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. 2001 Jun;7(6):887–895. doi: 10.1017/s1355838201002473

Imaging of single hairpin ribozymes in solution by atomic force microscopy.

M J Fay 1, N G Walter 1, J M Burke 1
PMCID: PMC1370136  PMID: 11421363

Abstract

The hairpin ribozyme is a short endonucleolytic RNA motif isolated from a family of related plant virus satellite RNAs. It consists of two independently folding domains, each comprising two Watson-Crick helices flanking a conserved internal loop. The domains need to physically interact (dock) for catalysis of site-specific cleavage and ligation reactions. Using tapping-mode atomic force microscopy in aqueous buffer solution, we were able to produce high quality images of individual hairpin ribozyme molecules with extended terminal helices. Three RNA constructs with either the essential cleavage site guanosine or a detrimental adenosine substitution and with or without a 6-nt insertion to confer flexibility to the interdomain hinge show structural differences that correlate with their ability to form the active docked conformation. The observed contour lengths and shapes are consistent with previous bulk-solution measurements of the transient electric dichroism decays for the same RNA constructs. The active docked construct appears as an asymmetrically docked conformation that might be an indication of a more complicated docking event than a simple collapse around the interdomain hinge.

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Selected References

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