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Newly identified phosphorylation site in the vesicular stomatitis virus P protein is required for viral RNA synthesis.

Abstract：

:The vesicular stomatitis virus (VSV) RNA-dependent RNA polymerase consists of two viral proteins; the large (L) protein is the main catalytic subunit, and the phosphoprotein (P) is an essential cofactor for polymerase function. The P protein interacts with the L protein and the N-RNA template, thus connecting the polymerase to the template. P protein also binds to free N protein to maintain it in a soluble, encapsidation-competent form. Previously, five sites of phosphorylation were identified on the P protein and these sites were reported to be differentially important for mRNA synthesis or genomic replication. The previous studies were carried out by biochemical analysis of portions of the authentic viral P protein or by analysis of bacterium-expressed, exogenously phosphorylated P protein by mutagenesis. However, there has been no systematic biochemical search for phosphorylation sites on authentic, virus-expressed P protein. In this study, we analyzed the P protein isolated from VSV-infected cells for sites of phosphorylation by mass spectrometry. We report the identification of Tyr14 as a previously unidentified phosphorylation site of VSV P and show that it is essential for viral transcription and replication. However, our mass spectral analysis failed to observe the phosphorylation of previously reported C-terminal residues Ser226 and Ser227 and mutagenic analyses did not demonstrate a role for these sites in RNA synthesis.

journal_name

J Virol

journal_title

Journal of virology

authors

Mondal A,Victor KG,Pudupakam RS,Lyons CE,Wertz GW

doi

10.1128/JVI.02384-13

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

1461-72

issue

3

eissn

0022-538X

issn

1098-5514

pii

JVI.02384-13

journal_volume

88

pub_type

杂志文章

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