Journal
CHEMISTRY & BIOLOGY
Volume 21, Issue 5, Pages 591-595Publisher
CELL PRESS
DOI: 10.1016/j.chembiol.2014.03.007
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Funding
- National Institute for General Medical Sciences, NIH
- US Department of Energy
- NIH [GM098662]
- BBSRC of the UK
- NIH-Oxford/Cambridge Research Scholars program
- intramural program of the National Heart, Lung and Blood Institute, NIH
- Biotechnology and Biological Sciences Research Council [BB/D005817/1] Funding Source: researchfish
- BBSRC [BB/D005817/1] Funding Source: UKRI
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Thiamine pyrophosphate (TPP) riboswitches regulate essential genes in bacteria by changing conformation upon binding intracellular TPP. Previous studies using fragment-based approaches identified small molecule fragments that bind this gene-regulatory mRNA domain. Crystallographic studies now show that, despite having micromolar K(d)s, four different fragments bind the TPP riboswitch site-specifically, occupying the pocket that recognizes the aminopyrimidine of TPP. Unexpectedly, the unoccupied site that would recognize the pyrophosphate of TPP rearranges into a structure distinct from that of the cognate complex. This idiosyncratic fragment-induced conformation, also characterized by small-angle X-ray scattering and chemical probing, represents a possible mechanism for adventitious ligand discrimination by the riboswitch, and suggests that off-pathway conformations of RNAs can be targeted for drug development. Our structures, together with previous screening studies, demonstrate the feasibility of fragment-based drug discovery against RNA targets.
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