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Isothermal denaturation fluorimetry vs differential scanning fluorimetry as tools for screening of stabilizers for protein freeze-drying

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Resumo:The structural maintenance of therapeutic proteins during formulation and/or storage is a critical aspect, particularly for multi-domain and/or multimeric proteins which usually exhibit intrinsic structural dynamics leading to aggregation with concomitant loss-of-function. Protein freeze-drying is a widely used technique to preserve protein structure and function during storage. To minimize chemical/physical stresses occurring during this process, protein stabilizers are usually included, their effect being strongly dependent on the target protein. Therefore, they should be screened for on a time-consuming case-by-case basis. Herein, differential scanning fluorimetry (DSF) and isothermal denaturation fluorimetry (ITDF) were employed to screen, among different classes of freeze-drying additives, for the most effective stabilizer of the model protein human phenylalanine hydroxylase (hPAH). Correlation studies among retrieved DSF and ITDF parameters with recovered enzyme amount and activity indicated ITDF as the most appropriate screening method. Biochemical and biophysical characterization of hPAH freeze-dried with ITDF-selected stabilizers and a long-term storage study (12 months, 5 ± 3 °C) showed that the selected compounds prevented protein aggregation and preserved hPAH structural and functional properties throughout time storage. Our results provide a solid basis towards the choice of ITDF as a high-throughput screening step for the identification of protein freeze-drying protectors.
Autores principais:Leandro, Paula
Outros Autores:Lino, Paulo R.; Lopes, Raquel; Leandro, João; Amaro, Mariana P.; Sousa, Paulo; Vicente, João B.; Almeida, António J.
Assunto:Cryoprotectants Differential scanning fluorimetry Enzyme replacement therapy Human phenylalanine hydroxylase Isothermal denaturation fluorimetry Lyoprotectants Protein formulation Protein freeze-drying Biotechnology Pharmaceutical Science
Ano:2023
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade Nova de Lisboa
Idioma:inglês
Origem:Repositório Institucional da UNL

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