Abstract:
:Measles virus (MeV), like all viruses of the order Mononegavirales, utilizes a complex consisting of genomic RNA, nucleoprotein, the RNA-dependent RNA polymerase, and a polymerase cofactor, the phosphoprotein (P), for transcription and replication. We previously showed that a recombinant MeV that does not express another viral protein, C, has severe transcription and replication deficiencies, including a steeper transcription gradient than the parental virus and generation of defective interfering RNA. This virus is attenuated in vitro and in vivo However, how the C protein operates and whether it is a component of the replication complex remained unclear. Here, we show that C associates with the ribonucleocapsid and forms a complex that can be purified by immunoprecipitation or ultracentrifugation. In the presence of detergent, the C protein is retained on purified ribonucleocapsids less efficiently than the P protein and the polymerase. The C protein is recruited to the ribonucleocapsid through its interaction with the P protein, as shown by immunofluorescence microscopy of cells expressing different combinations of viral proteins and by split luciferase complementation assays. Forty amino-terminal C protein residues are dispensable for the interaction with P, and the carboxyl-terminal half of P is sufficient for the interaction with C. Thus, the C protein, rather than being an "accessory" protein as qualified in textbooks so far, is a ribonucleocapsid-associated protein that interacts with P, thereby increasing replication accuracy and processivity of the polymerase complex.IMPORTANCE Replication of negative-strand RNA viruses relies on two components: a helical ribonucleocapsid and an RNA-dependent RNA polymerase composed of a catalytic subunit, the L protein, and a cofactor, the P protein. We show that the measles virus (MeV) C protein is an additional component of the replication complex. We provide evidence that the C protein is recruited to the ribonucleocapsid by the P protein and map the interacting segments of both C and P proteins. We conclude that the primary function of MeV C is to improve polymerase processivity and accuracy, rather than uniquely to antagonize the type I interferon response. Since most viruses of the Paramyxoviridae family express C proteins, their primary function may be conserved.
journal_name
J Viroljournal_title
Journal of virologyauthors
Pfaller CK,Bloyet LM,Donohue RC,Huff AL,Bartemes WP,Yousaf I,Urzua E,Clavière M,Zachary M,de Masson d'Autume V,Carson S,Schieferecke AJ,Meyer AJ,Gerlier D,Cattaneo Rdoi
10.1128/JVI.01733-19subject
Has Abstractpub_date
2020-01-31 00:00:00issue
4eissn
0022-538Xissn
1098-5514pii
JVI.01733-19journal_volume
94pub_type
杂志文章abstract::The bluetongue virus (BTV) minor protein VP4, with molecular mass of 76 kDa, is one of the seven structural proteins and is located within the inner capsid of the virion. The protein has a putative leucine zipper near the carboxy terminus of the protein. In this study, we have investigated the functional activity of t...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.72.4.2983-2990.1998
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abstract::Deletion mutants of simian virus 40 (SV40) with lesions at the three DdeI sites near the 3' end of the early region were constructed. Mutants with deletions at 0.203 and 0.219 map units (mu) which did not change the large T antigen reading frame were viable. This extends slightly the upstream boundary for the location...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.47.3.487-494.1983
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abstract::Arenaviruses are rodent-borne viruses with a bisegmented RNA genome. A genetically unique arenavirus, Lujo virus, was recently discovered as the causal agent of a nosocomial outbreak of acute febrile illness with hemorrhagic manifestations in Zambia and South Africa. The outbreak had a case fatality rate of 80%. A rev...
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doi:10.1128/JVI.01144-12
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doi:10.1128/JVI.02247-07
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pub_type: 杂志文章
doi:10.1128/JVI.79.23.14507-14515.2005
更新日期:2005-12-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.29.1.143-152.1979
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.66.9.5553-5560.1992
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pub_type: 杂志文章
doi:10.1128/JVI.70.5.2861-2868.1996
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journal_title:Journal of virology
pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.70.8.5642-5645.1996
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.65.5.2155-2163.1991
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.62.2.479-487.1988
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journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:1972-02-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.67.7.3885-3890.1993
更新日期:1993-07-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.14.1.162-169.1974
更新日期:1974-07-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
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abstract::Nonstructural protein 5B (NS5B) of bovine viral diarrhea virus (BVDV) contains sequence motifs that are predictive of an RNA-dependent RNA polymerase activity. We describe the expression and purification of the BVDV NS5B protein derived from an infectious cDNA clone of BVDV (NADL strain). BVDV NS5B protein was active ...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.72.11.9365-9369.1998
更新日期:1998-11-01 00:00:00