Host factors associated with the Sindbis virus RNA-dependent RNA polymerase: role for G3BP1 and G3BP2 in virus replication.
نویسندگان
چکیده
Sindbis virus (SINV) is the prototype member of the Alphavirus genus, whose members cause severe human diseases for which there is no specific treatment. To ascertain host factors important in the replication of the SINV RNA genome, we generated a SINV expressing nsP4, the viral RNA-dependent RNA polymerase, with an in-frame 3xFlag epitope tag. Proteomic analysis of nsP4-containing complexes isolated from cells infected with the tagged virus revealed 29 associated host proteins. Of these, 10 proteins were associated only at a later time of infection (12 h), 14 were associated both early and late, and five were isolated only at the earlier time (6 h postinfection). These results demonstrate the dynamic nature of the virus-host interaction that occurs over the course of infection and suggest that different host proteins may be required for the multiple functions carried out by nsP4. Two related proteins found in association with nsP4 at both times of infection, GTPase-activating protein (SH3 domain) binding protein 1 (G3BP1) and G3BP2 were also previously identified as associated with SINV nsP2 and nsP3. We demonstrate a likely overlapping role for these host factors in limiting SINV replication events. The present study also identifies 10 host factors associated with nsP4 6 h after infection that were not found to be associated with nsP2 or nsP3. These factors are candidates for playing important roles in the RNA replication process. Identifying host factors essential for replication should lead to new strategies to interrupt alphavirus replication.
منابع مشابه
Host factors associated with the Sindbis virus RNA - dependent RNA polymerase : 1 a role for G 3 BP 1 and G 3 BP 2 in virus replication
Host factors associated with the Sindbis virus RNA-dependent RNA polymerase: 1 a role for G3BP1 and G3BP2 in virus replication 2 3 Ileana M. Cristea, Heather Rozjabek, Kelly R. Molloy, Sophiya Karki, Laura L. 4 White, Charles M. Rice, Michael P. Rout, Brian T. Chait and Margaret R. 5 MacDonald 6 7 Department of Molecular Biology, Princeton University, Lewis Thomas Laboratory, 8 Washington Road,...
متن کاملHost factors associated with the Sindbis virus RNA - dependent RNA polymerase : 1 a role for G 3 BP 1 and G 3 BP 2 in virus replication 2 3
متن کامل
Different types of nsP3-containing protein complexes in Sindbis virus-infected cells.
Alphaviruses represent a serious public health threat and cause a wide variety of diseases, ranging from severe encephalitis, which can result in death or neurological sequelae, to mild infection, characterized by fever, skin rashes, and arthritis. In the infected cells, alphaviruses express only four nonstructural proteins, which function in the synthesis of virus-specific RNAs and in modifica...
متن کاملConstruction of a Minigenome Rescue System for Measles Virus, AIK-c Strain
Background:In the recent decade, the reverse genetics method has been broadly used for rescue of negative-stranded RNA viruses from cDNA or viral minigenomes. This technique has been applied to study different steps in virus replication and virus-host interactions. Reverse genetics could also be implemented for design of new vaccines. The T7 RNA polymerase activity as well as virus (nucleocapsi...
متن کاملThe Ninth Biennial All-iowa Virology Symposium
1. Stress Granule Modulation by Mammalian Orthoreovirus Factories Promisree Choudhury and Cathy L. Miller Department of Veterinary Microbiology and Preventive Medicine, Iowa State University Phosphorylation of eIF2α induces formation of discrete cytoplasmic inclusions called stress granules (SG). SGs are comprised of translationaly silenced mRNAs, translation initiation factors, ribosomal prote...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of virology
دوره 84 13 شماره
صفحات -
تاریخ انتشار 2010