Temperature-sensitive RNA-mutants of Sindbis virus and Semliki Forest virus, two members of the alphavirus group of Togaviruses, will be analyzed for their ability to continue minus-strand RNA synthesis after shift up to non-permissive temperature. Recent studies have identified one Sindbis virus mutant that was unable to continue minus-strand synthesis at non-permissive temperature, and at least one Sindbis virus mutant that may be responsible for the normal temporal cessation of minus-strand synthesis seen in a alphavirus infected cells. We propose to confirm these findings by investigation of these mutants. We will confirm the role of the """"""""regulatory"""""""" mutant by analysis of infected cells at permissive and non-permissive temperature for their presence of newly synthesized minus-strand RNA and for the requirement for continued protein synthesis for minus-strand cessation. We will determine if 26S RNA synthesis is correlated with the ability to synthesize minus-strand RNA. We will determine if more than one complementation group plays a role in this cessation. We propose to identify and characterize the Sindbis virus nonstructural proteins and to attempt to assign one of these proteins as the required viral component in the minus-strand polymerase that is temperature-sensitive in Tsll, the mutant unable to continue minus-strand synthesis at the non-permissive temperature. We will initiate studies to determine how the cessation of the function of the minus-strand polymerase may occur and to understand the interaction of the nonstructural proteins with each other.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Unknown (R22)
Project #
5R22AI015123-08
Application #
3444487
Study Section
Virology Study Section (VR)
Project Start
1978-09-01
Project End
1986-08-31
Budget Start
1985-09-01
Budget End
1986-08-31
Support Year
8
Fiscal Year
1985
Total Cost
Indirect Cost
Name
University of Toledo
Department
Type
Schools of Medicine
DUNS #
807418939
City
Toledo
State
OH
Country
United States
Zip Code
43614
Sawicki, Dorothea L; Perri, Silvia; Polo, John M et al. (2006) Role for nsP2 proteins in the cessation of alphavirus minus-strand synthesis by host cells. J Virol 80:360-71
Cohn, Jonathan A; Hashemi, Farhad B; Camarca, Margaret et al. (2005) HIV-inducing factor in cervicovaginal secretions is associated with bacterial vaginosis in HIV-1-infected women. J Acquir Immune Defic Syndr 39:340-6
Lurain, Nell S; Robert, Emmanuel S; Xu, Jiahong et al. (2004) HIV type 1 and cytomegalovirus coinfection in the female genital tract. J Infect Dis 190:619-23
Nag, Pratip; Kim, Jenney; Sapiega, Vytautas et al. (2004) Women with cervicovaginal antibody-dependent cell-mediated cytotoxicity have lower genital HIV-1 RNA loads. J Infect Dis 190:1970-8
Sawicki, Dorothea L; Silverman, Robert H; Williams, Bryan R et al. (2003) Alphavirus minus-strand synthesis and persistence in mouse embryo fibroblasts derived from mice lacking RNase L and protein kinase R. J Virol 77:1801-11
De, Indra; Fata-Hartley, Cori; Sawicki, Stanley G et al. (2003) Functional analysis of nsP3 phosphoprotein mutants of Sindbis virus. J Virol 77:13106-16
Fata, Cori L; Sawicki, Stanley G; Sawicki, Dorothea L (2002) Modification of Asn374 of nsP1 suppresses a Sindbis virus nsP4 minus-strand polymerase mutant. J Virol 76:8641-9
Fata, Cori L; Sawicki, Stanley G; Sawicki, Dorothea L (2002) Alphavirus minus-strand RNA synthesis: identification of a role for Arg183 of the nsP4 polymerase. J Virol 76:8632-40
Hafner, R; Bethel, J; Standiford, H C et al. (2001) Tolerance and pharmacokinetic interactions of rifabutin and azithromycin. Antimicrob Agents Chemother 45:1572-7
Sawicki, D; Wang, T; Sawicki, S (2001) The RNA structures engaged in replication and transcription of the A59 strain of mouse hepatitis virus. J Gen Virol 82:385-96

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