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The separation between the 5'-3' ends in long RNA molecules is short and nearly constant.

Abstract：

:RNA molecules play different roles in coding, decoding and gene expression regulation. Such roles are often associated to the RNA secondary or tertiary structures. The folding dynamics lead to multiple secondary structures of long RNA molecules, since an RNA molecule might fold into multiple distinct native states. Despite an ensemble of different structures, it has been theoretically proposed that the separation between the 5' and 3' ends of long single-stranded RNA molecules (ssRNA) remains constant, independent of their base content and length. Here, we present the first experimental measurements of the end-to-end separation in long ssRNA molecules. To determine this separation, we use single molecule Fluorescence Resonance Energy Transfer of fluorescently end-labeled ssRNA molecules ranging from 500 to 5500 nucleotides in length, obtained from two viruses and a fungus. We found that the end-to-end separation is indeed short, within 5-9 nm. It is remarkable that the separation of the ends of all RNA molecules studied remains small and similar, despite the origin, length and differences in their secondary structure. This implies that the ssRNA molecules are 'effectively circularized' something that might be a general feature of RNAs, and could result in fine-tuning for translation and gene expression regulation.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Leija-Martínez N,Casas-Flores S,Cadena-Nava RD,Roca JA,Mendez-Cabañas JA,Gomez E,Ruiz-Garcia J

doi

10.1093/nar/gku1249

subject

Has Abstract

pub_date

2014-12-16 00:00:00

pages

13963-8

issue

22

eissn

0305-1048

issn

1362-4962

pii

gku1249

journal_volume

42

pub_type

杂志文章

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