TY - JOUR T1 - Mutations on RBD of SARS-CoV-2 Omicron variant result in stronger binding to human ACE2 receptor JF - bioRxiv DO - 10.1101/2021.12.10.472102 SP - 2021.12.10.472102 AU - Cecylia S. Lupala AU - Yongjin Ye AU - Hong Chen AU - Xiao-Dong Su AU - Haiguang Liu Y1 - 2021/01/01 UR - http://biorxiv.org/content/early/2021/12/17/2021.12.10.472102.abstract N2 - The COVID-19 pandemic caused by the SARS-CoV-2 virus has led to more than 270 million infections and 5.3 million of deaths worldwide. Several major variants of SARS-CoV-2 have emerged and posed challenges in controlling the pandemic. The recently occurred Omicron variant raised serious concerns about reducing the efficacy of vaccines and neutralization antibodies due to its vast mutations. We have modelled the complex structure of the human ACE2 protein and the receptor binding domain (RBD) of Omicron Spike protein (S-protein), and conducted atomistic molecular dynamics simulations to study the binding interactions. The analysis shows that the Omicron RBD binds more strongly to the human ACE2 protein than the original strain. The mutations at the ACE2-RBD interface enhance the tight binding by increasing hydrogen bonding interaction and enlarging buried solvent accessible surface area.Competing Interest StatementThe authors have declared no competing interest. ER -