BIOL 2131 Lecture Notes - Lecture 5: Potato Spindle Tuber Viroid, Viroid, Prnp
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14 Mar 2016
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Viroids: pstv rna, no genes, very pathogenic piece of rna, 359 base pairs. There are a number of different viroids. All viruses have some genes: they have genes that they need to replicate. Viruses need to infect host cells: they have a genome. Viroids were isolated several decades ago: took a while. Viroids: unique type of plant infectious agent that does not contain any protein associated with it (short ssrna with high intramolecular complementarity: 250-530 bases long) Viroids are very short single stranded rna molecules: no protein associated with it, does not come encapsulated in protein like viruses do. The short ssrna molecule has lots of intramolecular complementarity within it: vast majority of it is actually double stranded. It is a single strand but there is so much intramolecular complementarity that it is like it is double stranded. Has to get into a plant somehow: in through a cut, or some injury.
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