期刊
VIRUSES-BASEL
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/v12090909
关键词
SARS-CoV-2; N-terminal domain; spike glycoprotein; MERS-CoV
类别
资金
- Sanjay Gandhi Postgraduate Institute of Medical Sciences (SGPGIMS), Lucknow, India [A-21-PGI/IMP/80/2019]
- SERB/DST Gov. of India (GOI), as JC Bose National Fellowship [SR/S2/JCB-08/2010]
- UGC/SAP (GOI) [F 3.3/2016]
- SGPGIMS, Lucknow, India
COVID-19 novel coronavirus (CoV) disease caused by severe acquired respiratory syndrome (SARS)-CoV-2 manifests severe lethal respiratory illness in humans and has recently developed into a worldwide pandemic. The lack of effective treatment strategy and vaccines against the SARS-CoV-2 poses a threat to human health. An extremely high infection rate and multi-organ secondary infection within a short period of time makes this virus more deadly and challenging for therapeutic interventions. Despite high sequence similarity and utilization of common host-cell receptor, human angiotensin-converting enzyme-2 (ACE2) for virus entry, SARS-CoV-2 is much more infectious than SARS-CoV. Structure-based sequence comparison of the N-terminal domain (NTD) of the spike protein of Middle East respiratory syndrome (MERS)-CoV, SARS-CoV, and SARS-CoV-2 illustrate three divergent loop regions in SARS-CoV-2, which is reminiscent of MERS-CoV sialoside binding pockets. Comparative binding analysis with host sialosides revealed conformational flexibility of SARS-CoV-2 divergent loop regions to accommodate diverse glycan-rich sialosides. These key differences with SARS-CoV and similarity with MERS-CoV suggest an evolutionary adaptation of SARS-CoV-2 spike glycoprotein reciprocal interaction with host surface sialosides to infect host cells with wide tissue tropism.
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