UMMS Affiliation

Massachusetts Biologic Laboratories

Publication Date

4-14-2004

Document Type

Article

Subjects

Amino Acids; Animals; Cell Line; Cercopithecus aethiops; Codon; Flow Cytometry; Humans; Ligands; Membrane Glycoproteins; Mutation; Receptors, Virus; SARS Virus; Structure-Activity Relationship; Vero Cells; Viral Envelope Proteins

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

A novel coronavirus, severe acute respiratory syndrome coronavirus (SARS-CoV), has recently been identified as the causative agent of severe acute respiratory syndrome (SARS). SARS-CoV appears similar to other coronaviruses in both virion structure and genome organization. It is known for other coronaviruses that the spike (S) glycoprotein is required for both viral attachment to permissive cells and for fusion of the viral envelope with the host cell membrane. Here we describe the construction and expression of a soluble codon-optimized SARS-CoV S glycoprotein comprising the first 1,190 amino acids of the native S glycoprotein (S(1190)). The codon-optimized and native S glycoproteins exhibit similar molecular weight as determined by Western blot analysis, indicating that synthetic S glycoprotein is modified correctly in a mammalian expression system. S(1190) binds to the surface of Vero E6 cells, a cell permissive to infection, as demonstrated by fluorescence-activated cell sorter analysis, suggesting that S(1190) maintains the biologic activity present in native S glycoprotein. This interaction is blocked with serum obtained from recovering SARS patients, indicating that the binding is specific. In an effort to map the ligand-binding domain of the SARS-CoV S glycoprotein, carboxy- and amino-terminal truncations of the S(1190) glycoprotein were constructed. Amino acids 270 to 510 were the minimal receptor-binding region of the SARS-CoV S glycoprotein as determined by flow cytometry. We speculate that amino acids 1 to 510 of the SARS-CoV S glycoprotein represent a unique domain containing the receptor-binding site (amino acids 270 to 510), analogous to the S1 subunit of other coronavirus S glycoproteins.

Rights and Permissions

Citation: J Virol. 2004 May;78(9):4552-60.

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Journal of virology

PubMed ID

15078936

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