Influenza viruses bud from the apical surface of polarized epithelial cells. The mechanism by which the budding is restricted to the apical surface remains unknown. We have shown that influenza viral envelope glycoproteins either hemagglutinin (HA) or neuraminidase (NA) when expressed from cloned cDNAs are also transported to the apical surface in absence of other viral proteins. Our goal is to define the structural features (""""""""signals"""""""") of HA and NA involved in transport, sorting and polarized expression. We wll continue studying the function of different domains of HA and NA and make specific alterations in the nucleotide sequence of the insert DNA to achieve the desired changes in the amino acid sequence of the polypeptides. These altered cDNA clones will be expressed and the fate of these altered proteins will be followed. Thus, we hope to determine the role of the specific domains (or amino acid sequences) of HA and NA in expression, sorting, and transport as well as in the biological functions of these two important glycoproteins. We plan to continue using eukaryotic expression vectors to express these proteins in animal cells. We are using site-specific mutations, deletions, as well as chimeric fusions between different genes to achieve these objectives. In addition, we are expressing influenza viral HA and NA in yeast (Saccharomyces cerevisiae), which may be of potential use in the development of an improved subunit vaccine.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI016348-13
Application #
3126636
Study Section
Virology Study Section (VR)
Project Start
1980-05-01
Project End
1994-04-30
Budget Start
1992-05-01
Budget End
1994-04-30
Support Year
13
Fiscal Year
1992
Total Cost
Indirect Cost
Name
University of California Los Angeles
Department
Type
Schools of Medicine
DUNS #
119132785
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Nayak, Debi P; Balogun, Rilwan A; Yamada, Hiroshi et al. (2009) Influenza virus morphogenesis and budding. Virus Res 143:147-61
Barman, Subrata; Nayak, Debi P (2007) Lipid raft disruption by cholesterol depletion enhances influenza A virus budding from MDCK cells. J Virol 81:12169-78
Hui, Eric Ka-Wai; Smee, Donald F; Wong, Min-Hui et al. (2006) Mutations in influenza virus M1 CCHH, the putative zinc finger motif, cause attenuation in mice and protect mice against lethal influenza virus infection. J Virol 80:5697-707
Hui, Eric Ka-Wai; Barman, Subrata; Tang, Dominic Ho-Ping et al. (2006) YRKL sequence of influenza virus M1 functions as the L domain motif and interacts with VPS28 and Cdc42. J Virol 80:2291-308
Hui, Eric Ka-Wai; Yap, Ee Ming; An, Dong Sung et al. (2004) Inhibition of influenza virus matrix (M1) protein expression and virus replication by U6 promoter-driven and lentivirus-mediated delivery of siRNA. J Gen Virol 85:1877-84
Nayak, Debi P; Hui, Eric Ka-Wai; Barman, Subrata (2004) Assembly and budding of influenza virus. Virus Res 106:147-65
Nayak, Debi P; Hui, Eric K W (2004) The role of lipid microdomains in virus biology. Subcell Biochem 37:443-91
Barman, Subrata; Adhikary, Lopa; Chakrabarti, Alok K et al. (2004) Role of transmembrane domain and cytoplasmic tail amino acid sequences of influenza a virus neuraminidase in raft association and virus budding. J Virol 78:5258-69
Hui, Eric Ka-Wai; Ralston, Katherine; Judd, Amrit K et al. (2003) Conserved cysteine and histidine residues in the putative zinc finger motif of the influenza A virus M1 protein are not critical for influenza virus replication. J Gen Virol 84:3105-13
Barman, Subrata; Adhikary, Lopa; Kawaoka, Yoshihiro et al. (2003) Influenza A virus hemagglutinin containing basolateral localization signal does not alter the apical budding of a recombinant influenza A virus in polarized MDCK cells. Virology 305:138-52

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