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Febrianti RA, Narulita E. In-silico analysis of recombinant protein vaccines based on the spike protein of Indonesian SARS-CoV-2 through a reverse vaccinology approach. J Taibah Univ Med Sci 2022; 17:467-478. [PMID: 35250426 PMCID: PMC8881762 DOI: 10.1016/j.jtumed.2022.02.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/04/2022] [Accepted: 02/09/2022] [Indexed: 01/23/2023] Open
Abstract
Objectives This study aimed to produce a recombinant protein vaccine candidate based on an epitope of spike protein from Indonesian SARS-CoV-2 to provide immunogenicity and protection against future infection. Methods A reverse vaccinology approach was used to identify potential vaccine candidates by screening the pathogen's genome through computational analyses. Results Epitope vaccine candidates with the amino acid sequence of FKNHTSPDV were selected. This peptide is hydrophilic, does not induce autoimmune and allergic reactions, is antigenic, is classified as a stable protein, and is predicted to be present in the cell membrane. The selected epitope sequences were inserted into the plasmid vector pcDNA3.1(+) N-GST (thrombin). Inclusion of additional features of the gene encoding glutathione-S transferase, which can increase antigen expression and solubility, and the genes encoding NSP 1-4 proteins, which are essential in replication, added value to the produced recombinant protein. Conclusion Recombinant protein vaccine candidates with the FKNHTSPDV epitope have parameters sufficient for production on a laboratory scale for further testing.
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Affiliation(s)
- Riska A. Febrianti
- Department of Biotechnology, Postgraduate Program, University of Jember, Indonesia
| | - Erlia Narulita
- Department of Biotechnology, Postgraduate Program, University of Jember, Indonesia
- Department of Biology Education, University of Jember, Indonesia
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2
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Transient expression of an scFvG8 antibody in plants and characterization of its effects on the virulence factor pthA of Xanthomonas citri subsp. citri. Transgenic Res 2022; 31:269-283. [PMID: 35237898 DOI: 10.1007/s11248-022-00301-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 02/11/2022] [Indexed: 10/18/2022]
Abstract
Citrus bacterial canker, caused by Xanthomonas citri subsp. citri (Xcc), is a major disease of citrus plants, causing a significant loss in the citrus industry. The pthA is a bacterial effector protein mediates protein-protein and protein-DNA interactions and modulates host transcription. Injection of pthA effector protein into the host cell induces the expression of the susceptibility gene CsLOB1 which is required for citrus canker disease development. In this study, we described in planta expression of a specific anti-pthA single-chain variable fragment (scFv) recombinant antibody, scFvG8, and assessed its function using molecular docking, immunoblotting, and indirect enzyme-linked immunosorbent assay (ELISA). Based on the results, homology-based molecular docking suggested that at least eight intermolecular hydrogen bonds are involved in pthA-scFvG8 interactions. Immunoblotting and indirect ELISA results reconfirmed specific binding of scFvG8 to pthA protein. Moreover, gene fragment encoding scFvG8 was cloned into plant expression vector and transiently expressed in leaves of Nicotiana tabacum cv. Samson by agroinfiltration method. Transient expression of scFvG8 (at the expected size of 35 kDa) in N. tabacum leaves was confirmed by western blotting. Also, immunoblotting and indirect ELISA showed that the plant-derived scFvG8 had similar activity to purified scFvG8 antibody in detecting pthA. Additionally, in scFvG8-expressing tobacco leaves challenged with Xcc, a reduction (for up to 70%) of hypersensitive response (HR) possibly via direct interaction with pthA, was observed in the necrotic leaf area compared to control plants infected with empty vector. The results obtained in this study confirm that scFvG8 can suppress the function of pthA effector protein within plant cells, thus the induction of stable expression of scFvG8 in lime trees can be considered as an appropriate approach to confer resistance to Xcc.
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3
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Extracellular production of an anti-HER2 single-chain variable antibody fragment in Escherichia coli. Process Biochem 2021. [DOI: 10.1016/j.procbio.2021.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Efficient development and expression of scFv recombinant proteins against PD-L1 surface domain and potency in cancer therapy. Cytotechnology 2019; 71:705-722. [PMID: 31098772 DOI: 10.1007/s10616-019-00316-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 04/29/2019] [Indexed: 12/25/2022] Open
Abstract
PD-L1 is a 40 kDa trans-membrane protein of B7 family and an important T cell regulator. Binding of PD-L1 and PD-1 inhibits proliferation and activation of T cell results cell exhaustion. This phenomenon can be reversed by blocking PD-L1/PD-1 interactions with single chain variables fragment (scFv) fusion proteins and by direct inhibition of tumor cells with drug conjugates. The human phage-displayed scFv library was utilized to generate scFv against the PD-L1 antigen by affinity bio-panning. The positive clones were selected by continuous transfection of bacterial cells and sequence analysis. The binding affinity and specificity of the scFv and antibody fragments were determined by using surface plasmon resonance biosensor, western blot analysis, and immunofluorescence assay. After three rounds of panning selection, about 30% of clones have a binding affinity with targeted PD-L1 antigen. Eight positive clones with accurate sequences were isolated and analyzed for binding affinity with PD-L1 antigen. Three of those with accurate sequences and binding affinity were selected for the recombinant formation and soluble expression by Escherichia coli host machinery. The highly positive recombinant clones with the exact orientation of FR and CDR domains were developed and can be used as a drug carrier tools in ADC formation or direct inhibition of immune checkpoint in cancer immunotherapy. The conjugate achieved its initial potency and need efficient improvement to enhance direct tumor suppression and bio-therapeutics strategies enrichment.
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Cao X, Yu H, Chen C, Wei J, Wang P. Expression and characterization of recombinant humanized anti-HER2 single-chain antibody in Pichia pastoris for targeted cancer therapy. Biotechnol Lett 2015; 37:1347-54. [DOI: 10.1007/s10529-015-1804-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Accepted: 02/23/2015] [Indexed: 10/23/2022]
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6
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Akbari V, Mir Mohammad Sadeghi H, Jafrian-Dehkordi A, Abedi D, Chou CP. Functional expression of a single-chain antibody fragment against human epidermal growth factor receptor 2 (HER2) in Escherichia coli. ACTA ACUST UNITED AC 2014; 41:947-56. [DOI: 10.1007/s10295-014-1437-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Accepted: 03/10/2014] [Indexed: 11/30/2022]
Abstract
Abstract
The human epidermal growth factor receptor (HER) family plays an important role in cell growth and signaling and alteration of its function has been demonstrated in many different kinds of cancer. Receptor dimerization is necessary for the HER signal transduction pathway and tyrosine kinase activity. Recently, several monoclonal antibodies have been developed to directly interfere with ligand–HER receptor binding and receptor dimerization. A single chain variable fragment (ScFv) is a valuable alternative to an intact antibody. This report describes the production and purification of an ScFv specific for domain II of the HER2 receptor in Escherichia coli BL21 (DE3) cytoplasm. The majority of expressed of anti-her2his-ScFv protein was produced as inclusion bodies. A Ni-NTA affinity column was used to purify the anti-her2his-ScFv protein. The molecular weight of anti-her2his-ScFv protein was estimated to be approximately 27 kDa, as confirmed by SDS-PAGE and Western blotting assay. The anti-her2his-ScFv showed near 95 % purity and reached a yield of approximately 29 mg/l in flask fermentation. The purified anti-her2his-ScFv showed its biological activity by binding to HER2 receptor on the surface of BT-474 cells. This ScFv may be a potential pharmaceutical candidate for targeting tumour cells overexpressing HER2 receptor.
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Affiliation(s)
- Vajihe Akbari
- grid.411036.1 000000011498685X Department of Pharmaceutical Biotechnology, Isfahan Pharmaceutical Research Center, Faculty of Pharmacy Isfahan University of Medical Sciences Hezar Jarib Avenue Isfahan Iran
| | - Hamid Mir Mohammad Sadeghi
- grid.411036.1 000000011498685X Department of Pharmaceutical Biotechnology, Isfahan Pharmaceutical Research Center, Faculty of Pharmacy Isfahan University of Medical Sciences Hezar Jarib Avenue Isfahan Iran
| | - Abbas Jafrian-Dehkordi
- grid.411036.1 000000011498685X Department of Pharmaceutical Biotechnology, Isfahan Pharmaceutical Research Center, Faculty of Pharmacy Isfahan University of Medical Sciences Hezar Jarib Avenue Isfahan Iran
| | - Daryoush Abedi
- grid.411036.1 000000011498685X Department of Pharmaceutical Biotechnology, Isfahan Pharmaceutical Research Center, Faculty of Pharmacy Isfahan University of Medical Sciences Hezar Jarib Avenue Isfahan Iran
| | - C Perry Chou
- grid.46078.3d 0000000086441405 Department of Chemical Engineering University of Waterloo 200 University Avenue N2L 3G1 Waterloo ON Canada
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7
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Drees JJ, Augustin LB, Mertensotto MJ, Schottel JL, Leonard AS, Saltzman DA. Soluble production of a biologically active single-chain antibody against murine PD-L1 in Escherichia coli. Protein Expr Purif 2014; 94:60-6. [DOI: 10.1016/j.pep.2013.10.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 10/29/2013] [Accepted: 10/31/2013] [Indexed: 10/26/2022]
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8
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Preparation and diagnostic use of a novel recombinant single-chain antibody against rabies virus glycoprotein. Appl Microbiol Biotechnol 2013; 98:1547-55. [DOI: 10.1007/s00253-013-5351-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 10/17/2013] [Accepted: 10/19/2013] [Indexed: 12/28/2022]
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9
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Lombardi A, Gianese G, Arcangeli C, Galeffi P, Sperandei M. Bacterial cytoplasm production of an EGFP-labeled single-chain Fv antibody specific for the HER2 human receptor. J Biomol Struct Dyn 2012; 29:425-39. [PMID: 22066531 DOI: 10.1080/07391102.2011.10507396] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The human epidermal growth factor receptor 2 (HER2) is the main diagnostic marker of breast and ovary cancers. Here, to obtain a rapid and sensitive immunodiagnostic tool a single-chain antibody (scFv800E6) specific for the HER2 was fused to the N-terminus of the enhanced green fluorescent protein (EGFP) by a flexible linker. The soluble production of the novel scFv800E6-EGFP protein in the cytoplasm of Escherichia coli was investigated at different induction temperatures (25, 30 and 37°C); the intrinsic fluorescent properties and the binding activity to HER2 positive tumour cells of the fusion protein were analysed. Western blotting and fluorescence analysis of SDS-PAGE revealed the presence of two scFv800E6-EGFP forms, with different mobility and optical properties, their ratio depending on the induction temperature. The fluorescent form maintained the optical fluorescence properties of EGFP and exhibited a binding activity to the HER2-expressing cells comparable to that of the non-fused scFv800E6. In addition, to provide an insight into the effect of the induction temperature on the molecular structure, the folding of the fusion protein was assessed at atomic level by performing molecular dynamics simulations of the homology-derived model of scFv800E6-EGFP at 300 K and 310 K. The comparison of the data collected at these two temperatures revealed that the higher temperature affects specific structural elements. To improve the production of the soluble and functional scFv800E6-EGFP protein, "in silico" results could be utilised for ad hoc design of the molecular structure.
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Affiliation(s)
- Alessio Lombardi
- Institute of Biology and Agrarian Biotechnology (IBBA), National Research Council, via Bassini 15, 20133 Milan, Italy
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10
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Zakri AM, Ziegler A, Commandeur U, Fischer R, Torrance L. In vivo expression and binding activity of scFv-RWAV, which recognizes the coat protein of tomato leaf curl New Delhi virus (family Geminiviridae). Arch Virol 2012; 157:1291-9. [PMID: 22491815 DOI: 10.1007/s00705-012-1310-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2012] [Accepted: 03/15/2012] [Indexed: 11/26/2022]
Abstract
Recombinant antibodies expressed in plants have the potential to interrupt virus infections by blocking essential stages of the infection cycle. Here, we show that the expression of a recombinant single-chain variable fragment (scFv) that recognizes the coat protein of tomato leaf curl New Delhi virus (ToLCNDV) in vitro can also bind to a recombinant coat protein in vivo in the reducing environment of the plant cytosol. The scFv and its target were both expressed as fluorescent protein fusions, one incorporating green fluorescent protein (GFP) and the other DsRed. We found that the incorporation of a nuclear localization signal into the scFv construct resulted in the nuclear import of the antibody-antigen complex, as shown by colocalization of the two fluorescent signals. This demonstrates that recombinant antibodies can be targeted to the nucleus and will bind to geminivirus coat proteins therein, allowing the virus infection cycle to be interrupted during its critical replicative phase.
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Affiliation(s)
- Adel M Zakri
- Institute for Molecular Biotechnology (Biology VII), RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany.
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11
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Highly efficient production of anti-HER2 scFv antibody variant for targeting breast cancer cells. Appl Microbiol Biotechnol 2011; 91:613-21. [DOI: 10.1007/s00253-011-3306-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 04/01/2011] [Accepted: 04/02/2011] [Indexed: 10/18/2022]
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12
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Uil TG, de Vrij J, Vellinga J, Rabelink MJWE, Cramer SJ, Chan OYA, Pugnali M, Magnusson M, Lindholm L, Boulanger P, Hoeben RC. A lentiviral vector-based adenovirus fiber-pseudotyping approach for expedited functional assessment of candidate retargeted fibers. J Gene Med 2010; 11:990-1004. [PMID: 19757488 DOI: 10.1002/jgm.1395] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Many studies aimed at retargeting adenovirus (Ad) rationally focus on genetic modification of fiber, which is the primary receptor-binding protein of Ad. Retargeted fibers ultimately require functional validation in the viral context. METHODS Lentiviral vectors (LV) were used to express fiber variants in cells. Infections with a fiber gene-deleted Ad vector yielded fiber-pseudotyped viruses. An enzyme-linked immunosorbent assay and slot blot-based assays probed target binding-ability of retargeted fibers. Differential treatments with an alkylating agent prior to western blot analysis allowed for examination of intra- and extracellular redox states of fibers. RESULTS In the present study, LV-based fiber-pseudotyping of Ad is presented as an accelerated means to test new fibers. LV-mediated gene transfer yielded stable and uniform populations of fiber variant-expressing cells. These populations were found to effectively support fiber-pseudotyping of Ad. As a secondary objective of the study, we functionally assessed a chimeric fiber harboring a tumor antigen-directed single-chain antibody fragment (scFv). This fiber was shown to trimerize and achieve a degree of binding to its antigenic target. However, its capsid incorporation ability was impaired and, moreover, it was unable to confer a detectable level of target binding upon Ad. Importantly, subsequent analyses of this fiber revealed the improper folding of its scFv constituent. CONCLUSIONS LV-based fiber-pseudotyping was established as a convenient method for testing modified fibers for functionality within Ad particles. Furthermore, a new chimeric fiber was found to be inadequate for Ad retargeting. The folding difficulties encountered for this particular fiber might be generally inherent to the use (i.e. for genetic Ad capsid incorporation) of complex, disulfide bridge-containing natural ligands.
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Affiliation(s)
- Taco G Uil
- Leiden University Medical Center, Department of Molecular Cell Biology, Leiden, The Netherlands
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13
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Safarnejad MR, Fischer R, Commandeur U. Recombinant-antibody-mediated resistance against Tomato yellow leaf curl virus in Nicotiana benthamiana. Arch Virol 2009; 154:457-67. [PMID: 19234665 DOI: 10.1007/s00705-009-0330-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2008] [Accepted: 01/19/2009] [Indexed: 10/21/2022]
Abstract
Tomato yellow leaf curl virus (TYLCV) is a geminivirus species whose members cause severe crop losses in the tropics and subtropics. We report the expression of a single-chain variable fragment (scFv) antibody that protected Nicotiana benthamiana plants from a prevalent Iranian isolate of the virus (TYLCV-Ir). Two recombinant antibodies (scFv-ScRep1 and scFv-ScRep2) interacting with the multifunctional replication initiator protein (Rep) were obtained from phage display libraries and expressed in plants, both as stand-alone proteins and as N-terminal GFP fusions. Initial results indicated that both scFvs and both fusions accumulated to a detectable level in the cytosol and nucleus of plant cells. Transgenic plants challenged with TYLCV-Ir showed that the scFv-ScRep1, but more so the fusion proteins, were able to suppress TYLCV-Ir replication. These results show that expression of a scFv-ScRep1-GFP fusion protein can attenuate viral DNA replication and prevent the development of disease symptoms. The present article describes the first successful application of a recombinant antibody-mediated resistance approach against a plant DNA virus.
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Affiliation(s)
- Mohammad Reza Safarnejad
- Institute of Molecular Biotechnology (Biology VII), RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany.
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14
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Arcangeli C, Cantale C, Galeffi P, Gianese G, Paparcone R, Rosato V. Understanding structural/functional properties of immunoconjugates for cancer therapy by computational approaches. J Biomol Struct Dyn 2008; 26:35-48. [PMID: 18533724 DOI: 10.1080/07391102.2008.10507221] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Monoclonal antibodies coupled to highly toxic molecules (immunoconjugates) are currently being developed for cancer therapy. We have used an in silico procedure for evaluating some physicochemical properties of two tumor-targeting anti-HER2 immunoconjugates: (a) the single-chain antibody scFv(FRP5) linked to a bacterial toxin, that has been recently progressed to phase I clinical trial in human cancer; (b) the putative molecule formed by the intrinsically stable scFv(800E6), which has been proposed as toxin carrier to cancer cells in human therapy, joined to the same toxin of (a). Structural models of the immunoconjugates have been built by homology modeling and assessed by molecular dynamics simulations. The trajectories have been analyzed to extract some biochemical properties and to assess the potential effects of the toxin on the structure and dynamics of the anti-HER2 antibodies. The results of the computational approach indicate that the antibodies maintain their correct folding even in presence of the toxin, whereas a certain stiffness in correspondence of some structural regions is observed. Furthermore, the toxin does not seem to affect the antibody solubility, whereas it enhances the structural stability. The proposed computational approach represent a promising tool for analyzing some physicochemical properties of immunoconjugates and for predicting the effects of the linked toxin on structure, dynamics, and functionality of the antibodies.
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Affiliation(s)
- C Arcangeli
- Computing and Modeling Unit, ENEA Casaccia Research Center, Via Anguillarese 301, 00123 S.Maria di Galeria, Italy.
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15
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Vellinga J, De Vrij J, Myhre S, Uil T, Martineau P, Lindholm L, Hoeben RC. Efficient incorporation of a functional hyper-stable single-chain antibody fragment protein-IX fusion in the adenovirus capsid. Gene Ther 2007; 14:664-70. [PMID: 17268536 PMCID: PMC2233715 DOI: 10.1038/sj.gt.3302908] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Revised: 12/03/2006] [Accepted: 12/03/2006] [Indexed: 11/08/2022]
Abstract
Recombinant adenoviruses are frequently used as gene transfer vehicles for therapeutic gene delivery. Strategies to amend their tropism include the incorporation of polypeptides with high affinity for cellular receptors. Single-chain antibodies have a great potential to achieve such cell type specificity. In this study, we evaluated the efficiency of incorporation of a single-chain antibody fused with the adenovirus minor capsid protein IX in the capsid of adenovirus type 5 vectors. To this end, the codons for the single-chain antibody fragments (scFv) 13R4 were fused with those encoding of pIX via a 75-Angstrom spacer sequence. The 13R4 is a hyper-stable single-chain antibody directed against beta-galactosidase, which was selected for its capacity to fold correctly in a reducing environment such as the cytoplasm. A lentiviral vector was used to stably express the pIX.flag.75.13R4.MYC.HIS fusion gene in 911 helper cells. Upon propagation of pIX-gene deleted human adenovirus-5 vectors on these cells, the pIX-fusion protein was efficiently incorporated in the capsid. Here, the 13R4 scFv was functional as was evident from its capacity to bind its ligand beta-galactosidase. These data demonstrate that the minor capsid protein IX can be used as an anchor for incorporation of single-chain antibodies in the capsids of adenovirus vectors.
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Affiliation(s)
- Jort Vellinga
- Department of Molecular Cell Biology,
Leiden University Medical CenterDepartment of Molecular Cell Biology, Leiden University Medical Center, Einthovenweg
20, 2300 RC Leiden,The Netherlands,FR
| | - Jeroen De Vrij
- Department of Molecular Cell Biology,
Leiden University Medical CenterDepartment of Molecular Cell Biology, Leiden University Medical Center, Einthovenweg
20, 2300 RC Leiden,The Netherlands,FR
| | | | - Taco Uil
- Department of Molecular Cell Biology,
Leiden University Medical CenterDepartment of Molecular Cell Biology, Leiden University Medical Center, Einthovenweg
20, 2300 RC Leiden,The Netherlands,FR
| | - Pierre Martineau
- CPBS, Centre de pharmacologie et biotechnologies pour la santé
CNRS : UMR5160BIO-RADUniversité Montpellier IUniversité Montpellier II - Sciences et Techniques du LanguedocFaculté de Pharmacie - bat. I
15 Av Charles Flahault - BP 14491
34093 MONTPELLIER CEDEX 5,FR
| | | | - Rob C. Hoeben
- Department of Molecular Cell Biology,
Leiden University Medical CenterDepartment of Molecular Cell Biology, Leiden University Medical Center, Einthovenweg
20, 2300 RC Leiden,The Netherlands,FR
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16
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Galeffi P, Lombardi A, Pietraforte I, Novelli F, Di Donato M, Sperandei M, Tornambé A, Fraioli R, Martayan A, Natali PG, Benevolo M, Mottolese M, Ylera F, Cantale C, Giacomini P. Functional expression of a single-chain antibody to ErbB-2 in plants and cell-free systems. J Transl Med 2006; 4:39. [PMID: 17010186 PMCID: PMC1592514 DOI: 10.1186/1479-5876-4-39] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2006] [Accepted: 09/29/2006] [Indexed: 12/03/2022] Open
Abstract
Background Aberrant signaling by ErbB-2 (HER 2, Neu), a member of the human Epidermal Growth Factor (EGF) receptor family, is associated with an aggressive clinical behaviour of carcinomas, particularly breast tumors. Antibodies targeting the ErbB-2 pathway are a preferred therapeutic option for patients with advanced breast cancer, but a worldwide deficit in the manufacturing capacities of mammalian cell bioreactors is foreseen. Methods Herein, we describe a multi-platform approach for the production of recombinant Single chain Fragments of antibody variable regions (ScFvs) to ErbB-2 that involves their functional expression in (a) bacteria, (b) transient as well as stable transgenic tobacco plants, and (c) a newly developed cell-free transcription-translation system. Results An ScFv (ScFv800E6) was selected by cloning immunoglobulin sequences from murine hybridomas, and was expressed and fully functional in all the expression platforms, thereby representing the first ScFv to ErbB-2 produced in hosts other than bacteria and yeast. ScFv800E6 was optimized with respect to redox synthesis conditions. Different tags were introduced flanking the ScFv800E6 backbone, with and without spacer arms, including a novel Strep II tag that outperforms conventional streptavidin-based detection systems. ScFv800E6 was resistant to standard chemical radiolabeling procedures (i.e. Chloramine T), displayed a binding ability extremely similar to that of the parental monovalent Fab' fragment, as well as a flow cytometry performance and an equilibrium binding affinity (Ka approximately 2 × 108 M-1) only slightly lower than those of the parental bivalent antibody, suggesting that its binding site is conserved as compared to that of the parental antibody molecule. ScFv800E6 was found to be compatible with routine reagents for immunohistochemical staining. Conclusion ScFv800E6 is a useful reagent for in vitro biochemical and immunodiagnostic applications in oncology, and a candidate for future in vivo studies.
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Affiliation(s)
- Patrizia Galeffi
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Alessio Lombardi
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Immacolata Pietraforte
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
- Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Rome, Italy
| | - Flavia Novelli
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Monica Di Donato
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Maria Sperandei
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Andrea Tornambé
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Rocco Fraioli
- Laboratory of Immunology, Regina Elena Cancer Institute CRS, Via delle Messi d'Oro 156, 00158 Rome, Italy
| | - Aline Martayan
- Laboratory of Immunology, Regina Elena Cancer Institute CRS, Via delle Messi d'Oro 156, 00158 Rome, Italy
| | - Pier Giorgio Natali
- Laboratory of Immunology, Regina Elena Cancer Institute CRS, Via delle Messi d'Oro 156, 00158 Rome, Italy
| | - Maria Benevolo
- Laboratory of Pathology, Regina Elena Cancer Institute, Istituti Fisioterapici Ospitalieri, Via E. Chianesi 53, 00144 Rome, Italy
| | - Marcella Mottolese
- Laboratory of Pathology, Regina Elena Cancer Institute, Istituti Fisioterapici Ospitalieri, Via E. Chianesi 53, 00144 Rome, Italy
| | - Francisco Ylera
- Roche Diagnostics GmbH, Nonnenwald 2, D-82372 Penzberg, Germany
| | - Cristina Cantale
- ENEA BIOTEC-GEN, CR Casaccia Via Anguillarese 301, 00060 Rome, Italy
| | - Patrizio Giacomini
- Laboratory of Immunology, Regina Elena Cancer Institute CRS, Via delle Messi d'Oro 156, 00158 Rome, Italy
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17
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Leopoldino AM, Canduri F, Cabral H, Junqueira M, de Marqui ABT, Apponi LH, da Fonseca IO, Domont GB, Santos DS, Valentini S, Bonilla-Rodriguez GO, Fossey MA, de Azevedo WF, Tajara EH. Expression, purification, and circular dichroism analysis of human CDK9. Protein Expr Purif 2006; 47:614-20. [PMID: 16580843 DOI: 10.1016/j.pep.2006.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2005] [Revised: 02/02/2006] [Accepted: 02/14/2006] [Indexed: 11/29/2022]
Abstract
The human cyclin-dependent kinase 9 (CDK9) protein was expressed in E. coli BL21 using the pET23a vector at 30 degrees C. Several milligrams of protein were purified from soluble fraction using ionic exchange and ATP-affinity chromatography. The structural quality of recombinant CDK9 and the estimation of its secondary structure were obtained by circular dichroism. Structural models of CDK9 presented 26% of helices in agreement with the spectra by circular dichroism analysis. This is the first report on human CDK9 expression in Escherichia coli and structure analysis and provides the first step for the development of CDK9 inhibitors.
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