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One approach to mitigate product clipping during HIV mAb CAP256-VRC26.25 cell-culture development is the addition of the protease inhibitor 4-(2-aminoethyl) benzenesulfonyl fluoride (AEBSF) to the cell-culture media. AEBSF can undergo hydrolysis to form an inactive compound, 4-(2-aminoethyl) benzenesulfonic acid. Using mass-spectrometry detection, a kinetic profile of AEBSF hydrolysis was generated for conditions simulating those of cell culture at pH 7.0 and 37 °C. It was found that increasing the pH or the temperature could accelerate AEBSF hydrolysis. The kinetic-study results in this report provide an analytical characterization and guidance when optimizing an AEBSF-addition strategy for product-clipping control during cell-culture development and offer an alternative approach for AEBSF-related clearance studies post protein production.

Hydrolysis-Kinetic Study of AEBSF, a Protease Inhibitor Used during Cell-Culture Processing of the HIV-1 Broadly Neutralizing Antibody CAP256-VRC25.26