Orthomyxoviruses (influenza virus) segmented negative strand RNA viruses, constitute an important group of human and animal pathogen. The long term goal of our project is to elucidate the processes involved in the replication of standard as well as defective interfering (DI) RNAs. In addition, we want to delineate the steps involved in the amplification of DI RNAs and DI-mediated interference of standard virus replication. During the previous project periods, we have shown that influenza DI particles contain, in addition to standard RNA segments, small subgenomic RNAs (DI RNAS) which are responsible for DI-mediated interference. These DI RNAs arise predominantly, if not exclusively, from the three polymerase (P) genes (PBl, PB2 PA) by one or more internal deletions. These DI RNAS; therefore, retain both 5' and 3' sequences of the progenitor genes and are transcriptionally active both in vitro and in infected cells. In addition, some of these transcripts are produce defective proteins. The objective of the present project is to answer a number of questions using DI RNA as a marker, we want to determine if the assembly and packaging of influenza virus eight RNA segments occur randomly or in a selective fashion. This would answer a long standing puzzle of RNAs (RNPs) into infectious particles. Since influenza replication and transcription take place in the cellular nuclei, we would like to define the determinants required for transporting these P proteins into the nuclei. Furthermore, since polymerase protein function as 3P RNP complex, we would like to define the steps and requirements of 3P complex formation and finally, use the 3P complex in reconstituting an in vitro transcription replication system. These experiments would enable us to define the function of individual P proteins and the locatio of critical domain(s) and site(s) in the RNA and proteins involved in transcription and replication.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI012749-15
Application #
3125280
Study Section
Virology Study Section (VR)
Project Start
1975-06-01
Project End
1994-07-31
Budget Start
1990-08-01
Budget End
1991-07-31
Support Year
15
Fiscal Year
1990
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
Biswas, S K; Nayak, D P (1996) Influenza virus polymerase basic protein 1 interacts with influenza virus polymerase basic protein 2 at multiple sites. J Virol 70:6716-22
Kundu, A; Nayak, D P (1994) Analysis of the signals for polarized transport of influenza virus (A/WSN/33) neuraminidase and human transferrin receptor, type II transmembrane proteins. J Virol 68:1812-8
Sanderson, C M; Wu, H H; Nayak, D P (1994) Sendai virus M protein binds independently to either the F or the HN glycoprotein in vivo. J Virol 68:69-76
Hogue, B G; Nayak, D P (1994) Deletion mutation in the signal anchor domain activates cleavage of the influenza virus neuraminidase, a type II transmembrane protein. J Gen Virol 75 ( Pt 5):1015-22
Biswas, S K; Nayak, D P (1994) Mutational analysis of the conserved motifs of influenza A virus polymerase basic protein 1. J Virol 68:1819-26
Gujuluva, C N; Kundu, A; Murti, K G et al. (1994) Abortive replication of influenza virus A/WSN/33 in HeLa229 cells: defective viral entry and budding processes. Virology 204:491-505
Sanderson, C M; McQueen, N L; Nayak, D P (1993) Sendai virus assembly: M protein binds to viral glycoproteins in transit through the secretory pathway. J Virol 67:651-63
Rey, O; Nayak, D P (1992) Nuclear retention of M1 protein in a temperature-sensitive mutant of influenza (A/WSN/33) virus does not affect nuclear export of viral ribonucleoproteins. J Virol 66:5815-24
Hogue, B G; Nayak, D P (1992) Synthesis and processing of the influenza virus neuraminidase, a type II transmembrane glycoprotein. Virology 188:510-7
Kundu, A; Jabbar, M A; Nayak, D P (1991) Cell surface transport, oligomerization, and endocytosis of chimeric type II glycoproteins: role of cytoplasmic and anchor domains. Mol Cell Biol 11:2675-85

Showing the most recent 10 out of 20 publications