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基本情報
登録情報 | データベース: PDB / ID: 7bny | ||||||||||||
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タイトル | Structure of 2A protein from encephalomyocarditis virus (EMCV) | ||||||||||||
![]() | Genome polyprotein | ||||||||||||
![]() | VIRAL PROTEIN / EMCV / cardiovirus / 2A / picornavirus / frameshifting / PRF / RNA-binding protein / protein-mediated frameshifting / ribosome-binding protein / beta-shell | ||||||||||||
機能・相同性 | ![]() positive stranded viral RNA replication / host cell nucleolus / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of RIG-I activity / picornain 3C / T=pseudo3 icosahedral viral capsid / host cell cytoplasmic vesicle membrane / protein complex oligomerization / monoatomic ion channel activity / symbiont-mediated suppression of host gene expression / RNA helicase activity ...positive stranded viral RNA replication / host cell nucleolus / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of RIG-I activity / picornain 3C / T=pseudo3 icosahedral viral capsid / host cell cytoplasmic vesicle membrane / protein complex oligomerization / monoatomic ion channel activity / symbiont-mediated suppression of host gene expression / RNA helicase activity / RNA helicase / symbiont entry into host cell / induction by virus of host autophagy / RNA-directed RNA polymerase / cysteine-type endopeptidase activity / RNA-dependent RNA polymerase activity / virus-mediated perturbation of host defense response / DNA-templated transcription / virion attachment to host cell / structural molecule activity / ATP hydrolysis activity / proteolysis / RNA binding / ATP binding / membrane / metal ion binding 類似検索 - 分子機能 | ||||||||||||
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![]() | Hill, C.H. / Napthine, S. / Pekarek, L. / Kibe, A. / Firth, A.E. / Graham, S.C. / Caliskan, N. / Brierley, I. | ||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural and molecular basis for Cardiovirus 2A protein as a viral gene expression switch. 著者: Chris H Hill / Lukas Pekarek / Sawsan Napthine / Anuja Kibe / Andrew E Firth / Stephen C Graham / Neva Caliskan / Ian Brierley / ![]() ![]() 要旨: Programmed -1 ribosomal frameshifting (PRF) in cardioviruses is activated by the 2A protein, a multi-functional virulence factor that also inhibits cap-dependent translational initiation. Here we ...Programmed -1 ribosomal frameshifting (PRF) in cardioviruses is activated by the 2A protein, a multi-functional virulence factor that also inhibits cap-dependent translational initiation. Here we present the X-ray crystal structure of 2A and show that it selectively binds to a pseudoknot-like conformation of the PRF stimulatory RNA element in the viral genome. Using optical tweezers, we demonstrate that 2A stabilises this RNA element, likely explaining the increase in PRF efficiency in the presence of 2A. Next, we demonstrate a strong interaction between 2A and the small ribosomal subunit and present a cryo-EM structure of 2A bound to initiated 70S ribosomes. Multiple copies of 2A bind to the 16S rRNA where they may compete for binding with initiation and elongation factors. Together, these results define the structural basis for RNA recognition by 2A, show how 2A-mediated stabilisation of an RNA pseudoknot promotes PRF, and reveal how 2A accumulation may shut down translation during virus infection. | ||||||||||||
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