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Title: Structural Basis for Molecular Discrimination by a 3',3'-cGAMP Sensing Riboswitch

Journal Article · · Cell Reports
 [1];  [2];  [2];  [3];  [4];  [2];  [1]
  1. Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY (United States)
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry and Molecular and Cell Biology
  3. Argonne National Lab., IL (US). Advanced Photon Source
  4. State Univ. of New Jersey, Piscataway, NJ (United States). Dept. of Chemistry and Chemical Biology

Cyclic dinucleotides are second messengers that target the adaptor STING and stimulate the innate immune response in mammals. Besides protein receptors, there are bacterial riboswitches that selectively recognize cyclic dinucleotides. We recently discovered a natural riboswitch that targets 3',3'-cGAMP, which is distinguished from the endogenous mammalian signal 2',3'-cGAMP by its backbone connectivity. Here, we report on structures of the aptamer domain of the 3',3'-cGAMP riboswitch from Geobacter in the 3',3'-cGAMP and c-di-GMP bound states. The riboswitch adopts a tuning forklike architecture with a junctional ligand-binding pocket and different orientations of the arms are correlated with the identity of the bound cyclic dinucleotide. Subsequent biochemical experiments revealed that specificity of ligand recognition can be affected by point mutations outside of the binding pocket, which has implications for both the assignment and reengineering of riboswitches in this structural class.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1178128
Journal Information:
Cell Reports, Vol. 11, Issue 1; ISSN 2211-1247
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (19)

Direct activation of a phospholipase by cyclic GMP-AMP in El Tor Vibrio cholerae journal June 2018
Enzymatic synthesis of cyclic dinucleotide analogs by a promiscuous cyclic-AMP-GMP synthetase and analysis of cyclic dinucleotide responsive riboswitches journal March 2018
Structures of two aptamers with differing ligand specificity reveal ruggedness in the functional landscape of RNA journal June 2018
Hybrid promiscuous (Hypr) GGDEF enzymes produce cyclic AMP-GMP (3′, 3′-cGAMP) journal February 2016
Adenine protonation enables cyclic-di-GMP binding to cyclic-GAMP sensing riboswitches journal July 2018
Transcriptomic analyses reveal groups of co-expressed, syntenic lncRNAs in four species of the genus Caenorhabditis posted_content September 2018
Next-generation RNA-based fluorescent biosensors enable anaerobic detection of cyclic di-GMP journal July 2016
Nucleotide binding by the widespread high-affinity cyclic di-GMP receptor MshEN domain journal August 2016
Structure of HIV TAR in complex with a Lab-Evolved RRM provides insight into duplex RNA recognition and synthesis of a constrained peptide that impairs transcription journal June 2018
Computational and NMR spectroscopy insights into the conformation of cyclic di-nucleotides journal November 2017
Structural Studies of the 3′,3′-cGAMP Riboswitch Induced by Cognate and Noncognate Ligands Using Molecular Dynamics Simulation journal November 2018
Global RNA Fold and Molecular Recognition for a pfl Riboswitch Bound to ZMP, a Master Regulator of One-Carbon Metabolism journal August 2015
Recognition of the bacterial alarmone ZMP through long-distance association of two RNA subdomains journal August 2015
ykkC riboswitches employ an add-on helix to adjust specificity for polyanionic ligands journal August 2018
Spreading of Tau Pathology in Sporadic Alzheimer’s Disease Along Cortico-cortical Top-Down Connections journal June 2018
Histone acetylation promotes long-lasting defense responses and longevity following early life heat stress journal April 2019
Memory Elicited by Courtship Conditioning Requires Mushroom Body Neuronal Subsets Similar to Those Utilized in Appetitive Memory journal October 2016
Pool size estimations for dense‐core vesicles in mammalian CNS neurons journal September 2018
The World of Cyclic Dinucleotides in Bacterial Behavior preprint January 2020

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