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Kumarasamy J, Ghorui SK, Gholve C, Jain B, Dhekale Y, Gupta GD, Damle A, Banerjee S, Rajan MGR, Kulkarni S. Production, characterization and in-vitro applications of single-domain antibody against thyroglobulin selected from novel T7 phage display library. J Immunol Methods 2021; 492:112990. [PMID: 33561431 DOI: 10.1016/j.jim.2021.112990] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 12/12/2022]
Abstract
Single- domain antibodies (SdAbs) have been deployed in various biomedical applications in the recent past. However, there are no reports of their use in the immunoradiometric assays (IRMA) for thyroglobulin (Tg). Tg is the precursor molecule for the biosynthesis of thyroid hormones: thyroxine and triiodothyronine, which are essential for the regulation of normal metabolism in all vertebrates. Patients with differentiated thyroid cancer (DTC) require periodic monitoring of their serum thyroglobulin levels, as it serves as a prognostic marker for DTC. Here, we report a methodology to produce SdAbs against human-Tg, by a hybrid immunization/directed-evolution approach by displaying the SdAb gene-repertoire derived from a hyperimmune camel in the T7 phage display system. We have demonstrated the immunoreactivity of anti-Tg-SdAb (KT75) in immunoassays for thyroglobulin and measured its affinity by surface plasmon resonance (KD ~ 18 picomolar). Additionally, we have shown the quantitative-binding property of SdAb for the first time in IRMA for thyroglobulin. The serum Tg values obtained from SdAb-Tg-IRMA and in-house assay using murine anti-Tg-monoclonal antibody as tracer significantly correlated, r = 0.81, p < 0.05. Our results highlight the scope of using the T7 phage display system as an alternative for the conventional M13-phage to construct single-domain antibody display libraries.
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Affiliation(s)
- Jothivel Kumarasamy
- Radiation Medicine Centre, Bhabha Atomic Research Centre, TMH Annexe Building, Parel, Mumbai 400012, India; University of Mumbai, Fort, Mumbai 400032, India
| | | | - Chandrakala Gholve
- Radiation Medicine Centre, Bhabha Atomic Research Centre, TMH Annexe Building, Parel, Mumbai 400012, India
| | - Bharti Jain
- Radiation Medicine Centre, Bhabha Atomic Research Centre, TMH Annexe Building, Parel, Mumbai 400012, India
| | - Yogesh Dhekale
- Radiation Medicine Centre, Bhabha Atomic Research Centre, TMH Annexe Building, Parel, Mumbai 400012, India
| | - Gagan Deep Gupta
- Radiation Biology & Health Science Division, BARC, Mumbai 400085, India
| | - Archana Damle
- Radiation Medicine Centre, Bhabha Atomic Research Centre, TMH Annexe Building, Parel, Mumbai 400012, India
| | | | - M G R Rajan
- Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Savita Kulkarni
- Radiation Medicine Centre, Bhabha Atomic Research Centre, TMH Annexe Building, Parel, Mumbai 400012, India; University of Mumbai, Fort, Mumbai 400032, India.
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Zhu Q, Guo D, Feng L, Sun D. Expression and Purification of the scFv from hybridoma cells secreting a monoclonal antibody against S PROTEIN of PEDV. Monoclon Antib Immunodiagn Immunother 2013; 32:41-6. [PMID: 23600505 DOI: 10.1089/mab.2012.0089] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The variable regions of the heavy chain (VH) and light chain (VL) were amplified by RT-PCR from the hybridoma 6E6, which secretes the monoclonal antibody against PEDV S protein. The VL and VH amplicons were combined using SOE-PCR by a 12 amino acid flexible linker (SSGGGGSGGGGS), which produced the scFv gene (named scFv/6E6). After sequence analysis, the scFv/6E6 gene was cloned into the prokaryotic expression vector pGEX-6p-1 with a GST-tag. The recombinant scFv/6E6 protein was successfully expressed in recombinant Escherichia coli by IPTG induction. Moreover, the recombinant scFv/6E6 protein was purified from the inclusion body form by the gel-cutting measure followed by electroelution and dialysis. The recombinant scFv/6E6 protein reported here will provide some basis for further antiviral drug research based on the scFv molecule.
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Affiliation(s)
- Qinghe Zhu
- 1 Department of Veterinary Clinical Medicine, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing, PR China
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