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. 2020 Sep 9;105:145–160. doi: 10.1016/j.tifs.2020.08.020

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© 2020 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 2 — The structure of SARS-CoV-2 on the basis of (Mousavizadeh & Ghasemi, 2020; Shang et al., 2020; The Enemy Within, 2020.; Wang, Xia, et al., 2020). (A) The structure of a SARS-CoV-2 particle. (B) A scheme of the structure of coronavirus spike. S1, receptor-binding subunit; S2, membrane fusion subunit; TMD, transmembrane domain; IC, intracellular tail; VE, viral envelope. The receptor binding domain (RBD) is switching between a standing-up position (u) and a lying-down position (x). FP (fusion peptide), HR1 (heptad repeat 1), and HR2 (heptad repeat 2) are structural elements in a coronavirus S2 subunit. Arrow shows the protease cleavage site.