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Misiura A, Shen H, Tauzin L, Dutta C, Bishop LDC, Carrejo NC, Zepeda O J, Ramezani S, Moringo NA, Marciel AB, Rossky PJ, Landes CF. Single-Molecule Dynamics Reflect IgG Conformational Changes Associated with Ion-Exchange Chromatography. Anal Chem 2021; 93:11200-11207. [PMID: 34346671 DOI: 10.1021/acs.analchem.1c01799] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Conformational changes of antibodies and other biologics can decrease the effectiveness of pharmaceutical separations. Hence, a detailed mechanistic picture of antibody-stationary phase interactions that occur during ion-exchange chromatography (IEX) can provide critical insights. This work examines antibody conformational changes and how they perturb antibody motion and affect ensemble elution profiles. We combine IEX, three-dimensional single-protein tracking, and circular dichroism spectroscopy to investigate conformational changes of a model antibody, immunoglobulin G (IgG), as it interacts with the stationary phase as a function of salt conditions. The results indicate that the absence of salt enhances electrostatic attraction between IgG and the stationary phase, promotes surface-induced unfolding, slows IgG motion, and decreases elution from the column. Our results reveal previously unreported details of antibody structural changes and their influence on macroscale elution profiles.
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Affiliation(s)
- Anastasiia Misiura
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Hao Shen
- Department of Chemistry and Biochemistry, Kent State University, 800 E Summit Street, Kent, Ohio 44240, United States
| | - Lawrence Tauzin
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Chayan Dutta
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Logan D C Bishop
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Nicole C Carrejo
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Jorge Zepeda O
- Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Shahryar Ramezani
- Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Nicholas A Moringo
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Amanda B Marciel
- Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Peter J Rossky
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States.,Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States.,Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Christy F Landes
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States.,Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States.,Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States.,Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
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