Higher Order Analysis of Protein Structure of Therapeutic Monoclonal Antibody by Circular Dichroism Spectroscopy

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Puntawit Natakul
Anurak Muangsaguan


       Therapeutic monoclonal antibodies (mAb) are protein drugs that have a unique amino acid structure. When there are any changes in the structure due to environmental condition; pH, temperature or increasing production. Their safety, quality and efficacy may be affected. The determination of their higher order protein structure is performed in the in-process control and drug substances but not in the finished products. The purpose of this study was to analyze the protein structure of 5 mAb drugs (4 reference drugs and 1 biosimilar drug) registered in Thailand, using the circular dichroism spectroscopy technique in two ranges of wavelengths: 190-250 nm (far-UV) and 250-350 nm (near-UV). The study demonstrated that the protein structures of all samples showed the specific pattern depending on the product type and the results were conformed to those as their registrations. In addition, we found that the protein structure of the biosimilar mAb drug was similar to its reference drug.


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