Abstract:
:In response to intracellular signals in Gram--negative bacteria, translational riboswitches--commonly embedded in messenger RNAs (mRNAs)-regulate gene expression through inhibition of translation initiation. It is generally thought that this regulation originates from occlusion of the Shine-Dalgarno (SD) sequence upon ligand binding; however, little direct evidence exists. Here we develop Single Molecule Kinetic Analysis of RNA Transient Structure (SiM-KARTS) to investigate the ligand-dependent accessibility of the SD sequence of an mRNA hosting the 7-aminomethyl-7-deazaguanine (preQ1)-sensing riboswitch. Spike train analysis reveals that individual mRNA molecules alternate between two conformational states, distinguished by 'bursts' of probe binding associated with increased SD sequence accessibility. Addition of preQ1 decreases the lifetime of the SD's high-accessibility (bursting) state and prolongs the time between bursts. In addition, ligand-jump experiments reveal imperfect riboswitching of single mRNA molecules. Such complex ligand sensing by individual mRNA molecules rationalizes the nuanced ligand response observed during bulk mRNA translation.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Rinaldi AJ,Lund PE,Blanco MR,Walter NGdoi
10.1038/ncomms9976subject
Has Abstractpub_date
2016-01-19 00:00:00pages
8976issn
2041-1723pii
ncomms9976journal_volume
7pub_type
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