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Site Density Functional Theory and Structural Bioinformatics Analysis of the SARS-CoV Spike Protein and hACE2 Complex

Journal Article · · Molecules
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8];  [9]
  1. Central University of Rajasthan, Ajmer (India)
  2. University of Tokyo, Kashiwa (Japan)
  3. University of Tennessee, Knoxville, TN (United States)
  4. Russian Academy of Sciences (RAS), Pushchino (Russian Federation)
  5. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  6. Russian Academy of Sciences (RAS), Ivanovo (Russian Federation)
  7. University of Tokyo, Kashiwa (Japan); RIKEN Center for Advanced Intelligence Project, Tokyo (Japan); National Institute for Materials Science (NIMS), Tsukuba (Japan)
  8. RIKEN Center for Advanced Intelligence Project, Tokyo (Japan); York University, Toronto, ON (Canada)
  9. Sikkim University, Gangtok (India)
The entry of the SARS-CoV-2, a causative agent of COVID-19, into human host cells is mediated by the SARS-CoV-2 spike (S) glycoprotein, which critically depends on the formation of complexes involving the spike protein receptor-binding domain (RBD) and the human cellular membrane receptor angiotensin-converting enzyme 2 (hACE2). Using classical site density functional theory (SDFT) and structural bioinformatics methods, we investigate binding and conformational properties of these complexes and study the overlooked role of water-mediated interactions. Analysis of the three-dimensional reference interaction site model (3DRISM) of SDFT indicates that water mediated interactions in the form of additional water bridges strongly increases the binding between SARS-CoV-2 spike protein and hACE2 compared to SARS-CoV-1-hACE2 complex. By analyzing structures of SARS-CoV-2 and SARS-CoV-1, we find that the homotrimer SARS-CoV-2 S receptor-binding domain (RBD) has expanded in size, indicating large conformational change relative to SARS-CoV-1 S protein. Protomer with the up-conformational form of RBD, which binds with hACE2, exhibits stronger intermolecular interactions at the RBD-ACE2 interface, with differential distributions and the inclusion of specific H-bonds in the CoV-2 complex. Further interface analysis has shown that interfacial water promotes and stabilizes the formation of CoV-2/hACE2 complex. This interaction causes a significant structural rigidification of the spike protein, favoring proteolytic processing of the S protein for the fusion of the viral and cellular membrane. Moreover, conformational dynamics simulations of RBD motions in SARS-CoV-2 and SARS-CoV-1 point to the role in modification of the RBD dynamics and their impact on infectivity.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2471541
Journal Information:
Molecules, Journal Name: Molecules Journal Issue: 3 Vol. 27; ISSN 1420-3049
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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