Which statement is NOT true about Protein A as an industry-standard capture resin?

Question

BlackTom AI · Accepted Answer

Protein A binds the Fc region of IgG with high affinity, so it is the go-to affinity ligand for monoclonal antibody capture. Relevant concepts are ligand chemistry (proteinaceous vs. small-molecule), dynamic binding capacity (DBC), cleaning-in-place (CIP) chemistry (alkali/oxidants, low-pH elution), and cost drivers (recombinant ligand production and immobilization).

Step-by-step reasoning:
1. Examine the statement “It tolerates harsh cleaning agents well.” Protein A ligands are protein-based or derived from protein sequences, and are inherently sensitive to strong alkali, oxidizing agents, and repeated exposure to low-pH elutions. Standard CIP uses NaOH and other agents that can hydrolyze or denature Protein A ligands, causing ligand leaching and loss of binding capacity. Although newer engineered Protein A ligands have improved alkali tolerance, historically and in many commercial resins the cleaning tolerance is limited. Therefore the statement that Protein A tolerates harsh cleaning agents well is incorrect — this is the NOT-true option.
2. Check the remaining statements to confirm they are true:
   - “It has lower capacity than IEX resins.” Ion-exchange resins typically achieve higher mass binding capacities for generic proteins because they exploit high ligand densities and charged interactions; Protein A resins trade some capacity for very high specificity. Thus it is correct that Protein A often has lower practical capacity (per volume) compared with some IEX media.
   - “It is expensive.” Recombinant Protein A ligand production, purification, and covalent immobilization to base matrix are costly steps; plus manufacturers price affinity resins higher because they replace multiple downstream steps. This statement is true.
   - “It has limited cleaning tolerance which can shorten resin lifetime.” This restates the sensitivity issue: limited CIP tolerance leads to shorter lifetime if harsh agents are used. This is true.

Why the correct answer is correct: Because Protein A ligands are chemically/structurally vulnerable to harsh CIP conditions, the claim that they tolerate harsh cleaning agents well is false. Conclusion: The NOT-true statement is “It tolerates harsh cleaning agents well,” which matches the provided answer.

Which statement is NOT true about Protein A as an industry-standard capture resin?单项选择题

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