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Protein & Peptide Letters

Editor-in-Chief

ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

Letter Article

Generation and Characterization of Monoclonal Antibodies Against Tth DNA Polymerase and its Application to Hot-Start PCR

Author(s): Yuting Tang, Xiaoyu Chen, Jian Zhang, Jin Wang, Wenhao Hu, Songbai Liu, Zhidan Luo* and Henghao Xu*

Volume 28, Issue 10, 2021

Published on: 05 August, 2021

Page: [1090 - 1098] Pages: 9

DOI: 10.2174/0929866528666210805122117

Price: $65

Abstract

Background: As a heat-resistant polymerase, Thermus thermophilus (Tth) DNA polymerase can be widely used in Polymerase Chain Reaction (PCR). However, its non-specific amplification phenomenon is serious, which greatly limits development.

Objective: In this study, we prepared Tth monoclonal antibodies against Tth DNA polymerase and researched their application in hot-start PCR.

Methods: Tth was recombinantly expressed and purified, and used as an antigen to immunize BALB/ c mice to obtain monoclonal antibodies. The qualified monoclonal antibody and Tth were incubated for a period of time at a certain temperature to obtain the hot-start Tth. We tested the polymerase activity and exonuclease activity blocking the performance of hot-start Tth. Finally, the hot-start Tth was applied to one-step RT-PCR.

Results: Tth with a purity of >95% was obtained, and ten monoclonal antibodies were obtained by immunization. After incubation, three monoclonal antibodies were identified that could inhibit the polymerase activity of Tth at low temperature. Furthermore, these three antibodies successfully eliminated non-specific amplification in practical applications.

Conclusion: Three monoclonal antibodies were successfully validated. Among them, monoclonal antibody 9 had the best overall effect. They possess the function of inhibiting at low temperature and releasing at high temperature, which can be used as Tth polymerase inhibitors in the field of molecular diagnostics.

Keywords: Tth DNA polymerase, monoclonal antibody, hot-start, PCR, qPCR, inhibitor.

Graphical Abstract
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