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Publikation

Flores, R.; Delgado, S.; Gas, M.-E.; Carbonell, A.; Molina, D.; Gago, S.; De la Peña, M.; Viroids: the minimal non-coding RNAs with autonomous replication FEBS Lett. 567, 42-48, (2004) DOI: 10.1016/j.febslet.2004.03.118

Viroids are small (246–401 nucleotides), non‐coding, circular RNAs able to replicate autonomously in certain plants. Viroids are classified into the families Pospiviroidae and Avsunviroidae , whose members replicate in the nucleus and chloroplast, respectively. Replication occurs by an RNA‐based rolling‐circle mechanism in three steps: (1) synthesis of longer‐than‐unit strands catalyzed by host DNA‐dependent RNA polymerases forced to transcribe RNA templates, (2) processing to unit‐length, which in family Avsunviroidae is mediated by hammerhead ribozymes, and (3) circularization either through an RNA ligase or autocatalytically. Disease induction might result from the accumulation of viroid‐specific small interfering RNAs that, via RNA silencing, could interfere with normal developmental pathways.

Publikation

Churin, J.; Hause, B.; Feussner, I.; Maucher, H. P.; Feussner, K.; Börner, T.; Wasternack, C.; Cloning and expression of a new cDNA from monocotyledonous plants coding for a diadenosine 5′,5′′′-P1,P4-tetraphosphate hydrolase from barley (Hordeum vulgare) FEBS Lett. 431, 481-485, (1998) DOI: 10.1016/S0014-5793(98)00819-9

From a cDNA library generated from mRNA of white leaf tissues of the ribosome‐deficient mutant ‘albostrians' of barley (Hordeum vulgare cv. Haisa) a cDNA was isolated carrying 54.2% identity to a recently published cDNA which codes for the diadenosine‐5′,5′′′‐P1,P4‐tetraphosphate (Ap4A) hydrolase of Lupinus angustifolius (Maksel et al. (1998) Biochem. J. 329, 313–319), and 69% identity to four partial peptide sequences of Ap4A hydrolase of tomato. Overexpression in Escherichia coli revealed a protein of about 19 kDa, which exhibited Ap4A hydrolase activity and cross‐reactivity with an antibody raised against a purified tomato Ap4A hydrolase (Feussner et al. (1996) Z. Naturforsch. 51c, 477–486). Expression studies showed an mRNA accumulation in all organs of a barley seedling. Possible functions of Ap4A hydrolase in plants will be discussed.