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In situ structural analysis of SARS-CoV-2 spike reveals flexibility mediated by three hinges #MMPMID32817270
Turonova B; Sikora M; Schurmann C; Hagen WJH; Welsch S; Blanc FEC; von Bulow S; Gecht M; Bagola K; Horner C; van Zandbergen G; Landry J; de Azevedo NTD; Mosalaganti S; Schwarz A; Covino R; Muhlebach MD; Hummer G; Krijnse Locker J; Beck M
Science 2020[Oct]; 370 (6513): 203-208 PMID32817270show ga
The spike protein (S) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is required for cell entry and is the primary focus for vaccine development. In this study, we combined cryo-electron tomography, subtomogram averaging, and molecular dynamics simulations to structurally analyze S in situ. Compared with the recombinant S, the viral S was more heavily glycosylated and occurred mostly in the closed prefusion conformation. We show that the stalk domain of S contains three hinges, giving the head unexpected orientational freedom. We propose that the hinges allow S to scan the host cell surface, shielded from antibodies by an extensive glycan coat. The structure of native S contributes to our understanding of SARS-CoV-2 infection and potentially to the development of safe vaccines.