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. 1988 Dec 20;7(13):4063–4074. doi: 10.1002/j.1460-2075.1988.tb03300.x

The 7S RNA from tomato leaf tissue resembles a signal recognition particle RNA and exhibits a remarkable sequence complementarity to viroids.

B Haas 1, A Klanner 1, K Ramm 1, H L Sänger 1
PMCID: PMC455115  PMID: 2468486

Abstract

From tomato leaf tissue we sequenced and characterized a 7S RNA which consists of 299 nucleotides with either two or three additional uridine nucleotides at its 3'-terminus. About 56% of the nucleotides of this higher plant 7S RNA are in nearly identical positions as those of the human 7SL RNA which is an integral component of the signal recognition particle (SRP) that mediates protein translocation. Computer modelling and digestion studies with nucleases led to a secondary structure model for tomato 7S RNA, the overall shape of which is very similar to that of the human 7SL (SRP) RNA. This structural similarity strongly suggests that tomato 7S RNA is actually an SRP RNA and an integral part of the plant SRP, and that the protein translocation system of higher plants is very similar to the one operating in mammalian cells. Tomato SRP RNA contains a stretch of 36-53 nucleotides which exhibit a high degree of sequence complementarity to five viroid 'species' that cause disease in tomato. In the case of potato spindle tuber viroid and citrus exocortis viroid this complementarity spans the lower strand of the region, the nucleotides of which are known to modulate virulence. This extensive sequence complementarity could lead to a thermodynamically favoured base-pairing in vivo which renders the tomato SRP RNA a possible host target with which viroids could interact and thus incite disease.

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