skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structural basis for activation of fluorogenic dyes by an RNA aptamer lacking a G-quadruplex motif

Journal Article · · Nature Communications

The DIR2s RNA aptamer, a second-generation, in-vitro selected binder to dimethylindole red (DIR), activates the fluorescence of cyanine dyes, DIR and oxazole thiazole blue (OTB), allowing detection of two well-resolved emission colors. Using Fab BL3-6 and its cognate hairpin as a crystallization module, we solved the crystal structures of both the apo and OTB-SO3 bound forms of DIR2s at 2.0 Å and 1.8 Å resolution, respectively. DIR2s adopts a compact, tuning fork-like architecture comprised of a helix and two short stem-loops oriented in parallel to create the ligand binding site through tertiary interactions. The OTB-SO3 fluorophore binds in a planar conformation to a claw-like structure formed by a purine base-triple, which provides a stacking platform for OTB-SO3, and an unpaired nucleotide, which partially caps the binding site from the top. The absence of a G-quartet or base tetrad makes the DIR2s aptamer unique among fluorogenic RNAs with known 3D structure.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231
OSTI ID:
1481292
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

References (62)

Fluorophore-binding RNA aptamers and their applications: Fluorophore-binding RNA aptamers journal August 2016
Laser-mediated, site-specific inactivation of RNA transcripts journal May 1999
Synthesis of New Fluorogenic Cyanine Dyes and Incorporation into RNA Fluoromodules journal April 2008
RNA Fluorescence with Light-Up Aptamers journal June 2016
RNA aptamers that bind flavin and nicotinamide redox cofactors journal February 1995
Isolation of RNA Aptamers for Biological Cofactors by In Vitro Selection journal June 1994
Contact-Mediated Quenching for RNA Imaging in Bacteria with a Fluorophore-Binding Aptamer journal October 2013
SRB-2: a promiscuous rainbow aptamer for live-cell RNA imaging journal June 2018
Transcription monitoring using fused RNA with a dye-binding light-up aptamer as a tag: a blue fluorescent RNA journal January 2008
Small-molecule fluorescent probes for specific RNA targets journal January 2011
Live-Cell Imaging of Endogenous mRNAs with a Small Molecule journal December 2014
RNA Mimics of Green Fluorescent Protein journal July 2011
Imaging RNA polymerase III transcription using a photostable RNA–fluorophore complex journal September 2017
A superfolding Spinach2 reveals the dynamic nature of trinucleotide repeat–containing RNA journal October 2013
Broccoli: Rapid Selection of an RNA Mimic of Green Fluorescent Protein by Fluorescence-Based Selection and Directed Evolution journal November 2014
RNA Mango Aptamer-Fluorophore: A Bright, High-Affinity Complex for RNA Labeling and Tracking journal August 2014
Fluorogenic RNA Mango aptamers for imaging small non-coding RNAs in mammalian cells journal February 2018
Tandem Spinach Array for mRNA Imaging in Living Bacterial Cells journal November 2015
RNA Signal Amplifier Circuit with Integrated Fluorescence Output journal September 2014
Green fluorescent protein as a marker for gene expression journal February 1994
Imaging metabolite dynamics in living cells using a Spinach-based riboswitch journal May 2015
RNA-Based Fluorescent Biosensors for Live Cell Imaging of Second Messengers Cyclic di-GMP and Cyclic AMP-GMP journal March 2013
Fluorescence Imaging of Cellular Metabolites with RNA journal March 2012
Imaging bacterial protein expression using genetically encoded RNA sensors journal July 2013
A Spinach molecular beacon triggered by strand displacement journal June 2014
Understanding the Photophysics of the Spinach–DFHBI RNA Aptamer–Fluorogen Complex To Improve Live-Cell RNA Imaging journal December 2013
Photochemical properties of Spinach and its use in selective imaging journal January 2013
Quadruplex DNA: sequence, topology and structure journal September 2006
G-quadruplexes in RNA biology: G-quadruplexes in RNA biology journal April 2012
A G-quadruplex–containing RNA activates fluorescence in a GFP-like fluorophore journal June 2014
Structural basis for activity of highly efficient RNA mimics of green fluorescent protein journal July 2014
A homodimer interface without base pairs in an RNA mimic of red fluorescent protein journal September 2017
Structural basis for high-affinity fluorophore binding and activation by RNA Mango journal May 2017
RNA G-quadruplexes are globally unfolded in eukaryotic cells and depleted in bacteria journal September 2016
A multicolor riboswitch-based platform for imaging of RNA in live mammalian cells journal July 2018
Fluoromodules Consisting of a Promiscuous RNA Aptamer and Red or Blue Fluorogenic Cyanine Dyes: Selection, Characterization, and Bioimaging journal June 2017
In vitro selection of RNA molecules that bind specific ligands journal August 1990
Systematic evolution of ligands by exponential enrichment: RNA ligands to bacteriophage T4 DNA polymerase journal August 1990
A portable RNA sequence whose recognition by a synthetic antibody facilitates structural determination journal December 2010
A class I ligase ribozyme with reduced Mg2+ dependence: Selection, sequence analysis, and identification of functional tertiary interactions journal November 2009
Structurally complex and highly active RNA ligases derived from random RNA sequences journal July 1995
The non-Watson-Crick base pairs and their associated isostericity matrices journal August 2002
A common motif organizes the structure of multi-helix loops in 16 S and 23 S ribosomal RNAs journal October 1998
Structural changes of an abasic site in duplex DNA affect noncovalent binding of the spin label ç journal December 2011
Recognition of Planar and Nonplanar Ligands in the Malachite Green-RNA Aptamer Complex journal December 2003
2.8 Å crystal structure of the malachite green aptamer 1 1Edited by J. A. Doudna journal August 2000
A Simple and Efficient Method to Transcribe RNAs with Reduced 3′ Heterogeneity journal March 2001
PRODRG : a tool for high-throughput crystallography of protein–ligand complexes journal July 2004
Inference of Macromolecular Assemblies from Crystalline State journal September 2007
Automated acquisition and analysis of small angle X-ray scattering data
  • Franke, Daniel; Kikhney, Alexey G.; Svergun, Dmitri I.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 689 https://doi.org/10.1016/j.nima.2012.06.008
journal October 2012
Crystal structure of the Varkud satellite ribozyme journal September 2015
ATSAS 2.1 – towards automated and web-supported small-angle scattering data analysis journal April 2007
Accurate SAXS Profile Computation and its Assessment by Contrast Variation Experiments journal August 2013
PRIMUS: a Windows PC-based system for small-angle scattering data analysis journal September 2003
Contact-Mediated Quenching for RNA Imaging in Bacteria with a Fluorophore-Binding Aptamer journal October 2013
Isolation and characterization of fluorophore-binding RNA aptamers journal November 1998
Receptor binding and priming of the spike protein of SARS-CoV-2 for membrane fusion journal September 2020
Blue fluorescent dye-protein complexes based on fluorogenic cyanine dyes and single chain antibody fragments journal January 2011
Spinach RNA aptamer detects lead( ii ) with high selectivity journal January 2015
Dual-colour imaging of RNAs using quencher- and fluorophore-binding aptamers journal July 2015
Phaser crystallographic software journal July 2007
ATSAS 2.8 : a comprehensive data analysis suite for small-angle scattering from macromolecular solutions journal June 2017