Nucleic Acids Research, 2003, Vol. 31, No. 3 988-998
© 2003 Oxford University Press
A Mini-RNA containing the tetraloop, wobble-pair and loop E motifs of the central conserved region of potato spindle tuber viroid is processed into a minicircle
Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
*To whom correspondence should be addressed. Tel: +49 211 811 4840; Fax: +49 211 811 5167; Email: riesner{at}biophys.uni-duesseldorf.de
Present addresses:
O. Schrader, Henkel KGaA, Henkelstrasse 67, D-40191 Düsseldorf, Germany
T. Baumstark, University of the Sciences in Philadelphia, Department of Biological Sciences, 600 South 43rd Street, Philadelphia, PA 19104, USA
A Mini-RNA from potato spindle tuber viroid (PSTVd) was constructed specifically for cleavage and ligation to circles in vitro. It contains the C-domain with the so-called central conserved region (CCR) of PSTVd with a 17 nt duplication in the upper strand and hairpin structures at the left and rights ends of the secondary structure. The CCR was previously shown to be essential for processing of in vitro transcripts. When folded under conditions which favor formation of a kinetically controlled conformation and incubated in a potato nuclear extract, the Mini-RNA is cleaved correctly at the 5'- and the 3'-end and ligated to a circle. Thus, the CCR obviously contains all structural and functional requirements for correct processing and therefore may be regarded as ‘processing domain’ of PSTVd. Using the Mini-RNA as a model substrate, the structural and functional relevance of its conserved non-canonical motifs GAAA tetraloop, loop E and G:U wobble base pair were studied by mutational analysis. It was found that (i) the conserved GAAA tetraloop is essential for processing by favoring the kinetically controlled conformation, (ii) a G:U wobble base pair at the 5'-cleavage site contributes to its correct recognition and (iii) an unpaired nucleotide in loop E, which is different from the corresponding nucleotide in the conserved loop E motif, is essential for ligation of the 5'- with the 3'-end. Hence all three structural motifs are functional elements for processing in a potato nuclear extract.
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