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Self-assembly Controls Self-cleavage of HHR from ASBVd (−): a Combined SANS and Modeling Study

Abstract : In the Avocado Sunblotch Viroid (ASBVd: 249-nt) from the Avsunviroidae family, a symmetric rolling-circle replication operates through an autocatalytic mechanism mediated by hammerhead ribozymes (HHR) embedded in both polarity strands. The concatenated multimeric ASBVd (+) and ASBVd (−) RNAs thus generated are processed by cleavage to unit-length where ASBVd (−) self-cleaves with more efficiency. Absolute scale small angle neutron scattering (SANS) revealed a temperature-dependent dimer association in both ASBVd (−) and its derived 79-nt HHR (−). A joint thermodynamic analysis of SANS and catalytic data indicates the rate-determining step corresponds to the dimer/monomer transition. 2D and 3D models of monomeric and dimeric HHR (−) suggest that the inter-molecular contacts stabilizing the dimer (between HI and HII domains) compete with the intra-molecular ones stabilizing the active conformation of the full-length HHR required for an efficient self-cleavage. Similar competing intra- and inter-molecular contacts are proposed in ASBVd (−) though with a remoter region from an extension of the HI domain.
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Submitted on : Monday, August 29, 2016 - 4:59:36 PM
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Fabrice Leclerc, Giuseppe Zaccai, Jacques Vergne, Martina Řìhovà, Anne Martel, et al.. Self-assembly Controls Self-cleavage of HHR from ASBVd (−): a Combined SANS and Modeling Study. Scientific Reports, Nature Publishing Group, 2016, 6 (30287), ⟨10.1038/srep30287⟩. ⟨hal-01357443⟩

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