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. 2022 Sep 5;12:15057. doi: 10.1038/s41598-022-18517-w

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Recombinant proteins of the spike glycoprotein and nucleocapsid of SARS-CoV-2 were obtained, and the primary and secondary structures were analyzed. (A) Spike protein. Upper panel and lower right panel, analysis of the primary and secondary amino acid sequences showing the extracellular, TM (transmembrane) and cytoplasmic (C) localization of each amino acid. Purple diamonds represent glycosylated residues. (B) N protein. Upper panel and lower right panel showing analysis of the primary and secondary amino acid sequences with intraviron localization, phosphorylated amino acids, RNA-binding and dimerization domains. In both proteins, selected peptides are shown in red in 2D structure, and the peptide signal is marked in blue. Middle panel in (A) and (B): electrophoresis and Coomassie blue staining of recombinant RBD, S trimer, or N. MWM molecular weight marker.