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Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2020 ; 11 (1): 3070 Nephropedia Template TP
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Cryo-EM structures of HKU2 and SADS-CoV spike glycoproteins provide insights into coronavirus evolution #MMPMID32555182
Yu J; Qiao S; Guo R; Wang X
Nat Commun 2020[Jun]; 11 (1): 3070 PMID32555182show ga
Porcine coronavirus SADS-CoV has been identified from suckling piglets with severe diarrhea in southern China in 2017. The SADS-CoV genome shares ~95% identity to that of bat alpha-coronavirus HKU2, suggesting that SADS-CoV may have emerged from a natural reservoir in bats. Here we report the cryo-EM structures of HKU2 and SADS-CoV spike (S) glycoprotein trimers at 2.38 A and 2.83 A resolution, respectively. We systematically compare the domains of HKU2 spike with those of alpha-, beta-, gamma-, and delta-coronavirus spikes, showing that the S1 subunit N- and C-terminal domains of HKU2/SADS-CoV are ancestral domains in the evolution of coronavirus spike proteins. The connecting region after the fusion peptide in the S2 subunit of HKU2/SADS-CoV adopts a unique conformation. These results structurally demonstrate a close evolutionary relationship between HKU2/SADS-CoV and beta-coronavirus spikes and provide insights into the evolution and cross-species transmission of coronaviruses.