1
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Tscheliessnig R, Silva GL, Plewka J, Jakob LA, Lichtenegger H, Jungbauer A, Dias-Cabral AC. Antibody-ligand interactions on a high-capacity staphylococcal protein A resin. J Chromatogr A 2024; 1730:465102. [PMID: 38941799 DOI: 10.1016/j.chroma.2024.465102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 06/14/2024] [Accepted: 06/16/2024] [Indexed: 06/30/2024]
Abstract
Staphylococcal protein-A affinity chromatography has been optimized for antibody purification, achieving a current capacity of up to 90 mg/ml in packed bed. The morphology of the particles, the number of antibodies bound per ligand and the spatial arrangement of the ligands were assessed by in-situ Small-angle X-ray scattering (SAXS) and scanning electron microscopy (SEM) combined with measurement of adsorption isotherms. We employed SAXS measurements to probe the nanoscale structure of the chromatographic resin. From scanning electron microcopy, the morphology and area of the beads were obtained. The adsorption isotherm revealed a bi-Langmuirian behavior where the association constant varied with the critical bulk concentration, indicating multilayer adsorption. Determining the antibody-ligand stoichiometry was crucial for understanding the adsorption mechanism, which was estimated to be 4 at lower concentrations and 4.5 at higher concentrations, suggestive of reversible protein-protein interactions. The same results were reached from the in-situ small angle X-ray scattering measurements. A stoichiometry of 6 cannot be achieved since the two protein A monomers are anchored to the stationary phase and thus sterically hindered. Normalization through ellipsoids facilitated SAXS analysis, enabling the determination of distances between ligands and antibody-ligand complexes. Density fluctuations were examined by subtracting the elliptical fit, providing insights into ligand density distribution. The dense ligand packing of TOYOPEARL® AF-rProtein A HC was confirmed, making further increases in ligand density impractical. Additionally, SAXS analysis revealed structural rearrangements of the antibody-ligand complex with increasing antibody surface load, suggesting reversible association of antibodies.
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Affiliation(s)
- Rupert Tscheliessnig
- Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna 1190, Austria; Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria; Department of Theoretical Chemistry, University of Vienna, Vienna, Austria; Bioinformatics and Computational Biology, Faculty of Computer Science, University of Vienna, Vienna, Austria
| | - Goncalo L Silva
- Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna 1190, Austria
| | - Jacek Plewka
- Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria; Department of Material Science and Process Engineering, University of Natural Resources and Life Sciences, Peter-Jordan Strasse 82, Vienna 1190, Austria
| | - Leo A Jakob
- Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna 1190, Austria; Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria
| | - Helga Lichtenegger
- Department of Material Science and Process Engineering, University of Natural Resources and Life Sciences, Peter-Jordan Strasse 82, Vienna 1190, Austria
| | - Alois Jungbauer
- Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna 1190, Austria; Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Muthgasse 18, Vienna 1190, Austria.
| | - Ana C Dias-Cabral
- CICS-UBI-Health Sciences Research Centre, University of Beira Interior, Av. Infante D. Henrique, Covilhã 6201-506, Portugal; Department of Chemistry, University of Beira Interior, R. Marquês d'Ávila e Bolama, Covilhã 6201-001, Portugal
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2
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Ambrožič R, Mravljak R, Podgornik A. Rapid, Direct, Noninvasive Method to Determine the Amount of Immobilized Protein. Anal Chem 2023; 95:5643-5651. [PMID: 36939216 PMCID: PMC10077329 DOI: 10.1021/acs.analchem.2c05402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2023]
Abstract
Protein immobilization is of utmost importance in many areas, where various proteins are used for selective detection of target compounds. Despite the importance given to determine the amount of immobilized protein, there is no simple method that allows direct, noninvasive detection. In this work, a method based on pH transition, occurring during change of solution ionic strength, was developed. The method utilized the ionic character of the immobilized protein while implementing biologically compatible buffers. Five different proteins, namely, glucose oxidase, horseradish peroxidase, bovine serum albumin, lysozyme, and protein A, were immobilized in different amounts on a porous polymeric matrix, and their pH transition was measured using lactate buffer of various concentrations and pH values. A linear correlation was found between the amount of immobilized protein and the amplitude of the pH transition, allowing the detection down to 2 nmol of immobilized protein. By changing the buffer concentration and pH, the sensitivity of the method could be tailored. Criteria based on the symmetry of the pH transition peak have been developed to determine if a particular measurement is within a linear range. In addition, a mathematical model was developed enabling prediction of pH transition profiles based solely on the protein amino acid sequence, the buffer pKa value(s), and the amount of immobilized protein.Hence, it can be used to design pH transition method experiments to achieve the required sensitivity for a target sample. Since the proposed method is noninvasive, it can be routinely applied during optimization of the immobilization protocol, for quality control, and also as an in-process monitoring tool.
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Affiliation(s)
- Rok Ambrožič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, 1000 Ljubljana, Slovenia
| | - Rok Mravljak
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, 1000 Ljubljana, Slovenia
| | - Aleš Podgornik
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, 1000 Ljubljana, Slovenia.,COBIK, Mirce 21, 5270 Ajdovščina, Slovenia
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3
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Beck J, Biechele M, Repik C, Gruber P, Furtmüller PG, Hahn R. Desorption of plasmid DNA from anion exchangers: Salt concentration at elution is independent of plasmid size and load. J Sep Sci 2023; 46:e2200943. [PMID: 36807776 DOI: 10.1002/jssc.202200943] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/13/2023] [Accepted: 02/15/2023] [Indexed: 02/20/2023]
Abstract
Detailed studies on the sorption behavior of plasmids on anion exchangers are rare compared to proteins. In this study, we systematically compare the elution behavior of plasmid DNA on three common anion exchange resins using linear gradient and isocratic elution experiments. Two plasmids of different lengths, 8 and 20 kbp, were studied and their elution characteristics were compared to a green fluorescent protein. Using established methods for determining retention characteristics of biomolecules in ion exchange chromatography lead to remarkable results. In contrast to the green fluorescent protein, plasmid DNA consistently elutes at one characteristic salt concentration in linear gradient elution. This salt concentration was the same independent of plasmid size but differed slightly for different resins. The behavior is consistent also at preparative loadings of plasmid DNA. Thus, only a single linear gradient elution experiment is sufficient to design elution in a process scale capture step. At isocratic elution conditions, plasmid DNA elutes only above this characteristic concentration. Even at slightly lower concentrations most plasmids remain tightly bound. We hypothesize, that the desorption is accompanied by a conformational change leading to a reduced number of available negative charges for binding. This explanation is supported by structural analysis before and after elution.
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Affiliation(s)
- Jürgen Beck
- Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Matthias Biechele
- Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Christoph Repik
- Baxalta Innovations GmbH, A Part of Takeda Companies, Orth an der Donau, Austria
| | - Petra Gruber
- Baxalta Innovations GmbH, A Part of Takeda Companies, Orth an der Donau, Austria
| | - Paul G Furtmüller
- Department of Chemistry, Institute of Biochemistry, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Rainer Hahn
- Department of Biotechnology, Institute of Bioprocess Science and Engineering, University of Natural Resources and Life Sciences, Vienna, Austria
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4
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Mravljak R, Stantič M, Bizjak O, Podgornik A. Noninvasive method for determination of immobilized protein A. J Chromatogr A 2022; 1671:462976. [DOI: 10.1016/j.chroma.2022.462976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 03/12/2022] [Accepted: 03/14/2022] [Indexed: 11/30/2022]
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5
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Jakob LA, Beyer B, Janeiro Ferreira C, Lingg N, Jungbauer A, Tscheließnig R. Protein-protein interactions and reduced excluded volume increase dynamic binding capacity of dual salt systems in hydrophobic interaction chromatography. J Chromatogr A 2021; 1649:462231. [PMID: 34038776 DOI: 10.1016/j.chroma.2021.462231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 04/26/2021] [Accepted: 04/28/2021] [Indexed: 10/21/2022]
Abstract
Deploying two salts in hydrophobic interaction chromatography can significantly increase dynamic binding capacities. Nevertheless, the mechanistic understanding of this phenomenon is lacking. Here, we investigate whether surface tension or ionic strength govern dynamic binding capacities of the chromatographic resin Toyopearl Butyl-650 M in dual salt systems. Small-angle X-ray scattering was employed to analyze the model proteins and the protein-resin adduct in the respective dual salt systems. The dual salt systems incorporate sodium citrate and a secondary sodium salt (acetate, sulfate, or phosphate). As model proteins, we used lysozyme, GFP, and a monoclonal antibody (adalimumab). Moreover, for the protein-resin adduct, we determined the model parameters of a self-avoiding random walk model fitted into the pair density distribution function of the SAXS data. Ionic strength is more predictive for dynamic binding capacities in HIC dual salt systems than surface tension. However, dynamic binding capacities still differ by up to 30 % between the investigated dual salt systems. The proteins exhibit extensive protein-protein interactions in the studied dual salt HIC buffers. We found a correlation of protein-protein interactions with the well-known Hofmeister series. For systems with elevated protein-protein interactions, adsorption isotherms deviate from Langmuirian behavior. This highlights the importance of lateral protein-protein interactions in protein adsorption, where monomolecular protein layers are usually assumed. SAXS analysis of the protein-resin adduct indicates an inverse correlation of the binding capacity and the excluded volume parameter. This is indicative of the deposition of proteins in the cavities of the stationary phase. We hypothesize that increasing protein-protein interactions allow the formation of attractive clusters and multilayers in the cavities, respectively.
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Affiliation(s)
- Leo A Jakob
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 18, A-1190, Austria
| | - Beate Beyer
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 18, A-1190, Austria; Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna A-1190, Austria
| | | | - Nico Lingg
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 18, A-1190, Austria; Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna A-1190, Austria
| | - Alois Jungbauer
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 18, A-1190, Austria; Austrian Centre of Industrial Biotechnology, Muthgasse 18, Vienna A-1190, Austria.
| | - Rupert Tscheließnig
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Muthgasse 18, A-1190, Austria
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6
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Kip C, Hamaloğlu KÖ, Demir C, Tuncel A. Recent trends in sorbents for bioaffinity chromatography. J Sep Sci 2021; 44:1273-1291. [PMID: 33370505 DOI: 10.1002/jssc.202001117] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/22/2020] [Accepted: 12/23/2020] [Indexed: 12/24/2022]
Abstract
Isolation or enrichment of biological molecules from complex biological samples is mostly a prerequisite in proteomics, genomics, and glycomics. Different techniques have been used to advance the efficiency of the purification of biological molecules. Bioaffinity chromatography is one of the most powerful technique that plays an important role in the isolation of target biological molecules by the specific interactions with ligands that are immobilized on different support materials. This review examines the recent developments in bioaffinity chromatography particularly over the past 5 years in the literature. Also properties of supports, immobilization techniques, types of binding agents, and methods used in bioaffinity chromatography applications are summarized.
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Affiliation(s)
- Cigdem Kip
- Chemical Engineering Department, Hacettepe University, Ankara, Turkey
| | | | - Cihan Demir
- Chemical Engineering Department, Hacettepe University, Ankara, Turkey.,Nanotechnology and Nanomedicine Division, Hacettepe University, Ankara, Turkey
| | - Ali Tuncel
- Chemical Engineering Department, Hacettepe University, Ankara, Turkey
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7
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Behere K, Yoon S. n-Layer BET adsorption isotherm modeling for multimeric Protein A ligand and its lifetime determination. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1162:122434. [PMID: 33302227 DOI: 10.1016/j.jchromb.2020.122434] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 10/25/2020] [Accepted: 10/28/2020] [Indexed: 01/14/2023]
Abstract
Langmuir and other single-layer adsorption isotherms show the binding behavior of natural Protein A ligands immobilized on a column. However, no models have been shown in literature to explain the adsorption phenomena on the recombinant high binding capacity Protein A resins. This study has characterized the Protein A binding domain distribution across the ligand with multi-layer adsorption isotherms for a recombinant Protein A resin. The adsorption data was analyzed using the Langmuir, Freundlich, Brunauer-Emmett-Teller (BET) and various other mathematical equations. The best fit of experimental data was obtained with n-layer BET model wherein the isotherms of Protein A exhibited Type IV behavior according to BET classification. Furthermore, the binding capacity was studied throughout the shelf life using the multi-layer adsorption isotherm model. Antibody adsorption isotherms of Protein A resin were obtained at preset duration of caustic incubation. The experiments were carried out for two conditions of sanitization agent, namely, caustic and caustic with salt. Static and dynamic isotherm analysis showed that a new resin had a lower binding capacity and the initial sanitization improved the binding capacity, probably by making the binding domains more accessible. The binding capacity at equilibrium, dynamic breakthrough and batch were also evaluated and reported in this paper. The study modeled the multimeric Protein A ligand and established the requirement of optimization for cleaning regime. This study provides a fundamental understanding of the binding patterns in the recombinant Protein A ligands through a working mathematical equation and improves the current knowledge of Protein A resin lifetimes.
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Affiliation(s)
- Ketki Behere
- Department of Chemical Engineering, University of Massachusetts Lowell, 1 University Ave, Lowell, MA 01854, USA
| | - Seongkyu Yoon
- Department of Chemical Engineering, University of Massachusetts Lowell, 1 University Ave, Lowell, MA 01854, USA.
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8
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Hagemann F, Adametz P, Wessling M, Thom V. Modeling hindered diffusion of antibodies in agarose beads considering pore size reduction due to adsorption. J Chromatogr A 2020; 1626:461319. [DOI: 10.1016/j.chroma.2020.461319] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/27/2020] [Accepted: 06/04/2020] [Indexed: 11/17/2022]
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9
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Bishop LD, Misiura A, Moringo NA, Landes CF. Unraveling peak asymmetry in chromatography through stochastic theory powered Monte Carlo simulations. J Chromatogr A 2020; 1625:461323. [DOI: 10.1016/j.chroma.2020.461323] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 06/03/2020] [Accepted: 06/05/2020] [Indexed: 12/29/2022]
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10
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Papachristodoulou M, Doutch J, Leung HSB, Church A, Charleston T, Clifton LA, Butler PD, Roberts CJ, Bracewell DG. In situ neutron scattering of antibody adsorption during protein A chromatography. J Chromatogr A 2020; 1617:460842. [PMID: 31928770 PMCID: PMC10986645 DOI: 10.1016/j.chroma.2019.460842] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 12/30/2019] [Accepted: 12/31/2019] [Indexed: 01/02/2023]
Abstract
A deeper understanding of the nanoscale and mesoscale structure of chromatographic adsorbents and the distribution of proteins within the media, is critical to a mechanistic understanding of separation processes using these materials. Characterisation of the media's architecture at this scale and protein adsorption within, is challenging using conventional techniques. In this study, we propose a novel resin characterisation technique that enables in-situ measurement of the structure of the adsorbed protein layer within the resin, under typical chromatographic conditions. A quartz flow-through cell was designed and fabricated for use with Small Angle Neutron Scattering (SANS), in order to measure the nanoscale to mesoscale structures of a silica based protein A chromatography resin during the monoclonal antibody sorption process. We were able to examine the pore-to-pore (˜133 nm) and pore size (˜63 nm) correlations of the resin and the in-plane adsorbed antibody molecules (˜ 4.2 nm) correlation at different protein loadings and washing buffers, in real time using a contrast matching approach. When 0.03 M sodium phosphate with 1 M urea and 10 % isopropanol buffer, pH 8, was introduced into the system as a wash buffer, it disrupted the system's order by causing partial unfolding of the adsorbed antibody, as evidenced by a loss of the in-plane protein correlation. This method offers new ways to investigate the nanoscale structure and ligand immobilisation within chromatography resins; and perhaps most importantly understand the in-situ behaviour of adsorbed proteins within the media under different mobile phase conditions within a sample environment replicating that of a chromatography column.
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Affiliation(s)
- Maria Papachristodoulou
- Department of Biochemical Engineering, University College London, Gower Street, London, WC1E 6BT, UK
| | - James Doutch
- ISIS, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon, OX11 0QX, UK
| | - Hoi Sang Beatrice Leung
- Department of Biochemical Engineering, University College London, Gower Street, London, WC1E 6BT, UK
| | - Andy Church
- ISIS, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon, OX11 0QX, UK
| | - Thomas Charleston
- ISIS, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon, OX11 0QX, UK
| | - Luke A Clifton
- ISIS, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon, OX11 0QX, UK
| | - Paul D Butler
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Dr, Gaithersburg, MD, USA; Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, USA; Department of Chemistry, The University of Tennessee Knoxville, Knoxville, TN, USA
| | - Christopher J Roberts
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, USA
| | - Daniel G Bracewell
- Department of Biochemical Engineering, University College London, Gower Street, London, WC1E 6BT, UK.
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11
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Rosa SASL, Wagner A, da Silva CL, Aires-Barros MR, Azevedo AM, Dias-Cabral AC. Mobile-Phase Modulators as Salt Tolerance Enhancers in Phenylboronate Chromatography: Thermodynamic Evaluation of the Mechanisms Underlying the Adsorption of Monoclonal Antibodies. Biotechnol J 2019; 14:e1800586. [PMID: 31305007 DOI: 10.1002/biot.201800586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 06/12/2019] [Indexed: 11/06/2022]
Abstract
Phenylboronate chromatography has been employed for bioseparation applications though details concerning the mechanisms of interaction between the ligand and macromolecules remain widely unknown. Here, the phenomena underlying the adsorption of an anti-human interleukin-8 (anti-IL8) monoclonal antibody (mAb) onto an m-aminophenylboronic acid (m-APBA) ligand in the presence of different mobile-phase modulators (NaF/MgCl 2 /(NH 4 ) 2 SO 4 ) and under different pH values (7.5/8.5/9.0) is investigated. Flow microcalorimetry (FMC) is applied to measure instantaneous heat energy transfer, providing insights about the role of specific and nonspecific interactions involved in the adsorptive process. Results show that the adsorption of anti-IL8 mAb to m-APBA is enthalpically driven, corroborating the presence of the reversible esterification reaction between boronic acid or boronates and cis-diol-containing molecules. Nevertheless, for all mobile-phase modulators studied, changes in thermogram profiles are observed as well as reductions in the net heat of adsorption when increasing the pH. Overall, FMC and parallel chromatographic experiments data suggest that ligand salt tolerance could be enhanced using mobile-phase modulators, with all salts studied promoting the specific cis-diol interactions and reducing nonspecific interactions. The last feature is more noticeable at pH values above ligand's pK a , mainly due to the ability of NaF and (NH 4 ) 2 SO 4 to diminish electrostatic interactions when compared to the commonly used NaCl.
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Affiliation(s)
- Sara A S L Rosa
- Department of Bioengineering, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001, Lisboa, Portugal
| | - Alexandra Wagner
- Department of Bioengineering, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001, Lisboa, Portugal
| | - Cláudia L da Silva
- Department of Bioengineering, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001, Lisboa, Portugal.,The Discoveries Centre for Regenerative and Precision Medicine, Lisbon Campus, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001, Lisboa, Portugal
| | - Maria R Aires-Barros
- Department of Bioengineering, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001, Lisboa, Portugal
| | - Ana M Azevedo
- Department of Bioengineering, iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049-001, Lisboa, Portugal
| | - Ana C Dias-Cabral
- CICS-UBI-Health Sciences Research Centre, University of Beira Interior, Avenida Infante D. Henrique, 6200-506, Covilhã, Portugal.,Department of Chemistry, University of Beira Interior, Rua Marquês D'Ávila e Bolama, 6201-001, Covilhã, Portugal
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12
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Plewka J, Silva GL, Tscheließnig R, Rennhofer H, Dias‐Cabral C, Jungbauer A, Lichtenegger HC. Antibody adsorption in protein-A affinity chromatography - in situ measurement of nanoscale structure by small-angle X-ray scattering. J Sep Sci 2018; 41:4122-4132. [PMID: 30240534 PMCID: PMC6282589 DOI: 10.1002/jssc.201800776] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 09/14/2018] [Accepted: 09/14/2018] [Indexed: 02/02/2023]
Abstract
Protein-A chromatography is the most widely used chromatography step in downstream processing of antibodies. A deeper understanding of the influence of the surface topology on a molecular/nanoscale level on adsorption is essential for further improvement. It is not clear if the binding is homogenous throughout the entire bead network. We followed the protein absorption process and observed the formation of a protein layer on fibers of chromatography resin in a time-resolved manner in nanoscale. To characterize the changes in the antibody-protein-A ligand complex, small angle X-ray scattering was employed using a miniaturized X-ray-transparent chromatography column packed with a MabSelect SuRe resin. Antibody-free MabSelect SuRe resin fiber had an average radius of 12 nm and the protein layer thickness resulting from antibody adsorption was 5.5 and 10.4 nm for fiber and junctions, respectively under applied native conditions. We hypothesize that an average of 1.2 antibodies were adsorbed per protein-A ligand tetramer bound to the outermost units. In contrast to previous studies, it was therefore possible for the first time to directly correlate the nanostructure changes inside the column, which is otherwise a black box, with the adsorption and elution process.
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Affiliation(s)
- Jacek Plewka
- Department of Material Science and Process EngineeringUniversity of Natural Resources and LifeSciencesViennaAustria
- Austrian Centre of Industrial BiotechnologyViennaAustria
| | - Gonçalo L. Silva
- Austrian Centre of Industrial BiotechnologyViennaAustria
- CICS‐UBI – Health Sciences Research CentreUniversity of Beira Interior
CovilhãPortugal
- Department of ChemistryUniversity of Beira InteriorCovilhãPortugal
| | - Rupert Tscheließnig
- Department of BiotechnologyUniversity of Natural Resources and Life Sciences
ViennaAustria
- Austrian Centre of Industrial BiotechnologyViennaAustria
| | - Harald Rennhofer
- Department of Material Science and Process EngineeringUniversity of Natural Resources and LifeSciencesViennaAustria
| | - Cristina Dias‐Cabral
- CICS‐UBI – Health Sciences Research CentreUniversity of Beira Interior
CovilhãPortugal
- Department of ChemistryUniversity of Beira InteriorCovilhãPortugal
| | - Alois Jungbauer
- Department of BiotechnologyUniversity of Natural Resources and Life Sciences
ViennaAustria
- Austrian Centre of Industrial BiotechnologyViennaAustria
| | - Helga C. Lichtenegger
- Department of Material Science and Process EngineeringUniversity of Natural Resources and LifeSciencesViennaAustria
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