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A Novel Nanobody Precisely Visualizes Phosphorylated Histone H2AX in Living Cancer Cells under Drug-Induced Replication Stress. Cancers (Basel) 2021; 13:cancers13133317. [PMID: 34282773 PMCID: PMC8267817 DOI: 10.3390/cancers13133317] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/24/2021] [Accepted: 06/25/2021] [Indexed: 12/21/2022] Open
Abstract
Simple Summary γ-H2AX, a phosphorylated variant of histone H2A, is a widely used biomarker of DNA replication stress. To develop an immunological probe able to detect and track γ-H2AX in live cancer cells, we have isolated single domain antibodies (called nanobodies) that are easily expressed as functional recombinant proteins and here we report the extensive characterization of a novel nanobody that specifically recognizes γ-H2AX. The interaction of this nanobody with the C-terminal end of γ-H2AX was determined by X-ray crystallography. Moreover, the generation of a bivalent nanobody allowed us to precisely detect γ-H2AX foci in drug-treated cells as efficiently as with commercially available conventional antibodies. Furthermore, we tracked γ-H2AX foci in live cells upon intracellular delivery of the bivalent nanobody fused to the red fluorescent protein dTomato, making, consequently, this new cost-effective reagent useful for studying drug-induced replication stress in both fixed and living cancer cells. Abstract Histone H2AX phosphorylated at serine 139 (γ-H2AX) is a hallmark of DNA damage, signaling the presence of DNA double-strand breaks and global replication stress in mammalian cells. While γ-H2AX can be visualized with antibodies in fixed cells, its detection in living cells was so far not possible. Here, we used immune libraries and phage display to isolate nanobodies that specifically bind to γ-H2AX. We solved the crystal structure of the most soluble nanobody in complex with the phosphopeptide corresponding to the C-terminus of γ-H2AX and show the atomic constituents behind its specificity. We engineered a bivalent version of this nanobody and show that bivalency is essential to quantitatively visualize γ-H2AX in fixed drug-treated cells. After labelling with a chemical fluorophore, we were able to detect γ-H2AX in a single-step assay with the same sensitivity as with validated antibodies. Moreover, we produced fluorescent nanobody-dTomato fusion proteins and applied a transduction strategy to visualize with precision γ-H2AX foci present in intact living cells following drug treatment. Together, this novel tool allows performing fast screenings of genotoxic drugs and enables to study the dynamics of this particular chromatin modification in individual cancer cells under a variety of conditions.
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Zhong L, Shi W, Gan L, Liu X, Huo Y, Wu P, Zhang Z, Wu T, Peng H, Huang Y, Zhao Y, Yuan Y, Deng Z, Tang H. Human endoglin-CD3 bispecific T cell engager antibody induces anti-tumor effect in vivo. Am J Cancer Res 2021; 11:6393-6406. [PMID: 33995664 PMCID: PMC8120215 DOI: 10.7150/thno.53121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 03/12/2021] [Indexed: 12/11/2022] Open
Abstract
Rationale: Endoglin, also known as CD105, is a homo-dimeric membrane glycoprotein required for angiogenesis and serves as a marker for cancer vasculature. In this study, we constructed a bispecific T-cell engager (BiTE) antibody that targets human endoglin and CD3 (hEND-CD3/BiTE). We examined BiTE binding to endoglin-expressing cells and its effects on the cytolytic activity of T cells and cancer development. Methods: The in vitro effects of hEND-CD3/BiTE, including binding to target cells, T-cell activation, proliferation, and cytotoxicity, were examined in endoglin-expressing 293T cells, human umbilical vascular endothelial cells, tumor-derived endothelial cells, and CD3+ T cells. An in vivo xenograft tumor model was established using A549 human lung cancer cells. The therapeutic efficacy of hEND-CD3/BiTE was assessed by monitoring tumor growth, angiogenesis, and mouse survival. Results: hEND-CD3/BiTE specifically bound to endoglin-expressing cells and CD3+ T cells in vitro and stimulated T-cell activation, proliferation, and Th1 cytokine secretion, and promoted T-cell-mediated cytolysis of endoglin-expressing cells. The hEND-CD3/BiTE in vivo caused minimal toxicity to major organs, reduced tumor neoangiogenesis, inhibited tumor growth, and significantly improved mouse survival. Conclusions: Our study demonstrated the therapeutic potential of hEND-CD3/BiTE and provided a novel approach to clinical cancer treatment.
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Ye Z, Zeng S, Xu P, Liu W, Wang S, Xia X, Su C, Guo M. The Strategy of Conditionally Replicating Adenovirus-Mediated PreS2 Mini-Antibody Expression Has Dual Effects of Inhibiting HBV Infection and Preventing Hepatocellular Carcinoma. Cancer Manag Res 2021; 13:1869-1876. [PMID: 33658851 PMCID: PMC7917352 DOI: 10.2147/cmar.s298331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/14/2021] [Indexed: 11/23/2022] Open
Abstract
Aim To investigate the inhibitory effect of hepatitis B virus (HBV) preS2 mini-antibody (mPreS2) against HBV infection, HBV-associated liver injury and HBV-associated hepatic carcinogenesis. Methods A recombinant adenovirus vector with the human survivin promoter and mPreS2 gene, Ad5SVP-mPreS2, was constructed. Fluorescence microscopy examination and TCID 50 analysis were utilized to determine the specific proliferation of recombinant adenovirus in liver cancer cells. Western blot analysis was used to determine the mPreS2 expression levels. Enzyme-linked immunosorbent assay (ELISA) was used to examine HBsAg levels to evaluate the inhibitory effect of mPreS2 against HBV infection. The protective effects on hepatic function and preventive effects against hepatic carcinogenesis of Ad5SVP-mPreS2 were studied in diethylnitrosamine (DEN)-treated HBV transgenic Imprinting Control Region mice. Results The recombinant adenovirus regulated by the human survivin promoter proliferated exclusively in liver cancer cells rather than normal liver cells. The expression levels of mPreS2 were increased in liver cancer cells compared with normal liver cells, and mPreS2 could be used to recognize liver cells from HBV transgenic mice. ELISA showed that HBsAg levels were decreased in the group treated with Ad5SVP-mPreS2. Ad5SVP-mPreS2 had a protective effect on hepatic function in a DEN-induced liver injury model because of lower serum levels of alanine transaminase and aspartate transaminase. Additionally, HBV transgenic mice treated with Ad5SVP-mPreS2 had fewer and smaller cancerous nodes after induction with DEN than untreated mice. Conclusion Conditionally replicating adenovirus-mediated mPreS2 expression inhibited HBV infection and had an inhibitory effect on liver injury and hepatocellular carcinogenesis in HBV transgenic mice.
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Affiliation(s)
- Ziheng Ye
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Su Zeng
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Peipei Xu
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Wenfei Liu
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Shoufei Wang
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Xiaotian Xia
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
| | - Changqing Su
- Laboratory of Viral and Gene Therapy, Eastern Hepatobiliary Surgical Hospital and Institute, The Second Military Medical University, Shanghai, People's Republic of China
| | - Minggao Guo
- Center of Thyroid and Parathyroid, Department of Thyroid, Parathyroid, Breast and Hernia Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, People's Republic of China
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De Genst E, Chirgadze DY, Klein FAC, Butler DC, Matak-Vinković D, Trottier Y, Huston JS, Messer A, Dobson CM. Structure of a single-chain Fv bound to the 17 N-terminal residues of huntingtin provides insights into pathogenic amyloid formation and suppression. J Mol Biol 2015; 427:2166-78. [PMID: 25861763 PMCID: PMC4451460 DOI: 10.1016/j.jmb.2015.03.021] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 03/17/2015] [Accepted: 03/30/2015] [Indexed: 10/25/2022]
Abstract
Huntington's disease is triggered by misfolding of fragments of mutant forms of the huntingtin protein (mHTT) with aberrant polyglutamine expansions. The C4 single-chain Fv antibody (scFv) binds to the first 17 residues of huntingtin [HTT(1-17)] and generates substantial protection against multiple phenotypic pathologies in situ and in vivo. We show in this paper that C4 scFv inhibits amyloid formation by exon1 fragments of huntingtin in vitro and elucidate the structural basis for this inhibition and protection by determining the crystal structure of the complex of C4 scFv and HTT(1-17). The peptide binds with residues 3-11 forming an amphipathic helix that makes contact with the antibody fragment in such a way that the hydrophobic face of this helix is shielded from the solvent. Residues 12-17 of the peptide are in an extended conformation and interact with the same region of another C4 scFv:HTT(1-17) complex in the asymmetric unit, resulting in a β-sheet interface within a dimeric C4 scFv:HTT(1-17) complex. The nature of this scFv-peptide complex was further explored in solution by high-resolution NMR and physicochemical analysis of species in solution. The results provide insights into the manner in which C4 scFv inhibits the aggregation of HTT, and hence into its therapeutic potential, and suggests a structural basis for the initial interactions that underlie the formation of disease-associated amyloid fibrils by HTT.
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Affiliation(s)
- Erwin De Genst
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
| | - Dimitri Y Chirgadze
- Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1GA, UK
| | - Fabrice A C Klein
- Translational Medicine and Neurogenetics Programme, Institute of Genetics and Molecular and Cellular Biology, 67404 Illkirch Cédex, France
| | - David C Butler
- Neural Stem Cell Institute, Regenerative Research Foundation, Rensselaer, NY 12144, USA; Department of Biomedical Sciences, University at Albany, Albany, NY 12208, USA
| | - Dijana Matak-Vinković
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Yvon Trottier
- Translational Medicine and Neurogenetics Programme, Institute of Genetics and Molecular and Cellular Biology, 67404 Illkirch Cédex, France
| | - James S Huston
- James S. Huston, The Antibody Society, Newton, MA 02462, USA
| | - Anne Messer
- Neural Stem Cell Institute, Regenerative Research Foundation, Rensselaer, NY 12144, USA; Department of Biomedical Sciences, University at Albany, Albany, NY 12208, USA
| | - Christopher M Dobson
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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Robin G, Sato Y, Desplancq D, Rochel N, Weiss E, Martineau P. Restricted Diversity of Antigen Binding Residues of Antibodies Revealed by Computational Alanine Scanning of 227 Antibody–Antigen Complexes. J Mol Biol 2014; 426:3729-3743. [DOI: 10.1016/j.jmb.2014.08.013] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/31/2014] [Accepted: 08/09/2014] [Indexed: 12/28/2022]
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Petrovskaya LE, Gapizov SS, Shingarova LN, Kryukova EA, Boldyreva EF, Yakimov SA, Svirschevskaya EV, Lukashev EP, Dolgikh DA, Kirpichnikov MP. Fluorescent fusion proteins derived from the tenth human fibronectin domain. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2014. [DOI: 10.1134/s1068162014030121] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Freund G, Desplancq D, Stoessel A, Weinsanto R, Sibler AP, Robin G, Martineau P, Didier P, Wagner J, Weiss E. Generation of an intrabody-based reagent suitable for imaging endogenous proliferating cell nuclear antigen in living cancer cells. J Mol Recognit 2014; 27:549-58. [DOI: 10.1002/jmr.2378] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 04/01/2014] [Accepted: 04/01/2014] [Indexed: 01/09/2023]
Affiliation(s)
- Guillaume Freund
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
| | - Dominique Desplancq
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
| | - Audrey Stoessel
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
| | - Robin Weinsanto
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
| | - Annie-Paule Sibler
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
| | - Gautier Robin
- Institut de Recherche en Cancérologie de Montpellier, U896; INSERM/Université Montpellier 1; Campus Val d'Aurelle Montpellier France
| | - Pierre Martineau
- Institut de Recherche en Cancérologie de Montpellier, U896; INSERM/Université Montpellier 1; Campus Val d'Aurelle Montpellier France
| | - Pascal Didier
- Faculté de Pharmacie, UMR 7213; CNRS/Université de Strasbourg; Route du Rhin Illkirch France
| | - Jérôme Wagner
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
| | - Etienne Weiss
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242; CNRS/Université de Strasbourg; Boulevard Sébastien Brant Illkirch France
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ZHANG ZHONGLIN, ZHANG JIFA, YUAN YUFENG, HE YUEMING, LIU QUANYAN, MAO XIAOWEN, AI YONGBIAO, LIU ZHISU. Suppression of angiogenesis and tumor growth in vitro and in vivo using an anti-angiopoietin-2 single-chain antibody. Exp Ther Med 2014; 7:543-552. [PMID: 24520243 PMCID: PMC3919851 DOI: 10.3892/etm.2014.1476] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 12/11/2013] [Indexed: 12/15/2022] Open
Abstract
Hepatocellular carcinomas (HCCs) are tumors with a highly developed vascular architecture. HCC cells require access to blood vessels for growth and metastasis; therefore, the inhibition of angiogenesis represents a potential therapeutic target for HCC that may reduce the mortality and morbidity from HCC. Various attempts to develop an anti-angiogenic therapy have been made in past decades; however, modest results have been achieved in clinical trials and the challenge of HCC treatment remains. Single-chain antibodies (scFv) are characterized by low molecular weight, low immunogenicity, high penetration and a short half-life, and are easy to produce on a large scale by genetic engineering. Accordingly, an scFv against a specific angiogenic regulator, such as angiopoietin (Ang), may be a promising anti-angiogenic therapy for HCC. Our previous study indicated that an imbalanced expression of angiopoietin-2 (Ang-2) vs. angiopoietin-1 (Ang-1) in HCCs contributes to initiation of neovascularization and promotes the angiogenesis and progression of HCCs. Therefore, we suggest that specific Ang-2-targeting interventions may be valuable in the treatment of HCC via remodeling the neovascular network and changing the tumor microenvironment. In this study, a prokaryotic expression vector of Ang-2 was constructed and purified human Ang-2 protein was isolated. An scFv against human Ang-2 (scFv-Ang2) was identified and purified via phage display technology, and the effects of scFv-Ang2 in vitro and in vivo on HCC in nude mice were evaluated. The results show that scFv-Ang2 inhibits vascular endothelial growth factor (VEGF) and Ang-2 induces the proliferation, migration and tubule formation of human umbilical vein endothelial cells (HUVECs) in vitro. In the in vivo assay, statistical indices, including tumor weight and volume, metastases to lungs, CD31 expression and the microvessel density (MVD) count in the scFv-Ang2-treated group of mice were significantly lower than those in the control group (P<0.05). In conclusion, the successfully generated scFv-Ang2 showed significant inhibitory effects on the angiogenesis and tumor growth of human HCC in vitro and in vivo.
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Affiliation(s)
- ZHONG-LIN ZHANG
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - JI-FA ZHANG
- Department of General Surgery, Branch Hospital in Fengxian of Shanghai No. 6 People’s Hospital, Shanghai 201406, P.R. China
| | - YU-FENG YUAN
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - YUE-MING HE
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - QUAN-YAN LIU
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - XIAO-WEN MAO
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - YONG-BIAO AI
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - ZHI-SU LIU
- Hepatobiliary & Pancreatic Unit, Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
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Rinaldi AS, Freund G, Desplancq D, Sibler AP, Baltzinger M, Rochel N, Mély Y, Didier P, Weiss E. The use of fluorescent intrabodies to detect endogenous gankyrin in living cancer cells. Exp Cell Res 2013; 319:838-49. [PMID: 23353833 DOI: 10.1016/j.yexcr.2013.01.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/07/2012] [Accepted: 01/10/2013] [Indexed: 01/31/2023]
Abstract
Expression of antibody fragments in mammalian cells (intrabodies) is used to probe the target protein or interfere with its biological function. We previously described the in vitro characterisation of a single-chain Fv (scFv) antibody fragment (F5) isolated from an intrabody library that binds to the oncoprotein gankyrin (GK) in solution. Here, we have isolated several other scFvs that interact with GK in the presence of F5 and tested whether they allow, when fused to fluorescent proteins, to detect by FRET endogenous GK in living cells. The binding of pairs of scFvs to GK was analysed by gel filtration and the ability of each scFv to mediate nuclear import/export of GK was determined. Binding between scFv-EGFP and RFP-labelled GK in living cells was detected by fluorescence lifetime imaging microscopy (FLIM). After co-transfection of two scFvs fused to EGFP and RFP, respectively, which form a tri-molecular complex with GK in vitro, FRET signal was measured. This system allowed us to observe that GK is monomeric and distributed throughout the cytoplasm and nucleus of several cancer cell lines. Our results show that pairs of fluorescently labelled intrabodies can be monitored by FLIM-FRET microscopy and that this technique allows the detection of lowly expressed endogenous proteins in single living cells.
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Affiliation(s)
- Anne-Sophie Rinaldi
- Ecole Supérieure de Biotechnologie de Strasbourg, UMR 7242, CNRS/Université de Strasbourg, boulevard Sébastien Brant, 67412 Illkirch, France
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Guglielmi L, Denis V, Vezzio-Vié N, Bec N, Dariavach P, Larroque C, Martineau P. Selection for intrabody solubility in mammalian cells using GFP fusions. Protein Eng Des Sel 2011; 24:873-81. [PMID: 21997307 DOI: 10.1093/protein/gzr049] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Single-chain antibody fragments (scFv) expressed in the cytoplasm of mammalian cells, also called intrabodies, have many applications in functional proteomics. These applications are, however, limited by the aggregation-prone behaviour of many intrabodies. We show here that two scFv with highly homologous sequences and comparable soluble expression levels in Escherichia coli cytoplasm have different behaviours in mammalian cells. When over-expressed, one of the scFv aggregates in the cytoplasm whereas the second one is soluble and active. When expressed at low levels, using a retroviral vector, as a fusion with the green fluorescent protein (GFP) the former does not form aggregates and is degraded, resulting in weakly fluorescent cells, whereas the latter is expressed as a soluble protein, resulting in strongly fluorescent cells. These data suggest that the GFP signal can be used to evaluate the soluble expression of intrabodies in mammalian cells. When applied to a subset of an E.coli-optimised intrabody library, we showed that the population of GFP+ cells contains indeed soluble mammalian intrabodies. Altogether, our data demonstrate that the requirements for soluble intrabody expression are different in E.coli and mammalian cells, and that intrabody libraries can be directly optimised in human cells using a simple GFP-based assay.
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Affiliation(s)
- Laurence Guglielmi
- IRCM, Institut de Recherche en Cancérologie de Montpellier, Montpellier F-34298, France
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