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billwilliam
@billwilliam321
I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.
加入 September 2024
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Threonine372 is conserved for spike proteins of all bat or pangolin SARS-CoV-2related coronaviruses, including pangolinCoV-MP789 (GenBank: MT121216.1), pangolinCoV-GD (GenBank: OQ297708.1 ), BANAL-20-236 (GenBank: MZ937003.2), BANAL-20-103 (GenBank: MZ937001.1), RshSTT182/200 (PDB: 7XBH), BANAL-20-52 (GenBank: MZ937000.1), RaTG13 (GenBank: MN996532.2), pangolinCoV-GX-P2V (MW532698.1), Rc-o319 (LC556375.1), Rs7896 (GenBank: OL674074.1), Rs4874 (GenBank: KY417150.1), ZC45 (GenBank: MG772933.1), RpYN06 (GenBank: MZ081381.1), RacCS203 (GenBank: MW251308.1), and RmYN02 (GenBank: ON131092.1). T372A is a human-adaptive mutation for SARS-CoV-2 only. According to Robert Garry, T372A substitution removes glycan at N370 and makes the spike protein more likely to adopt the open conformation, thus allowing the RBD to bind hACE2 receptor more efficiently. The downside is that the spike protein in open conformation becomes more sensitive to low pH. Therefore, SARS-CoV-2 prefers replication in the respiratory tract rather than the gastrointestinal tract. By BLAST search, I found Khosta-2 (GenBank: QVN46569.1) is the only bat coronavirus with alanine at this position, although it has a serine insertion upstream before position 371. The N370 of Khosta-2 spike protein is probably glycosylated just like in other bat coronaviruses.
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