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. 2021 Jan 14;13(1):109. doi: 10.3390/v13010109

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© 2021 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Domain structure of SARS-S and SARS-2-S. (A) Key domains in SARS-S and SARS-2-S. SP, signal peptide; NTD, N-terminal domain; RBD, receptor-binding domain; FP, fusion peptide; IFP, internal fusion peptide; HR, heptad repeats; TM, transmembrane domain; CT, cytoplasmic tail. The top and bottom numbers in each domain pertain to SARS-S and SARS-2-S, respectively. The red arrows indicate cleavage sites, and their numbers pertain to SARS-2-S; (B) Alignment of SP between SARS-S (top) and SARS-2-S (bottom); (C,D) Alignment of two inter-domain segments; (E) HR1 in SARS-S and SARS-2-S, together with the top view of a helix showing hydrophobic positions a and d on the same side; (F) Hydrophobicity plot generated from DAMBE [16].