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- PDB-9e73: Cryo-EM structure of RaiA RNA from Clostridium acetobutylicum -

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Basic information

Entry
Database: PDB / ID: 9.0E+73
TitleCryo-EM structure of RaiA RNA from Clostridium acetobutylicum
ComponentsRNA (204-MER)
KeywordsRNA / Non-coding RNA / cryo-EM / raiA motif RNA / KhpA / KhpB / ModT
Function / homology: / RNA / RNA (> 10) / RNA (> 100)
Function and homology information
Biological speciesClostridium acetobutylicum ATCC 824 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsHe, Y. / Zhong, J. / Yang, Y. / Gunsalus, R.P. / Zhou, Z.H. / Feigon, J.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM131901 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM071940 United States
CitationJournal: Nucleic Acids Res / Year: 2026
Title: Cryo-EM structures reveal a conserved architecture for raiA noncoding RNA.
Authors: Yao He / Janet Zhong / Yuan Yang / Robert P Gunsalus / Z Hong Zhou / Juli Feigon /
Abstract: RaiA motif RNA is a family of bacterial noncoding RNAs (ncRNAs) found in over 2700 bacterial species. Although its cellular abundance is comparable to that of rRNAs and tRNAs in the human ...RaiA motif RNA is a family of bacterial noncoding RNAs (ncRNAs) found in over 2700 bacterial species. Although its cellular abundance is comparable to that of rRNAs and tRNAs in the human pathogen Clostridioides difficile and its knockout results in pronounced phenotypes, its function remains unknown. Sequence conservation analysis predicted a consensus secondary structure of raiA motif RNA with several major subtypes that differ in the number and composition of stems. Here, we present cryogenic electron microscopy (cryo-EM) structures of three raiA motif RNAs from three bacterial species, one from each subtype, at 3.0-3.5 Å resolution, as well as a minimal variant with 113 nucleotides at ∼8 Å resolution. Comparison of the structures reveals a conserved architecture, with a compact core comprising stems P3a-P3b bent by an asymmetric internal loop, P4, pseudoknot 1 (PK1), and PK2 with unusual tertiary interactions. While most of the peripheral stems vary, the length, structure, and tertiary interactions of the closing P1 are remarkably conserved, suggesting an essential role. Our study defines the conserved structural framework of raiA motif RNAs and provides a foundation for structure-based functional studies. This work also highlights the utility of cryo-EM for de novo structure determination of ncRNAs.
History
DepositionOct 31, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 5, 2025Provider: repository / Type: Initial release
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Revision 2.0Dec 3, 2025Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Refinement description / Structure summary
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: RNA (204-MER)


Theoretical massNumber of molelcules
Total (without water)66,1041
Polymers66,1041
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: RNA chain RNA (204-MER)


Mass: 66104.234 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Clostridium acetobutylicum ATCC 824 (bacteria)
References: GenBank: 25168256
Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: RaiA RNA from Clostridium acetobutylicum / Type: COMPLEX / Entity ID: all / Source: NATURAL
Source (natural)Organism: Clostridium acetobutylicum ATCC 824 (bacteria)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE-PROPANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1Topazparticle selection
8PHENIXmodel refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 439963 / Symmetry type: POINT
RefinementHighest resolution: 3 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0024907
ELECTRON MICROSCOPYf_angle_d0.5447652
ELECTRON MICROSCOPYf_dihedral_angle_d22.2822941
ELECTRON MICROSCOPYf_chiral_restr0.0331020
ELECTRON MICROSCOPYf_plane_restr0.005204

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