Which one would be the best choice to use for an affinity chromatography to purify a DNA polymerase?

Question

Which one would  be the best choice to use for an affinity chromatography to purify a DNA polymerase?

BlackTom AI · Accepted Answer

Let's break down the question and the options to understand which ligand would be most appropriate for affinity chromatography aimed at purifying DNA polymerase.
Option 1: ssDNA. DNA polymerases interact with DNA as their substrate; using single-stranded DNA as the affinity ligand could exploit the enzyme's natural binding site for DNA. This often helps selectively capture polymerase from a mixture because the enzyme binds the immobilized DNA and is retained while other proteins with no strong affinity for DNA are washed away. 
Option 2: a positively charged molecule. While many proteins interact with charged surfaces, a positively charged ligand would lack the specificity needed to selectively capture DNA polymerase. It would attract many acidic (negatively charged) proteins non-specifically and is unlikely to provide the selective binding required for purification. 
Option 3: dNTPs. Deoxynucleotide triphosphates are the substrates of DNA polymerases, but they are small, highly soluble molecules. Immobilizing dNTPs on a chromatography matrix would not create a stable or specific interaction sufficient to retain the polymerase selectively; many other nucleic-acid processing enzymes or proteins could also interact or be displaced, reducing selectivity. 
Option 4: None of the above. Given that there is a plausible ligand among the options (ssDNA) that aligns with the enzyme’s substrate-binding characteristics, selecting 'None of the above' would ignore a reasonable affinity strategy. 
In summary, the rationale for considering ssDNA rests on the enzyme’s natural affinity for DNA substrates, which can be harnessed to capture the polymerase specifically. The other choices either lack specificity, rely on generic electrostatic interactions, or propose substrates unlikely to create a stable, selective binding in an affinity purification context.

Which one would be the best choice to use for an affinity chromatography to purify a DNA polymerase? 单项选择题

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