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Dufour, D.; De la Peña, M.; Gago, S.; Flores, R.; Gallego, J.; Structure–function analysis of the ribozymes of chrysanthemum chlorotic mottle viroid: a loop–loop interaction motif conserved in most natural hammerheads Nucleic Acids Res. 37, 368-381, (2009) DOI: 10.1093/nar/gkn918
Loop–loop tertiary interactions play a key role in the folding and catalytic activity of natural hammerhead ribozymes. Using a combination of NMR spectroscopy, site-directed mutagenesis and kinetic and infectivity analyses, we have examined the structure and function of loops 1 and 2 of the (+) and (–) hammerheads of chrysanthemum chlorotic mottle viroid RNA. In both hammerheads, loop 1 is a heptanucleotide hairpin loop containing an exposed U at its 5′ side and an extrahelical U at its 3′-side critical for the catalytic activity of the ribozyme in vitro and for viroid infectivity in vivo , whereas loop 2 has a key opened A at its 3′-side. These structural features promote a specific loop–loop interaction motif across the major groove. The essential features of this tertiary structure element, base pairing between the 5′ U of loop 1 and the 3′ A of loop 2, and interaction of the extrahelical pyrimidine of loop 1 with loop 2, are likely shared by a significant fraction of natural hammerheads.
