A bacterial riboswitch class for the thiamin precursor HMP-PP employs a terminator-embedded aptamer.

Abstract:

:We recently implemented a bioinformatics pipeline that can uncover novel, but rare, riboswitch candidates as well as other noncoding RNA structures in bacteria. A prominent candidate revealed by our initial search efforts was called the 'thiS motif' because of its frequent association with a gene coding for the ThiS protein, which delivers sulfur to form the thiazole moiety of the thiamin precursor HET-P. In the current report, we describe biochemical and genetic data demonstrating that thiS motif RNAs function as sensors of the thiamin precursor HMP-PP, which is fused with HET-P ultimately to form the final active coenzyme thiamin pyrophosphate (TPP). HMP-PP riboswitches exhibit a distinctive architecture wherein an unusually small ligand-sensing aptamer is almost entirely embedded within an otherwise classic intrinsic transcription terminator stem. This arrangement yields remarkably compact genetic switches that bacteria use to tune the levels of thiamin precursors during the biosynthesis of this universally distributed coenzyme.

journal_name

Elife

journal_title

eLife

authors

Atilho RM,Mirihana Arachchilage G,Greenlee EB,Knecht KM,Breaker RR

doi

10.7554/eLife.45210

subject

Has Abstract

pub_date

2019-04-05 00:00:00

issn

2050-084X

pii

45210

journal_volume

8

pub_type

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