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Published in: Virology Journal 1/2022

Open Access 01-12-2022 | SARS-CoV-2 | Methodology

Preparation of the luciferase-labeled antibody for improving the detection sensitivity of viral antigen

Authors: Ying Tang, Yuchang Li, Sen Zhang, Jing Li, Yi Hu, Wenguang Yang, Yuehong Chen, Chengfeng Qin, Tao Jiang, Xiaoping Kang

Published in: Virology Journal | Issue 1/2022

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Abstract

Background

Viral antigen detection test is the most common method used to detect viruses in the field rapidly. However, due to the low sensitivity, it can only be used as an auxiliary diagnosis method for virus infection. Improving sensitivity is crucial for developing more accurate viral antigen tests. Nano luciferase (Nluc) is a sensitive reporter that has not been used in virus detection.

Results

In this study, we produced an intracellularly Nluc labeled detection antibody (Nluc-ch2C5) and evaluated its ability to improve the detection sensitivity of respiratory syndrome coronavirus 2 (SARS-CoV-2) antigens. Compared with the traditional horse-radish peroxidase (HRP) labeled antibody (HRP-ch2C5), Nluc-ch2C5 was 41 times more sensitive for inactivated SARS-CoV-2 virus by sandwich chemiluminescence ELISA. Then we applied Nluc-ch2C5 to establish an automatic magnet chemiluminescence immune assay (AMCA) for the SARS-CoV-2 viral spike protein, the limit of detection was 68 pfu/reaction. The clinical sensitivity and specificity reached 75% (24/32) and 100% (48/48) using 32 PCR-positive and 48 PCR-negative swab samples for clinical evaluation, which is more sensitive than the commercial ELSA kit and colloid gold strip kit.

Conclusions

Here, monoclonal antibody ch2C5 served as a model antibody and the SARS-CoV-2 served as a model pathogen. The Nluc labeled detecting antibody (Nluc-ch2C5) significantly improved the detection sensitivity of SARS-CoV-2 antigen. This labeling principle applies to other viral infections, so this labeling and test format could be expected to play an important role in detecting other virus antigens.
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Metadata
Title
Preparation of the luciferase-labeled antibody for improving the detection sensitivity of viral antigen
Authors
Ying Tang
Yuchang Li
Sen Zhang
Jing Li
Yi Hu
Wenguang Yang
Yuehong Chen
Chengfeng Qin
Tao Jiang
Xiaoping Kang
Publication date
01-12-2022
Publisher
BioMed Central
Keyword
SARS-CoV-2
Published in
Virology Journal / Issue 1/2022
Electronic ISSN: 1743-422X
DOI
https://doi.org/10.1186/s12985-022-01855-6

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