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      On the Selectivity of Heparan Sulfate Recognition by SARS-CoV-2 Spike Glycoprotein

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          Abstract

          SARS-CoV-2 infects human cells through its surface spike glycoprotein (SgP), which relies on host cell surface heparan sulfate (HS) proteoglycans that facilitate interaction with the ACE2 receptor. Targeting this process could lead to inhibitors of early steps in viral entry. Screening a microarray of 24 HS oligosaccharides against recombinant S1 and receptor-binding domain (RBD) proteins led to identification of only eight sequences as potent antagonists; results that were supported by detailed dual-filter computational studies. Competitive studies using the HS microarray suggested almost equivalent importance of IdoA2S–GlcNS6S and GlcNS3S structures, which were supported by affinity studies. Exhaustive virtual screening on a library of >93 000 sequences led to a novel pharmacophore with at least two 3- O-sulfated GlcN residues that can engineer unique selectivity in recognizing the RBD. This work puts forward the key structural motif in HS that should lead to potent and selective HS or HS-like agents against SARS-CoV-2.

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          Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding

          Roujian Lu, Xiang Zhao, Juan Li … (2021)
          Summary Background In late December, 2019, patients presenting with viral pneumonia due to an unidentified microbial agent were reported in Wuhan, China. A novel coronavirus was subsequently identified as the causative pathogen, provisionally named 2019 novel coronavirus (2019-nCoV). As of Jan 26, 2020, more than 2000 cases of 2019-nCoV infection have been confirmed, most of which involved people living in or visiting Wuhan, and human-to-human transmission has been confirmed. Methods We did next-generation sequencing of samples from bronchoalveolar lavage fluid and cultured isolates from nine inpatients, eight of whom had visited the Huanan seafood market in Wuhan. Complete and partial 2019-nCoV genome sequences were obtained from these individuals. Viral contigs were connected using Sanger sequencing to obtain the full-length genomes, with the terminal regions determined by rapid amplification of cDNA ends. Phylogenetic analysis of these 2019-nCoV genomes and those of other coronaviruses was used to determine the evolutionary history of the virus and help infer its likely origin. Homology modelling was done to explore the likely receptor-binding properties of the virus. Findings The ten genome sequences of 2019-nCoV obtained from the nine patients were extremely similar, exhibiting more than 99·98% sequence identity. Notably, 2019-nCoV was closely related (with 88% identity) to two bat-derived severe acute respiratory syndrome (SARS)-like coronaviruses, bat-SL-CoVZC45 and bat-SL-CoVZXC21, collected in 2018 in Zhoushan, eastern China, but were more distant from SARS-CoV (about 79%) and MERS-CoV (about 50%). Phylogenetic analysis revealed that 2019-nCoV fell within the subgenus Sarbecovirus of the genus Betacoronavirus, with a relatively long branch length to its closest relatives bat-SL-CoVZC45 and bat-SL-CoVZXC21, and was genetically distinct from SARS-CoV. Notably, homology modelling revealed that 2019-nCoV had a similar receptor-binding domain structure to that of SARS-CoV, despite amino acid variation at some key residues. Interpretation 2019-nCoV is sufficiently divergent from SARS-CoV to be considered a new human-infecting betacoronavirus. Although our phylogenetic analysis suggests that bats might be the original host of this virus, an animal sold at the seafood market in Wuhan might represent an intermediate host facilitating the emergence of the virus in humans. Importantly, structural analysis suggests that 2019-nCoV might be able to bind to the angiotensin-converting enzyme 2 receptor in humans. The future evolution, adaptation, and spread of this virus warrant urgent investigation. Funding National Key Research and Development Program of China, National Major Project for Control and Prevention of Infectious Disease in China, Chinese Academy of Sciences, Shandong First Medical University.
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            Cryo-EM structure of the 2019-nCoV spike in the prefusion conformation

            Daniel Wrapp, Nianshuang Wang, Kizzmekia S. Corbett … (2020)
            Structure of the nCoV trimeric spike The World Health Organization has declared the outbreak of a novel coronavirus (2019-nCoV) to be a public health emergency of international concern. The virus binds to host cells through its trimeric spike glycoprotein, making this protein a key target for potential therapies and diagnostics. Wrapp et al. determined a 3.5-angstrom-resolution structure of the 2019-nCoV trimeric spike protein by cryo–electron microscopy. Using biophysical assays, the authors show that this protein binds at least 10 times more tightly than the corresponding spike protein of severe acute respiratory syndrome (SARS)–CoV to their common host cell receptor. They also tested three antibodies known to bind to the SARS-CoV spike protein but did not detect binding to the 2019-nCoV spike protein. These studies provide valuable information to guide the development of medical counter-measures for 2019-nCoV. Science, this issue p. 1260
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              Structure of the SARS-CoV-2 spike receptor-binding domain bound to the ACE2 receptor

              Jun Lan, Jiwan Ge, Jinfang Yu … (2020)
              A new and highly pathogenic coronavirus (severe acute respiratory syndrome coronavirus-2, SARS-CoV-2) caused an outbreak in Wuhan city, Hubei province, China, starting from December 2019 that quickly spread nationwide and to other countries around the world1-3. Here, to better understand the initial step of infection at an atomic level, we determined the crystal structure of the receptor-binding domain (RBD) of the spike protein of SARS-CoV-2 bound to the cell receptor ACE2. The overall ACE2-binding mode of the SARS-CoV-2 RBD is nearly identical to that of the SARS-CoV RBD, which also uses ACE2 as the cell receptor4. Structural analysis identified residues in the SARS-CoV-2 RBD that are essential for ACE2 binding, the majority of which either are highly conserved or share similar side chain properties with those in the SARS-CoV RBD. Such similarity in structure and sequence strongly indicate convergent evolution between the SARS-CoV-2 and SARS-CoV RBDs for improved binding to ACE2, although SARS-CoV-2 does not cluster within SARS and SARS-related coronaviruses1-3,5. The epitopes of two SARS-CoV antibodies that target the RBD are also analysed for binding to the SARS-CoV-2 RBD, providing insights into the future identification of cross-reactive antibodies.
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                Author and article information

                Journal
                Journal ID (nlm-ta): ACS Med Chem Lett
                Journal ID (iso-abbrev): ACS Med Chem Lett
                Journal ID (publisher-id): ml
                Journal ID (coden): amclct
                Title: ACS Medicinal Chemistry Letters
                Publisher: American Chemical Society
                ISSN (Electronic): 1948-5875
                Publication date (Electronic): 08 October 2021
                Electronic Location Identifier: acsmedchemlett.1c00343
                Affiliations
                [† ]Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University , Richmond, Virginia 23298, United States
                [‡ ]Institute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University , Richmond, Virginia 23219, United States
                Author notes
                Author information
                https://orcid.org/0000-0002-1976-6597
                Article
                DOI: 10.1021/acsmedchemlett.1c00343
                PMC ID: 8525342
                PubMed ID: 34786180
                SO-VID: a618788e-2d98-4240-bebe-9382528d5b08
                Copyright © © 2021 American Chemical Society
                License:

                This article is made available via the PMC Open Access Subset for unrestricted RESEARCH re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

                History
                Date received : 16 June 2021
                Date accepted : 05 October 2021
                Funding
                Funded by: National Heart, Lung, and Blood Institute, doi 10.13039/100000050;
                Award ID: HL107152
                Funded by: National Cancer Institute, doi 10.13039/100000054;
                Award ID: CA241951
                Funded by: National Heart, Lung, and Blood Institute, doi 10.13039/100000050;
                Award ID: HL151133
                Categories
                Subject: Letter
                Custom metadata
                document-id-old-9 ml1c00343
                document-id-new-14 ml1c00343
                ccc-price

                ScienceOpen disciplines: Pharmaceutical chemistry
                Keywords: spike protein,glycosaminoglycans,3-o-sulfation,microarray,molecular docking,pharmacophore modeling
                Data availability:
                ScienceOpen disciplines: Pharmaceutical chemistry
                Keywords: spike protein, glycosaminoglycans, 3-o-sulfation, microarray, molecular docking, pharmacophore modeling

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