Why is mFP placed in binding buffer?

Why is mFP placed in binding buffer?

• A. It uses a high-salt binding buffer to promote hydrophobic interactions with the resin.
• B. It lowers the salt concentration to elute proteins.
• C. It changes pH to denature proteins.
• D. It adds a fluorescent dye to visualize proteins.

Answer: (A)

High-salt binding buffer promotes hydrophobic interactions between the protein and the resin. The elevated salt concentration reduces solvation of hydrophobic surfaces, encouraging the protein’s hydrophobic regions to interact with the hydrophobic groups on the resin and causing mFP to bind firmly during the binding step. Later, binding is reversed by altering buffer conditions (often lowering salt) to elute the protein. The other options describe steps or outcomes that don’t align with why binding buffers use high salt: lowering salt is for elution, changing pH to denature is not desired in binding, and adding a fluorescent dye is for visualization.

High-salt binding buffer promotes hydrophobic interactions between the protein and the resin. The elevated salt concentration reduces solvation of hydrophobic surfaces, encouraging the protein’s hydrophobic regions to interact with the hydrophobic groups on the resin and causing mFP to bind firmly during the binding step. Later, binding is reversed by altering buffer conditions (often lowering salt) to elute the protein. The other options describe steps or outcomes that don’t align with why binding buffers use high salt: lowering salt is for elution, changing pH to denature is not desired in binding, and adding a fluorescent dye is for visualization.