Mutational analysis of the virus and monoclonal antibody binding sites in MHVR, the cellular receptor of the murine coronavirus mouse hepatitis virus strain A59
| Autor: | S Gagneten, David R. Wessner, Jin Hua Lu, Nicole Beauchemin, Christine B. Cardellichio, Kathryn V. Holmes, Paul C. Shick, Gabriela S. Dveksler |
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| Rok vydání: | 1998 |
| Předmět: |
Virus genetics
Protein Conformation viruses Immunology Molecular Sequence Data Microbiology Virus Cell Line Mice Mouse hepatitis virus Antigens CD Virology Cricetinae Animals Amino Acid Sequence Receptor Peptide sequence Virus receptor activity Glycoproteins chemistry.chemical_classification Murine hepatitis virus Binding Sites biology virus diseases Antibodies Monoclonal biology.organism_classification Molecular biology Carcinoembryonic Antigen Virus-Cell Interactions chemistry Insect Science biology.protein Receptors Virus Antibody Glycoprotein Cell Adhesion Molecules |
| Zdroj: | Journal of virology. 72(3) |
| ISSN: | 0022-538X |
| Popis: | The primary cellular receptor for mouse hepatitis virus (MHV), a murine coronavirus, is MHVR (also referred to as Bgp1 a or C-CAM), a transmembrane glycoprotein with four immunoglobulin-like domains in the murine biliary glycoprotein (Bgp) subfamily of the carcinoembryonic antigen (CEA) family. Other murine glycoproteins in the Bgp subfamily, including Bgp1 b and Bgp2, also can serve as MHV receptors when transfected into MHV-resistant cells. Previous studies have shown that the 108-amino-acid N-terminal domain of MHVR is essential for virus receptor activity and is the binding site for monoclonal antibody (MAb) CC1, an antireceptor MAb that blocks MHV infection in vivo and in vitro. To further elucidate the regions of MHVR required for virus receptor activity and MAb CC1 binding, we constructed chimeras between MHVR and other members of the CEA family and tested them for MHV strain A59 (MHV-A59) receptor activity and MAb CC1 binding activity. In addition, we used site-directed mutagenesis to introduce selected amino acid changes into the N-terminal domains of MHVR and these chimeras and tested the abilities of these mutant glycoproteins to bind MAb CC1 and to function as MHV receptors. Several recombinant glycoproteins exhibited virus receptor activity but did not bind MAb CC1, indicating that the virus and MAb binding sites on the N-terminal domain of MHVR are not identical. Analysis of the recombinant glycoproteins showed that a short region of MHVR, between amino acids 34 and 52, is critical for MHV-A59 receptor activity. Additional regions of the N-terminal variable domain and the constant domains, however, greatly affected receptor activity. Thus, the molecular context in which the amino acids critical for MHV-A59 receptor activity are found profoundly influences the virus receptor activity of the glycoprotein. |
| Databáze: | OpenAIRE |
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