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Carbonell, A.; Flores, R.; Gago, S.; Hammerhead Ribozymes Against Virus and Viroid RNAs (Erdmann, V. A. & Barciszewski, J., eds.). RNA Technologies 411-427, (2012) ISBN: 978-3-642-27426-8 DOI: 10.1007/978-3-642-27426-8_16
The hammerhead ribozyme, a small catalytic motif that promotes self-cleavage of the RNAs in which it is found naturally embedded, can be manipulated to recognize and cleave specifically in trans other RNAs in the presence of Mg2+. To be really effective, hammerheads need to operate at the low concentration of Mg2+ existing in vivo. Evidence has been gathered along the last years showing that tertiary stabilizing motifs (TSMs), particularly interactions between peripheral loops, are critical for the catalytic activity of hammerheads at physiological levels of Mg2+. These TSMs, in two alternative formats, have been incorporated into a new generation of more efficient trans-cleaving hammerheads, some of which are active in vitro and in planta when targeted against the highly structured RNA of a viroid (a small plant pathogen). This strategy has potential to confer protection against other RNA replicons, like RNA viruses infecting plants and animals.
Kramell, R.; Miersch, O.; Schneider, G.; Wasternack, C.; Liquid chromatography of jasmonic acid amine conjugates Chromatographia 49, 42-46, (1999) DOI: 10.1007/BF02467185
Racemic jasmonic acid (3R,7R/3S,7S)-(±)-JA) was chemically conjugated with different biogenic amines originating from aliphatic and aromatic α-amino acids by decarboxylation. The resulting isomeric compounds were subjected to reversed-phase high-performance liquid chromatography (HPLC) and to HPLC on the chiral stationary phases Chiralpak AS and Nucleodex β-PM. Under reversed-phase conditions, all the homologous amine derivatives tested could be separated from each other except the JA-conjugates containing 2-phenyl-ethylamine and 3-methylbutylamine. On both chiral supports the (3R,7R)-(−)-JA conjugates eluted earlier than those of the enantiomeric counterpart (3S,7S)-(+)-JA. On Chiralpak AS all the isomers studied could be separated to baseline with a mobile phase containingn-hexane and 2-propanol. The calculated resolution factors were between 1.80 and 4.17. The pairs of isomers were also chromatographed on the cyclodextrin stationary phase Nucleodex β-PM with methanol-triethylammonium acetate buffer as mobile phase. Under these conditions resolution factors were between 0.74 and 1.29. The individual isomers were chiroptically characterized by measurement of their circular dichroism.