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Huang X, Li W, Cao X, Zhang Q, Lin Y, Xu S, Dong X, Liu P, Liu Y, He G, Luo K, Feng S. Generation and characterization of a nanobody against the avian influenza virus H7 subtype. Int J Biol Macromol 2024; 267:131458. [PMID: 38593899 DOI: 10.1016/j.ijbiomac.2024.131458] [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: 01/17/2024] [Revised: 04/05/2024] [Accepted: 04/05/2024] [Indexed: 04/11/2024]
Abstract
Avian influenza virus (AIV) H7N9 diseases have been recently reported, raising concerns about a potential pandemic. Thus, there is an urgent need for effective therapeutics for AIV H7N9 infections. Herein, camelid immunization and yeast two-hybrid techniques were used to identify potent neutralizing nanobodies (Nbs) targeting the H7 subtype hemagglutinin. First, we evaluated the binding specificity and hemagglutination inhibition activity of the screened Nbs against the H7 subtype hemagglutinin. Nb-Z77, with high hemagglutination inhibition activity was selected from the screened Nbs to optimize the yeast expression conditions and construct oligomeric forms of Nb-Z77 using various ligation methods. The oligomers Nb-Z77-DiGS, Nb-Z77-TriGS, Nb-Z77-Fc and Nb-Z77-Foldon were successfully constructed and expressed. Nb-Z77-DiGS and Nb-Z77-Foldon exhibited considerably greater activity than did Nb-Z77 against H7 subtype hemagglutinin, with median effective concentrations of 384.7 and 27.33 pM and binding affinity values of 213 and 5.21 pM, respectively. Nb-Z77-DiGS and Nb-Z77-Foldon completely inhibited the hemagglutination activity of the inactivated virus H7-Re1 at the lowest concentration of 0.938 μg/mL. This study screened a strain of Nb with high hemagglutination inhibition activity and enhanced its antiviral activity through oligomerization, which may have great potential for developing effective agents for the prevention, diagnosis, and treatment of AIV H7 subtype infection.
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Affiliation(s)
- Xiuqin Huang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Weiye Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xuewei Cao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Qi Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yizhen Lin
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Siqi Xu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xinying Dong
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Peiqi Liu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Yutong Liu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ge He
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Kaijian Luo
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.
| | - Saixiang Feng
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.
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Xu C, He D, Zu Y, Hong S, Hao J, Li J. Microcystin-LR heterologous genetically engineered antibody recombinant and its binding activity improvement and application in immunoassay. JOURNAL OF HAZARDOUS MATERIALS 2021; 406:124596. [PMID: 33307449 DOI: 10.1016/j.jhazmat.2020.124596] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/12/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
Microcystin-LR (MC-LR) is a high-toxic biohazard that pollutes ecological environment and agroproducts. In this study, a newly recombined genetically engineered antibody (AVHH-MVH) with higher thermal stability and binding activity was designed by chain shuffling and based on our previously obtained anti-MC-LR scFv and nanobody. Based on AVHH-MVH template, a capacity of 8.99 × 105 CFU/mL of phage display AVHH-MVH mutagenesis library was constructed by site-directed mutagenesis in MVH-CDR3 region, and then used for ultrasensitive mutants screening. Afterwards, a total of five positive AVHH-MVH mutants were isolated from the mutagenesis library, and their binding activity was higher than AVHH-MVH for MC-LR. The AVHH-MVH mutant 3 was cloned into pET-25b vector for soluble expression, and the concentration of target protein expressed in culture system was 43.5 mg/L. An indirect competitive enzyme-linked immunosorbent assay (IC-ELISA) was established based on purified AVHH-MVH mutant 3 protein, and it showed ultrasensitive binding activity for MC-LR with the detection limit of 0.0075 μg/L, which was far below the maximum residue limit standard of 1.0 μg/L in drinking water proposed by World Health Organization. The established IC-ELISA shows good accuracy, repeatability, stability and applicability for MC-LR spiked samples, and it is promising for MC-LR ultrasensitive monitoring.
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Affiliation(s)
- Chongxin Xu
- Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.
| | - Dan He
- Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Yao Zu
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Sujuan Hong
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Jia Hao
- Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; College of Plant Protection, Nanjing Agricultural University, Nanjing 210023, China
| | - Jianhong Li
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.
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Site-saturation mutagenesis library construction and screening for specific broad-spectrum single-domain antibodies against multiple Cry1 toxins. Appl Microbiol Biotechnol 2017; 101:6071-6082. [DOI: 10.1007/s00253-017-8347-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 05/08/2017] [Accepted: 05/10/2017] [Indexed: 10/19/2022]
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Zhou Y, Zhang J, Jin H, Chen Z, Wu Q, Li W, Yue M, Luo C, Wang M. Prokaryotic expression and refolding of EGFR extracellular domain and generation of phage display human scFv against EGFR. Biomed Pharmacother 2013; 67:737-43. [PMID: 23639232 DOI: 10.1016/j.biopha.2013.03.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Accepted: 03/24/2013] [Indexed: 10/26/2022] Open
Abstract
The epidermal growth factor receptor (EGFR), overexpressed in many epithelial tumors, is emerging as an attractive target for cancer therapy. Antibodies to the extracellular region of EGFR play a key role in the development of a mechanistic understanding and cancer therapy. In the present study, we demonstrated for the first time that EGFR-truncated extracellular domain (EGFR-tED), which was expressed in Escherichia coli BL21 (DE3) cells in the form of inclusion bodies, could be purified and renatured. The EGFR-tED protein was purified by gel filtration and Ni-NTA affinity chromatography with high purity (>90%) and refolded by a urea gradient size-exclusion chromatography, which could bind its ligand EGF in a concentration-dependent manner. The renatured EGFR was used for biopanning anti-EGFR scFvs from a human synthetic antibody phage display library. Combined with an additional cell-based ELISA screen, a novel scFv, E10, was obtained with two-fold more potent on the binding to EGFR-bearing tumor cells (the epidermoid carcinoma cell line A431) and the inhibition of A431 cells proliferation than scFv 11F8, suggesting that the E10 has the potential to be developed as therapeutic agents to solid tumors associated with EGFR overexpression.
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Affiliation(s)
- Yaqiong Zhou
- State Key Laboratory of Natural Medicines (China Pharmaceutical University), School of Life Science & Technology, China Pharmaceutical University, Nanjing 210009, PR China
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Bae KB, Jeong YJ, Won HJ, Hong KH, Choi IW, Seo SK, Park SG. A human monoclonal antibody scFv to urokinase plasminogen activator. Hybridoma (Larchmt) 2010; 29:147-52. [PMID: 20443707 DOI: 10.1089/hyb.2009.0086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A human monoclonal antibody can be a good method for tumor diagnosis and treatment. This study is aimed at the generation of human antibody fragments against urokinase plasminogen activator (uPA) known to be related to tumor metastasis using the naive human antibody phage display library. Three clones--A2, A8, and E4--were selected from 1 x 10(10) sized human naïve antibody phage library using BIAcore rescue and screen. Clone A8 was finally selected by flow cytometry against Hep3 and HT1080, uPA overexpressing tumor cell lines. A8 clone consisted of 324 bp lambda and 402 bp heavy chains. The affinity (K(D)) of purified A8 antibody fragments was 1.44 x 10(-8) M(-1). The antibody fragment was reacted with HT1080 in a dose-dependent manner but not reacted with LS513 normal fibroblast. In this study, uPA specific human monoclonal antibody fragment A8 was made with BIAcore selection. Selected A8 was bound specifically to uPA expressed on the tumor cell surface. Further study for the application of A8 antibody clones will be needed.
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Affiliation(s)
- Ki-Beom Bae
- Department of Surgery, Pusan Paik Hospital, Busan, Republic of Korea
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Abstract
Among the microorganisms that cause diseases of medical or veterinary importance, the only group that is entirely dependent on the host, and hence not easily amenable to therapy via pharmaceuticals, is the viruses. Since viruses are obligate intracellular pathogens, and therefore depend a great deal on cellular processes, direct therapy of viral infections is difficult. Thus, modifying or targeting nonspecific or specific immune responses is an important aspect of intervention of ongoing viral infections. However, as a result of the unavailability of effective vaccines and the extended duration of manifestation, chronic viral infections are the most suitable for immunotherapies. We present an overview of various immunological strategies that have been applied for treating viral infections after exposure to the infectious agent.
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Affiliation(s)
- Nagendra R Hegde
- Bharat Biotech Foundation, Genome Valley, Turkapally, Shameerpet Mandal, Hyderabad 500078, India.
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Pairwise decomposition of residue interaction energies of single chain Fv with HIV-1 p17 epitope variants. Mol Immunol 2009; 47:982-90. [PMID: 20022377 DOI: 10.1016/j.molimm.2009.11.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2009] [Revised: 11/07/2009] [Accepted: 11/13/2009] [Indexed: 11/23/2022]
Abstract
Computational assisted modeling was carried out to investigate the importance of specific residues in the binding site of scFv. In this study, scFv against HIV-1 epitope at the C-terminal on p17 (scFv anti-p17) was used as a candidate molecule for evaluating the method. The wild-type p17 and its nine natural mutants were docked with scFv anti-p17. Potential mean force (PMF) scores predicted the most favorable binding interaction, and the correlation agreed well with the corresponding activity data from the peptide based ELISA. In the interaction with solvent molecules, the 3D structures of scFv anti-p17 and selected peptide epitopes were further investigated by molecular dynamics (MDs) simulation with the AMBER 9 program. Post-processing of the snapshot at equilibrium was performed to evaluate the binding free energy and pairwise decomposition or residue-based energy calculation of complexes in solution using the Molecular Mechanics Poisson-Boltzmann Surface Area (MM-PBSA) protocol. Our results demonstrated that the specific residues located in the complementary determining regions (CDRs) of scFv anti-p17, MET100, LYS101, ASN169, HIS228, and LEU229, play a crucial role in the effective binding interaction with the absolute relative decomposed energy more than 2.00 kcal/mol in comparison to the original substrate.
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Ettayebi K, Hardy ME. Recombinant norovirus-specific scFv inhibit virus-like particle binding to cellular ligands. Virol J 2008; 5:21. [PMID: 18237416 PMCID: PMC2267775 DOI: 10.1186/1743-422x-5-21] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2007] [Accepted: 01/31/2008] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Noroviruses cause epidemic outbreaks of gastrointestinal illness in all age-groups. The rapid onset and ease of person-to-person transmission suggest that inhibitors of the initial steps of virus binding to susceptible cells have value in limiting spread and outbreak persistence. We previously generated a monoclonal antibody (mAb) 54.6 that blocks binding of recombinant norovirus-like particles (VLP) to Caco-2 intestinal cells and inhibits VLP-mediated hemagglutination. In this study, we engineered the antigen binding domains of mAb 54.6 into a single chain variable fragment (scFv) and tested whether these scFv could function as cell binding inhibitors, similar to the parent mAb. RESULTS The scFv54.6 construct was engineered to encode the light (VL) and heavy (VH) variable domains of mAb 54.6 separated by a flexible peptide linker, and this recombinant protein was expressed in Pichia pastoris. Purified scFv54.6 recognized native VLPs by immunoblot, inhibited VLP-mediated hemagglutination, and blocked VLP binding to H carbohydrate antigen expressed on the surface of a CHO cell line stably transfected to express alpha 1,2-fucosyltransferase. CONCLUSION scFv54.6 retained the functional properties of the parent mAb with respect to inhibiting norovirus particle interactions with cells. With further engineering into a form deliverable to the gut mucosa, norovirus neutralizing antibodies represent a prophylactic strategy that would be valuable in outbreak settings.
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Affiliation(s)
- Khalil Ettayebi
- Veterinary Molecular Biology, Montana State University, Bozeman, MT 59717, USA
| | - Michele E Hardy
- Veterinary Molecular Biology, Montana State University, Bozeman, MT 59717, USA
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Kim SH, Hwang SY, Lee YS, Choi IH, Park SG, Kho WG. Single-chain antibody fragment specific for Plasmodium vivax Duffy binding protein. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2007; 14:726-31. [PMID: 17460118 PMCID: PMC1951088 DOI: 10.1128/cvi.00456-06] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Phage display of single-chain variable fragment (scFv) antibodies is a powerful tool for selecting important, useful, and specific human antibodies. We constructed a library from three patients infected with Plasmodium vivax. Panning on recombinant PvRII enriched a population of scFvs that recognized region II of the P. vivax Duffy binding protein (DBP). Three clones of scFvs that reacted with PvRII were selected, and their biological functions were analyzed. These scFvs inhibited erythrocyte binding to DBP. Clone SFDBII92 had the greatest affinity (dissociation constant = 3.62 x 10(-8) M) and the greatest inhibition activity (50% inhibitory concentration approximately 2.9 microg/ml) to DBP. Thus, we demonstrated that human neutralizing antibody could be made from malaria patients using phage display and that these neutralizing scFvs should prove valuable for developing both passive and active immunization strategies based on DBP.
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Affiliation(s)
- So-Hee Kim
- Department of Malariology, Paik Institute for Clinical Research, College of Medicine, Inje University, 633-165 Gaegum-dong, Jin-gu, Busan 614-735, South Korea
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Rich RL, Myszka DG. Survey of the year 2006 commercial optical biosensor literature. J Mol Recognit 2007; 20:300-66. [DOI: 10.1002/jmr.862] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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