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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Virol+Methods 2021 ; 292 (ä): 114141 Nephropedia Template TP
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A luciferase immunosorbent assay for quantitative detection of IgG antibodies against SARS-CoV-2 nucleoprotein #MMPMID33753172
Liang Y; Yan H; Huang L; Zhao J; Wang H; Kang M; Wan Z; Shui J; Tang S
J Virol Methods 2021[Jun]; 292 (ä): 114141 PMID33753172show ga
In this study, we developed and evaluated a luciferase immunosorbent assay (LISA) for quantitative detection of IgG antibody against SARS-CoV-2 nucleoprotein (NP). Anti-SARS-CoV-2 NP antibody in serum or plasma samples was captured by protein G-coated microtiter plate and detected using the crude cell lysates expressing Nanoluc luciferase (Nluc) enzyme fused with SARS-CoV-2 NP. After the addition of furimazine substrate, the levels of anti-SARS-CoV-2 NP IgG antibody were quantitatively measured as luciferase light units. As expected, SARS-CoV-2 NP showed cross-reactivity with the monoclonal antibodies against SARS-CoV NP, but not MERS-CoV NP-specific monoclonal antibodies or the monoclonal antibodies against SARS-CoV Spike protein. LISA for detecting murine monoclonal antibody against SARS-CoV NP showed a low limit of detection of 0.4 pg/mul and linear detection range from 0.4 pg/mul to 75 pg/mul. Furthermore, LISA had a sensitivity of 71 % when testing COVID-19 patients at the second week post onset and a specificity of 100 % when testing healthy blood donors.