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- W2076301890 abstract "Chrysanthemum chlorotic mottle viroid (CChMVd) RNA (398-401 nucleotides) can form hammerhead ribozymes that play a functional role in its replication through a rolling-circle mechanism. In contrast to most other viroids, which adopt rod-like or quasi-rod-like secondary structures of minimal free energy, the computer-predicted conformations of CChMVd and Peach latent mosaic viroid (PLMVd) RNAs are branched. Moreover, the covariations found in a number of natural CChMVd variants support that the same or a closely related conformation exists in vivo. Here we report that the CChMVd natural variability also supports that the branched conformation is additionally stabilized by a kissing-loop interaction resembling another one proposed in PLMVd from in vitro assays. Moreover, site-directed mutagenesis combined with bioassays and progeny analysis showed that: (1) single CChMVd mutants affecting the kissing loops had low or no infectivity at all, whereas infectivity was recovered in double mutants restoring the interaction; (2) mutations affecting the structure of the regions adjacent to the kissing loops reverted to wild type or led to rearranged stems, also supporting their interaction; and (3) the interchange between 4 nucleotides of each of the two kissing loops generated a viable CChMVd variant with eight mutations. PAGE analysis under denaturing and nondenaturing conditions revealed that the kissing-loop interaction determines proper in vitro folding of CChMVd RNA. Preservation of a similar kissing-loop interaction in two hammerhead viroids with an overall low sequence similarity suggests that it facilitates in vivo the adoption and stabilization of a compact folding critical for viroid viability." @default.
- W2076301890 created "2016-06-24" @default.
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- W2076301890 date "2005-05-31" @default.
- W2076301890 modified "2023-10-14" @default.
- W2076301890 title "A kissing-loop interaction in a hammerhead viroid RNA critical for its in vitro folding and in vivo viability" @default.
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- W2076301890 doi "https://doi.org/10.1261/rna.2230605" @default.
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