The production of bispecific antibodies adds a challenge for scientists in the cell line screening process since many other conformations of antibodies can be produced by the cells. If screening is based only on Protein A titer, good pools and clone candidates might be discarded. For this reason, a high-throughput assay using the Octet® HTX system to identify pools and clones with higher concentrations of bispecific antibodies was developed.
This novel BLI approach offers an easy screening method and workflow that assesses bsAb interactions in a versatile, label-free, and easy-to-use format.
There is currently a limitation in technologies that allow for quantitative functional assessment of two interactions to one bispecific molecule in the market. The AppNote shows an easy method for bsAb evaluation. Utilizing Protein A and HIS1K biosensors to identify conditions quickly that are suitable for quantitative measurement of bispecific binding.
By analyzing specific binding results in addition to IgG titer in a single high-throughput instru-ment, the binding activity of a bispecific molecule to both targets can be assessed to rank the top pools/clones during cell line development. The results obtained from the Octet binding assay shown have been validated using other analytical methods such as RP-HPLC, CE-SDS, SPR, and LC-MS to show that binding results can be correlated to the purity of the bsAb from the samples tested.