Expression, purification and immunological characterization of recombinant nucleocapsid protein fragment from SARS-CoV-2.

Expression, purification and immunological characterization of recombinant nucleocapsid protein fragment from SARS-CoV-2.
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DOI:
10.1016/j.virol.2021.01.004
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发表时间:
2021-05
期刊:
影响因子:
3.7
通讯作者:
Cirkovic Velickovic T
Cirkovic Velickovic T
中科院分区:
医学3区
文献类型:
--
作者:
Djukic T;Mladenovic M;Stanic-Vucinic D;Radosavljevic J;Smiljanic K;Sabljic L;Devic M;Cujic D;Vasovic T;Simovic A;Radomirovic M;Cirkovic Velickovic T

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Serological testing is important method for diagnosis of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Nucleocapsid (N) protein is the most abundant virus derived protein and strong immunogen. We aimed to find its efficient, low-cost production. SARS-CoV-2 recombinant fragment of nucleocapsid protein (rfNP; 58–419 aa) was expressed in E. coli in soluble form, purified and characterized biochemically and immunologically. Purified rfNP has secondary structure of full-length recombinant N protein, with high percentage of disordered structure (34.2%) and of β-sheet (40.7%). rfNP was tested in immunoblot using sera of COVID-19 convalescent patients. ELISA was optimized with sera of RT-PCR confirmed positive symptomatic patients and healthy individuals. IgG detection sensitivity was 96% (47/50) and specificity 97% (67/68), while IgM detection was slightly lower (94% and 96.5%, respectively). Cost-effective approach for soluble recombinant N protein fragment production was developed, with reliable IgG and IgM antibodies detection of SARS-CoV-2 infection.
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