Engineering & Histidine Switching

Posted 2026-03-19 07:47:40

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Question: What is the primary protein engineering strategy used to create pH-sensitive binding affinity? Answer: The most common approach involves "Histidine switching," where specific residues in the complementarity-determining regions (CDRs) are mutated to Histidine. Because the imidazole side chain of Histidine becomes protonated and positively charged at acidic pH, it can trigger conformational changes or electrostatic repulsion. Utilizing advanced histidine-switch antibody engineering allows for the precise fine-tuning of the binding-dissociation kinetics required for optimal therapeutic performance.

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