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- PDB-9mqt: CryoEM Structure of the Candida albicans Group I Intron-Compound ... -

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Basic information

Entry
Database: PDB / ID: 9mqt
TitleCryoEM Structure of the Candida albicans Group I Intron-Compound 11 Complex under Magnesium Condition
ComponentsRNA (332-MER)
KeywordsRNA / Intron / Group I / Splicing
Function / homology: / : / : / RNA / RNA (> 10) / RNA (> 100)
Function and homology information
Biological speciesCandida albicans (yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.43 Å
AuthorsChung, K. / Xu, L. / Liu, T. / Pyle, A.
Funding support United States, 1items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: Molecular insights into de novo small-molecule recognition by an intron RNA structure.
Authors: Tianshuo Liu / Ling Xu / Kevin Chung / Luke J Sisto / Jimin Hwang / Chengxin Zhang / Michael C Van Zandt / Anna Marie Pyle /
Abstract: Despite the promise of vastly expanding the druggable genome, rational design of RNA-targeting ligands remains challenging as it requires the rapid identification of hits and visualization of the ...Despite the promise of vastly expanding the druggable genome, rational design of RNA-targeting ligands remains challenging as it requires the rapid identification of hits and visualization of the resulting cocomplexes for guiding optimization. Here, we leveraged high-throughput screening, medicinal chemistry, and structural biology to identify a de novo splicing inhibitor against a large and highly folded fungal group I intron. High-resolution cryoEM structures of the intron in different liganded states not only reveal molecular interactions that rationalize experimental structure-activity relationship but also shed light on a unique strategy whereby RNA-associated metal ions and RNA conformation exhibit exceptional plasticity in response to small-molecule binding. This study reveals general principles that govern RNA-ligand recognition, the interplay between chemical bonding specificity, and dynamic responses within an RNA target.
History
DepositionJan 6, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 30, 2025Provider: repository / Type: Initial release
Revision 1.0Apr 30, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Apr 30, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Revision 1.1May 28, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: RNA (332-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)107,0949
Polymers106,7271
Non-polymers3678
Water46826
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: RNA chain RNA (332-MER)


Mass: 106727.062 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Candida albicans (yeast) / Production host: Escherichia coli (E. coli) / References: GenBank: 391224033
#2: Chemical ChemComp-A1BNU / N~4~-(2-aminoethyl)-N~4~-methylpyrimidine-2,4-diamine


Mass: 167.212 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C7H13N5 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: K / Feature type: SUBJECT OF INVESTIGATION
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 26 / Source method: isolated from a natural source / Formula: H2O
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: Complex of group I intron with inhibitor substrate / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Candida albicans (yeast)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5 / Details: 50 mM K-HEPES pH 7.5 and 10 mM MgCl2
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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: 2000 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.43 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 612762 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0086302
ELECTRON MICROSCOPYf_angle_d1.1569800
ELECTRON MICROSCOPYf_dihedral_angle_d18.0633158
ELECTRON MICROSCOPYf_chiral_restr0.0581320
ELECTRON MICROSCOPYf_plane_restr0.008266

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