The objective of the proposed research is to define the cellular processes by which membrane glycoproteins are targeted to specific locations as well as the structural features of viral glycoproteins which are recognized by these processes. Particular emphasis will be placed on the involvement of sorting mechanisms in the directional transport and assembly of influenza virus polypeptides. For these studies, we will use vaccinia virus vectors to express glycoproteins in polarized epithelial cells, in order to investigate the effects of specific modifications of viral glycoprotein sequences upon the transport pathway and site of cell surface expression. The intracellular vesicles involved in transport of viral glycoproteins from the Golgi complex to the plasma membrane will be identified by immunoisolation in conjunction with temperature shift experiments, and will be characterized as to their composition and morphology. Mutants of MDCK cells will also be characterized to identify defects in cellular processes involved in glycoprotein transport. We will further characterize nonstructural proteins of influenza virus which has recently been identified as cell surface antigens. Their site of expression in polarized epithelial cells, and their association with sites of virus assembly, will be investigated by immunofluorescence and immunoelectron microscopy. The mobility of viral antigens on surfaces of cells was previously found to differ depending on the host cell and virus type. We will investigate whether these differences are intrinsic properties of the respective protein molecules, or whether they depend on other viral or cellular components. We will also investigate the intracellular localization of components of Punta Toro virus, a virus which assembles by budding at intracellular membranes and attempt to identify specific amino acid sequences which determines the location of the viral proteins.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
4R37AI012680-18
Application #
3480690
Study Section
Special Emphasis Panel (NSS)
Project Start
1975-06-01
Project End
1997-06-30
Budget Start
1992-07-01
Budget End
1993-06-30
Support Year
18
Fiscal Year
1992
Total Cost
Indirect Cost
Name
Emory University
Department
Type
Schools of Medicine
DUNS #
042250712
City
Atlanta
State
GA
Country
United States
Zip Code
30322
Spiropoulou, C F; Goldsmith, C S; Shoemaker, T R et al. (2003) Sin Nombre virus glycoprotein trafficking. Virology 308:48-63
Ravkov, E V; Compans, R W (2001) Hantavirus nucleocapsid protein is expressed as a membrane-associated protein in the perinuclear region. J Virol 75:1808-15
Ravkov, E V; Nichol, S T; Peters, C J et al. (1998) Role of actin microfilaments in Black Creek Canal virus morphogenesis. J Virol 72:2865-70
Roberts, P C; Lamb, R A; Compans, R W (1998) The M1 and M2 proteins of influenza A virus are important determinants in filamentous particle formation. Virology 240:127-37
Roberts, P C; Compans, R W (1998) Host cell dependence of viral morphology. Proc Natl Acad Sci U S A 95:5746-51
Yao, Q; Hu, X; Compans, R W (1997) Association of the parainfluenza virus fusion and hemagglutinin-neuraminidase glycoproteins on cell surfaces. J Virol 71:650-6
Blau, D M; Compans, R W (1997) Adaptation of measles virus to polarized epithelial cells: alterations in virus entry and release. Virology 231:281-9
Ravkov, E V; Nichol, S T; Compans, R W (1997) Polarized entry and release in epithelial cells of Black Creek Canal virus, a New World hantavirus. J Virol 71:1147-54
Huang, X F; Compans, R W; Chen, S et al. (1997) Polarized apical targeting directed by the signal/anchor region of simian virus 5 hemagglutinin-neuraminidase. J Biol Chem 272:27598-604
Yao, Q; Compans, R W (1996) Peptides corresponding to the heptad repeat sequence of human parainfluenza virus fusion protein are potent inhibitors of virus infection. Virology 223:103-12

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