): The murine coronaviruses include a large collection of different strains, with each strain infecting different tissues and thus causing a unique disease pattern. Diseases include hepatitis, gastroenteritis, and chronic encephalomyelitis, the latter serving as a model for human neurodegenerative disease. Tropism of the different viruses for distinct tissues is controlled in large part by structural variations within the virion spike glycoprotein. The spike is a complex oligomeric structure that mediates virus binding to specific cellular receptors as well as fusion of viral and cellular membranes. Fulfillment of these functions delivers viral genomes into cells, thereby establishing infection and subsequent disease. Because spike is central to several essential steps in viral infection, tropism and pathogenesis, the long-term objective is to describe the molecular mechanisms by which spike proteins carry out the functions required for genome delivery. The investigator will investigate how naturally occurring variation in the coronavirus spike protein impacts the efficiency of oligomerization, incorporation into virions, and ultimate genome delivery functions. Various spikes will be synthesized from cDNA in conjunction with components required for pseudovirion assembly and virion incorporation efficiencies will be measured. The applicant will determine how the same structural variations alter the kinetics of spike binding to its cellular receptor and spike-mediated membrane fusion. Using soluble forms of the cellular receptor, he will attempt to trigger conversion of the spikes into a fusion-active conformation. Fusion conformations will be identified by liposome binding assays, and putative conformational changes will be probed using spike-specific monoclonal antibodies. The use of site-directed mutants will allow them to identify regions on the receptors that are required to stimulate the formation of fusion conformations. These findings will be used to build a model depicting various stages of coronavirus entry into cells. Such models help to understand this complex biological process and additionally can be used to reveal new targets for therapeutic antiviral agents.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS031616-09
Application #
6477339
Study Section
Virology Study Section (VR)
Program Officer
Nunn, Michael
Project Start
1993-12-15
Project End
2003-11-30
Budget Start
2001-12-01
Budget End
2003-11-30
Support Year
9
Fiscal Year
2002
Total Cost
$231,681
Indirect Cost
Name
Loyola University Chicago
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
791277940
City
Maywood
State
IL
Country
United States
Zip Code
60153