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• W2430369543 abstract "The transcription factor VP30 of the non-segmented RNA negative strand Ebola virus balances viral transcription and replication. Here, we comprehensively studied RNA binding by VP30. Using a novel VP30:RNA electrophoretic mobility shift assay, we tested truncated variants of 2 potential natural RNA substrates of VP30 - the genomic Ebola viral 3′-leader region and its complementary antigenomic counterpart (each ∼155 nt in length) - and a series of other non-viral RNAs. Based on oligonucleotide interference, the major VP30 binding region on the genomic 3′-leader substrate was assigned to the internal expanded single-stranded region (∼ nt 125–80). Best binding to VP30 was obtained with ssRNAs of optimally ∼ 40 nt and mixed base composition; underrepresentation of purines or pyrimidines was tolerated, but homopolymeric sequences impaired binding. A stem-loop structure, particularly at the 3′-end or positioned internally, supports stable binding to VP30. In contrast, dsRNA or RNAs exposing large internal loops flanked by entirely helical arms on both sides are not bound. Introduction of a 5´-Cap(0) structure impaired VP30 binding. Also, ssDNAs bind substantially weaker than isosequential ssRNAs and heparin competes with RNA for binding to VP30, indicating that ribose 2′-hydroxyls and electrostatic contacts of the phosphate groups contribute to the formation of VP30:RNA complexes. Our results indicate a rather relaxed RNA binding specificity of filoviral VP30, which largely differs from that of the functionally related transcription factor of the Paramyxoviridae which binds to ssRNAs as short as 13 nt with a preference for oligo(A) sequences." @default.
• W2430369543 created "2016-06-24" @default.
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• W2430369543 date "2016-07-08" @default.
• W2430369543 modified "2023-10-16" @default.
• W2430369543 title "RNA binding specificity of Ebola virus transcription factor VP30" @default.
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• W2430369543 doi "https://doi.org/10.1080/15476286.2016.1194160" @default.
• W2430369543 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5013996" @default.
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• W2430369543 hasPublicationYear "2016" @default.
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