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Sun L, Chen Q, Lu H, Wang J, Zhao J, Li P. Electrodialysis with porous membrane for bioproduct separation: Technology, features, and progress. Food Res Int 2020; 137:109343. [DOI: 10.1016/j.foodres.2020.109343] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 05/15/2020] [Accepted: 05/18/2020] [Indexed: 11/26/2022]
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2
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Choi Y, Jeong S, Choi JM, Ndong C, Griswold KE, Bailey-Kellogg C, Kim HS. Computer-guided binding mode identification and affinity improvement of an LRR protein binder without structure determination. PLoS Comput Biol 2020; 16:e1008150. [PMID: 32866140 PMCID: PMC7485979 DOI: 10.1371/journal.pcbi.1008150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 09/11/2020] [Accepted: 07/14/2020] [Indexed: 12/24/2022] Open
Abstract
Precise binding mode identification and subsequent affinity improvement without structure determination remain a challenge in the development of therapeutic proteins. However, relevant experimental techniques are generally quite costly, and purely computational methods have been unreliable. Here, we show that integrated computational and experimental epitope localization followed by full-atom energy minimization can yield an accurate complex model structure which ultimately enables effective affinity improvement and redesign of binding specificity. As proof-of-concept, we used a leucine-rich repeat (LRR) protein binder, called a repebody (Rb), that specifically recognizes human IgG1 (hIgG1). We performed computationally-guided identification of the Rb:hIgG1 binding mode and leveraged the resulting model to reengineer the Rb so as to significantly increase its binding affinity for hIgG1 as well as redesign its specificity toward multiple IgGs from other species. Experimental structure determination verified that our Rb:hIgG1 model closely matched the co-crystal structure. Using a benchmark of other LRR protein complexes, we further demonstrated that the present approach may be broadly applicable to proteins undergoing relatively small conformational changes upon target binding.
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Affiliation(s)
- Yoonjoo Choi
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Sukyo Jeong
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Jung-Min Choi
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Christian Ndong
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, United States of America
| | - Karl E. Griswold
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, United States of America
- Norris Cotton Cancer Center at Dartmouth, Lebanon, New Hampshire, United States of America
- Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire, United States of America
| | - Chris Bailey-Kellogg
- Department of Computer Science, Dartmouth College, Hanover, New Hampshire, United States of America
| | - Hak-Sung Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Korea
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3
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Sidorin EV, Khomenko VA, Kim NY, Solov'eva TF. Chaperone and Immunoglobulin-Binding Activities of Skp Protein from Yersinia pseudotuberculosis. BIOCHEMISTRY (MOSCOW) 2020; 85:80-89. [PMID: 32079519 DOI: 10.1134/s0006297920010071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Here, we determined qualitative and quantitative characteristics of the chaperone and immunoglobulin-binding activities of recombinant Skp protein (rSkp) from Yersinia pseudotuberculosis using the methods of dynamic light scattering and surface plasmon resonance. Commercial human polyclonal IgG and Fc and Fab fragments of human IgG were used as substrate proteins. The activity of rSkp strongly depended on the medium pH. The most stable low-molecular-weight complexes with a hydrodynamic radius up to 10 nm were formed by rSkp and protein substrates at acidic pH values. Under these conditions, rSkp exhibited the lowest propensity to self-association and the highest affinity for human IgG and its Fc and Fab fragments, as well as prevented their aggregation most efficiently (i.e., demonstrated the maximal chaperone activity). As the medium pH increased, the affinity of rSkp for IgG and its fragments decreased; rSkp was not able to completely prevent the aggregation of protein substrates, but significantly slowed it down. The obtained information may be of practical interest, since the stability of therapeutic IgG preparations affects their safety and efficacy in medical applications.
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Affiliation(s)
- E V Sidorin
- Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia.
| | - V A Khomenko
- Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia
| | - N Yu Kim
- Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia
| | - T F Solov'eva
- Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia
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Nascimento A, Pinto IF, Chu V, Aires-Barros MR, Conde JP, Azevedo AM. Studies on the purification of antibody fragments. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.12.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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5
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Fitzgerald J, Leonard P, Darcy E, Sharma S, O'Kennedy R. Immunoaffinity Chromatography: Concepts and Applications. Methods Mol Biol 2017; 1485:27-51. [PMID: 27730547 DOI: 10.1007/978-1-4939-6412-3_3] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Antibody-based separation methods, such as immunoaffinity chromatography (IAC), are powerful purification and isolation techniques. Antibodies isolated using these techniques have proven highly efficient in applications ranging from clinical diagnostics to environmental monitoring. Immunoaffinity chromatography is an efficient antibody separation method which exploits the binding efficiency of a ligand to an antibody. Essential to the successful design of any IAC platform is the optimization of critical experimental parameters such as (a) the biological affinity pair, (b) the matrix support, (c) the immobilization coupling chemistry, and (d) the effective elution conditions. These elements and the practicalities of their use are discussed in detail in this review. At the core of all IAC platforms is the high affinity interactions between antibodies and their related ligands; hence, this review entails a brief introduction to the generation of antibodies for use in immunoaffinity chromatography and also provides specific examples of their potential applications.
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Affiliation(s)
- Jenny Fitzgerald
- School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Paul Leonard
- School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland.,Biomedical Diagnostics Institute, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Elaine Darcy
- School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Shikha Sharma
- Biomedical Diagnostics Institute, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - Richard O'Kennedy
- School of Biotechnology, Dublin City University, Glasnevin, Dublin 9, Ireland. .,Biomedical Diagnostics Institute, Dublin City University, Glasnevin, Dublin 9, Ireland.
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6
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Wu C, Wan W, Zhu J, Jin H, Zhao T, Li H. Induction of potent apoptosis by an anti-CD20 aptamer via the crosslink of membrane CD20 on non-Hodgkin's lymphoma cells. RSC Adv 2017. [DOI: 10.1039/c6ra27154e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An anti-CD20 DNA aptamer was successfully generated by cell-SELEX, the crosslink of which can induce potent apoptosis in target cells.
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Affiliation(s)
- Cong Wu
- Department of Laboratory Diagnosis/Thoracic Surgery
- Changhai Hospital Affiliated to the Second Military Medical University
- Shanghai
- P.R. China
| | - Wei Wan
- Department of Orthopedic Oncology
- Spine Tumor Center
- Changzheng Hospital Affiliated to the Second Military Medical University
- Shanghai
- P.R. China
| | - Ji Zhu
- Department of Laboratory Diagnosis/Thoracic Surgery
- Changhai Hospital Affiliated to the Second Military Medical University
- Shanghai
- P.R. China
| | - Hai Jin
- Department of Laboratory Diagnosis/Thoracic Surgery
- Changhai Hospital Affiliated to the Second Military Medical University
- Shanghai
- P.R. China
| | - Tiejun Zhao
- Department of Laboratory Diagnosis/Thoracic Surgery
- Changhai Hospital Affiliated to the Second Military Medical University
- Shanghai
- P.R. China
| | - Huafei Li
- Department of Laboratory Diagnosis/Thoracic Surgery
- Changhai Hospital Affiliated to the Second Military Medical University
- Shanghai
- P.R. China
- International Joint Cancer Institute
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Mourão CA, Carmignotto GP, Bueno SMA. Separation of human IgG fragments using copper, nickel, zinc, and cobalt chelated to CM-Asp-agarose by positive and negative chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1017-1018:163-173. [DOI: 10.1016/j.jchromb.2016.01.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 01/20/2016] [Accepted: 01/30/2016] [Indexed: 10/22/2022]
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8
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Preparation and evaluation of human-murine chimeric antibody against protective antigen of Bacillus anthracis. Int J Mol Sci 2014; 15:18496-507. [PMID: 25318053 PMCID: PMC4227228 DOI: 10.3390/ijms151018496] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 09/25/2014] [Accepted: 09/30/2014] [Indexed: 12/24/2022] Open
Abstract
The aim of this research is to develop a human/murine chimeric Fab antibody which neutralizes the anthrax toxin, protective antigen (PA). The chimeric Fab was constructed using variable regions of murine anti-PA monoclonal antibody in combination with constant regions of human IgG. The chimeric PA6-Fab was expressed in E. coli. BL21 and evaluated by ELISA and co-immunoprecipitation- mass spectra. The potency of PA6-Fab to neutralize LeTx was examined in J774A.1 cell viability in vitro and in Fisher 344 rats in vivo. The PA6-Fab did not have domain similarity corresponding to the current anti PA mAbs, but specifically bound to anthrax PA at an affinity of 1.76 nM, and was able to neutralize LeTx in vitro and protected 56.9% cells at 20 μg/mL against anthrax LeTx. One hundred μg PA6-Fab could neutralize 300 μg LeTx in vivo. The PA6-Fab has potential as a therapeutic mAb for treatment of anthrax.
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Jarocka U, Sawicka R, Góra-Sochacka A, Sirko A, Zagórski-Ostoja W, Radecki J, Radecka H. An immunosensor based on antibody binding fragments attached to gold nanoparticles for the detection of peptides derived from avian influenza hemagglutinin H5. SENSORS (BASEL, SWITZERLAND) 2014; 14:15714-28. [PMID: 25157550 PMCID: PMC4208141 DOI: 10.3390/s140915714] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 07/10/2014] [Accepted: 08/11/2014] [Indexed: 01/07/2023]
Abstract
This paper concerns the development of an immunosensor for detection of peptides derived from avian influenza hemagglutinin H5. Its preparation consists of successive gold electrode modification steps: (i) modification with 1,6-hexanedithiol and gold colloidal nanoparticles; (ii) immobilization of antibody-binding fragments (Fab') of anti-hemagglutinin H5 monoclonal antibodies Mab 6-9-1 via S-Au covalent bonds; and (iii) covering the remaining free space on the electrode surfaces with bovine serum albumin. The interactions between Fab' fragments and hemagglutinin (HA) variants have been explored with electrochemical impedance spectroscopy (EIS) in the presence of [Fe(CN)6](3-/4-) as an electroactive marker. The immunosensor was able to recognize three different His-tagged variants of recombinant hemagglutinin from H5N1 viruses: H1 subunit (17-340 residues) of A/swan/Poland/305-135V08/2006, the long HA (17-530 residues) A/Bar-headed Goose/Qinghai/12/2005 and H1 subunit (1-345 residues) of A/Vietnam/1194/2004. The strongest response has been observed for the long variant with detection limit of 2.2 pg/mL and dynamic range from 4.0 to 20.0 pg/mL.
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Affiliation(s)
- Urszula Jarocka
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland.
| | - Róża Sawicka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland.
| | - Anna Góra-Sochacka
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland.
| | - Agnieszka Sirko
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland.
| | - Włodzimierz Zagórski-Ostoja
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland.
| | - Jerzy Radecki
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland.
| | - Hanna Radecka
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland.
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da Silva LCA, Serracchiani MM, Miranda EA, Bueno SMA. Separation of human Fab fragments on negative mode Ni(II)-TREN-agarose chromatography. Process Biochem 2014. [DOI: 10.1016/j.procbio.2013.12.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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El Khoury G, Lowe CR. A biomimetic Protein G affinity adsorbent: an Ugi ligand for immunoglobulins and Fab fragments based on the third IgG-binding domain of Protein G. J Mol Recognit 2013; 26:190-200. [DOI: 10.1002/jmr.2265] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 01/19/2013] [Accepted: 01/20/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Graziella El Khoury
- Institute of Biotechnology, Department of Chemical Engineering and Biotechnology; University of Cambridge; Tennis Court Road; Cambridge; CB2 1QT; UK
| | - Christopher R. Lowe
- Institute of Biotechnology, Department of Chemical Engineering and Biotechnology; University of Cambridge; Tennis Court Road; Cambridge; CB2 1QT; UK
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Camper N, Byrne T, Burden RE, Lowry J, Gray B, Johnston JA, Migaud ME, Olwill SA, Buick RJ, Scott CJ. Stable expression and purification of a functional processed Fab' fragment from a single nascent polypeptide in CHO cells expressing the mCAT-1 retroviral receptor. J Immunol Methods 2011; 372:30-41. [PMID: 21782818 DOI: 10.1016/j.jim.2011.06.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 06/24/2011] [Accepted: 06/24/2011] [Indexed: 01/21/2023]
Abstract
Monoclonal antibodies and derivative formats such as Fab' fragments are used in a broad range of therapeutic, diagnostic and research applications. New systems and methodologies that can improve the production of these proteins are consequently of much interest. Here we present a novel approach for the rapid production of processed Fab' fragments in a CHO cell line that has been engineered to express the mouse cationic amino acid transporter receptor 1 (mCAT-1). This facilitated the introduction of the target antibody gene through retroviral transfection, rapidly producing stable expression. Using this system, we designed a single retroviral vector construct for the expression of a target Fab' fragment as a single polypeptide with a furin cleavage site and a FMDV 2A self-cleaving peptide introduced to bridge the light and truncated heavy chain regions. The introduction of these cleavage motifs ensured equimolar expression and processing of the heavy and light domains as exemplified by the production of an active chimeric Fab' fragment against the Fas receptor, routinely expressed in 1-2mg/L yield in spinner-flask cell cultures. These results demonstrate that this method could have application in the facile production of bioactive Fab' fragments.
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Affiliation(s)
- Nicolas Camper
- Centre for Infection and Immunity, School of Medicine, Dentistry and Biomedical Science, Queen's University of Belfast, 97 Lisburn Rd, Belfast BT9 7BL, Northern Ireland, United Kingdom
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Abstract
Antibody-based separation methods, such as immunoaffinity chromatography (IAC), are powerful purification and isolation techniques. Antibodies isolated using these techniques have proven highly efficient in applications ranging from clinical diagnostics to environmental monitoring. IAC is an efficient antibody separation method which exploits the binding efficiency of a ligand to an antibody. Essential to the successful design of any IAC platform is the optimisation of critical experimental parameters such as: (a) the biological affinity pair, (b) the matrix support, (c) the immobilisation coupling chemistry, and (d) the effective elution conditions. These elements and the practicalities of their use are discussed in detail in this review. At the core of all IAC platforms is the high-affinity interactions between antibodies and their related ligands; hence, this review entails a brief introduction to the generation of antibodies for use in IAC and also provides specific examples of their potential applications.
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Affiliation(s)
- Jenny Fitzgerald
- School of Biotechnology, Dublin City University, Dublin, Ireland
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15
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Immunosensor incorporating anti-His (C-term) IgG F(ab') fragments attached to gold nanorods for detection of His-tagged proteins in culture medium. SENSORS 2010; 10:5409-24. [PMID: 22219669 PMCID: PMC3247714 DOI: 10.3390/s100605409] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Revised: 05/13/2010] [Accepted: 05/20/2010] [Indexed: 11/17/2022]
Abstract
Immunosensors based on gold electrodes (electrochemical) or gold discs (optical) modified with 1,6-hexanedithiol, gold nanorods and Anti-His (C-term) monoclonal antibody F(ab’) fragment are described. The antigen detected by the sensing platform is a recombinant histidine-tagged silk proteinase inhibitor (rSPI2-His6). Electrochemical impedance spectroscopy (EIS) and surface plasmon resonance (SPR) techniques were used as methods for detection of the antigen. This approach allows to detect the antigen protein in concentration of 10 pg per mL (0.13 pM) of culture medium. The immunosensor shows good reproducibility due to covalent immobilization of F(ab’) fragments to gold nanorods layer.
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Li S, Tang Y. Accurate Determination of Internalization for Target Binding Antibody Using Papain Digestion and Flow Cytometry. Hybridoma (Larchmt) 2010; 29:133-9. [PMID: 20443705 DOI: 10.1089/hyb.2009.0071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Sisi Li
- Division of Hematology-Oncology, and Zhejiang Key Laboratory for Neonatal Disease, Children's Hospital of Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Yongmin Tang
- Division of Hematology-Oncology, and Zhejiang Key Laboratory for Neonatal Disease, Children's Hospital of Zhejiang University School of Medicine, Hangzhou, P.R. China
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Yu D, Ghosh R. Integrated fragmentation of human IgG and purification of Fab using a reactant adsorptive membrane bioreactor separator system. Biotechnol Bioeng 2009; 104:152-61. [DOI: 10.1002/bit.22362] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kasicka V. From micro to macro: conversion of capillary electrophoretic separations of biomolecules and bioparticles to preparative free-flow electrophoresis scale. Electrophoresis 2009; 30 Suppl 1:S40-52. [PMID: 19517515 DOI: 10.1002/elps.200900156] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
This invited contribution in the special issue of Electrophoresis published in celebration of the 30th Anniversary of this journal reflects the impact of our milestone paper [Prusík, Z., Kasicka, V., Mudra, P., Stepánek, J., Smékal, O., Hlavácek, J., Electrophoresis 1990, 11, 932-936] in the area of conversion of microscale analytical and micropreparative CE separations of biomolecules and bioparticles into (macro)preparative free-flow electrophoresis (FFE) scale on the basis of a correlation between CE and FFE methods. In addition to the survey of advances in the relatively narrow field of CE-FFE correlation and CE-FFE conversion, a comprehensive review of the recent developments of micropreparative CE and (macro)preparative FFE techniques is also presented and applications of these techniques to micro- and (macro)preparative separations and purifications of biomolecules and bioparticles are demonstrated. The review covers the period since the year of publication of the above paper, i.e. ca. the last 20 years.
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Affiliation(s)
- Václav Kasicka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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Catzel D, Chin DY, Stanton PG, Gray PP, Mahler SM. Fractionation of follicle stimulating hormone charge isoforms in their native form by preparative electrophoresis technology. J Biotechnol 2006; 122:73-85. [PMID: 16198015 DOI: 10.1016/j.jbiotec.2005.08.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2005] [Revised: 08/02/2005] [Accepted: 08/24/2005] [Indexed: 11/29/2022]
Abstract
Complex glycoprotein biopharmaceuticals, such as follicle stimulating hormone (FSH), erythropoietin and tissue plasminogen activator consist of a range of charge isoforms due to the extent of sialic acid capping of the glycoprotein glycans. Sialic acid occupies the terminal position on the oligosaccharide chain, masking the penultimate sugar residue, galactose from recognition and uptake by the hepatocyte asialoglycoprotein receptor. It is therefore well established that the more acidic charge isoforms of glycoprotein biopharmaceuticals have higher in vivo potencies than those of less acidic isoforms due to their longer serum half-life. Current strategies for manipulating glycoprotein charge isoform profile involve cell engineering or altering bioprocesss parameters to optimise expression of more acidic or basic isoforms, rather than downstream separation of isoforms. A method for the purification of a discrete range of bioactive recombinant human FSH (rhFSH) charge isoforms based on Gradiflowtrade mark preparative electrophoresis technology is described. Gradiflowtrade mark electrophoresis is scaleable, and incorporation into glycoprotein biopharmaceutical production bioprocesses as a potential final step facilitates the production of biopharmaceutical preparations of improved in vivo potency.
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Affiliation(s)
- Dallia Catzel
- Bioengineering Centre, School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, Australia
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