturation. Disadvantages: may not be effective for all protein-ligand pairs.
Chaotropic agents like urea disrupt hydrogen bonds and hydrophobic interactions, aiding in elution. Advantages: effective for strong interactions. Disadvantages: can denature proteins, requiring careful handling.
Using salt and/or free ligand competes with the protein for binding sites, effectively eluting the protein. Advantages: specific and effective for many systems. Disadvantages: may require optimization to avoid non-specific elution.
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