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- W2017148872 abstract "The 23-kDa protein (p23), encoded by the 3′-proximal gene of the RNA of Citrus tristeza virus (CTV), was overexpressed in Escherichia coli fused to the maltose-binding protein and purified by affinity chromatography. Gel retardation and UV crosslinking assays demonstrated that p23 has the ability to cooperatively bind single-stranded RNA in a non-sequence-specific manner. Formation of the p23-RNA complex was dependent on the conformational state of p23 and on the presence of a basic region, but the complex was stable at high salt concentrations, suggesting that interactions other than those between the negatively charged RNA and the basic region of p23 are involved. Competition assays showed that the affinity of p23 for single-stranded and double-stranded RNA was similar but considerably higher than for single-stranded and double-stranded DNA. By use of a series of artificially generated mutants, the RNA-binding domain of p23 was mapped between positions 50–86, a region containing several basic amino acids and a putative zinc-finger domain. Additional p23-derivatives lacking the conserved residues presumably involved in coordinating the zinc ion showed RNA-binding activity, but with an apparent dissociation constant higher than the wild-type protein. These conserved residues might confer binding specificity or increase binding stability in vivo. Within the Closteroviridae family, p23 is the only protein characterized so far showing RNA-binding activity." @default.
- W2017148872 created "2016-06-24" @default.
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- W2017148872 date "2000-04-01" @default.
- W2017148872 modified "2023-10-16" @default.
- W2017148872 title "The 23-kDa Protein Coded by the 3′-Terminal Gene of Citrus Tristeza Virus Is an RNA-Binding Protein" @default.
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- W2017148872 doi "https://doi.org/10.1006/viro.2000.0235" @default.
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