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- PDB-21ak: Cryo-EM structure of the E. coli ArnA hexamer -

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Basic information

Entry
Database: PDB / ID: 21ak
TitleCryo-EM structure of the E. coli ArnA hexamer
ComponentsBifunctional polymyxin resistance protein ArnA
KeywordsTRANSFERASE / Bifunctional enzyme / polymyxin resistance protein / antimicrobial resistance protein
Function / homology
Function and homology information


UDP-4-deoxy-4-formamido-beta-L-arabinopyranose biosynthetic process / UDP-glucuronate dehydrogenase activity / UDP-4-amino-4-deoxy-L-arabinose formyltransferase activity / UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating) / UDP-4-amino-4-deoxy-L-arabinose formyltransferase / UDP-D-xylose biosynthetic process / UDP-glucuronate decarboxylase activity / lipopolysaccharide biosynthetic process / lipid A biosynthetic process / NAD+ binding ...UDP-4-deoxy-4-formamido-beta-L-arabinopyranose biosynthetic process / UDP-glucuronate dehydrogenase activity / UDP-4-amino-4-deoxy-L-arabinose formyltransferase activity / UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating) / UDP-4-amino-4-deoxy-L-arabinose formyltransferase / UDP-D-xylose biosynthetic process / UDP-glucuronate decarboxylase activity / lipopolysaccharide biosynthetic process / lipid A biosynthetic process / NAD+ binding / response to antibiotic / protein-containing complex / membrane / identical protein binding
Similarity search - Function
Bifunctional polymyxin resistance protein, ArnA / Bifunctional polymyxin resistance protein ArnA-like, extended (e) SDRs / : / Formyl transferase, C-terminal / Formyl transferase, C-terminal domain / Formyl transferase-like, C-terminal domain superfamily / Formyl transferase, N-terminal / Formyl transferase / Formyl transferase, N-terminal domain superfamily / NAD-dependent epimerase/dehydratase ...Bifunctional polymyxin resistance protein, ArnA / Bifunctional polymyxin resistance protein ArnA-like, extended (e) SDRs / : / Formyl transferase, C-terminal / Formyl transferase, C-terminal domain / Formyl transferase-like, C-terminal domain superfamily / Formyl transferase, N-terminal / Formyl transferase / Formyl transferase, N-terminal domain superfamily / NAD-dependent epimerase/dehydratase / NAD dependent epimerase/dehydratase family / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
Bifunctional polymyxin resistance protein ArnA
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.23 Å
AuthorsJiang, X. / Kikkawa, M.
Funding support Japan, 4items
OrganizationGrant numberCountry
Japan Science and TechnologyJPMJER2202 Japan
Japan Society for the Promotion of Science (JSPS)JP21H05247 Japan
Japan Society for the Promotion of Science (JSPS)JP24KF0141 Japan
Japan Society for the Promotion of Science (JSPS)JP24K18106 Japan
CitationJournal: Acta Crystallogr.,Sect.D / Year: 2026
Title: Cryo-EM reveals ArnA contamination during purification of a ciliary protein complex
Authors: Jiang, X. / Kikkawa, M.
History
DepositionDec 4, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 25, 2026Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Mar 25, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Bifunctional polymyxin resistance protein ArnA
B: Bifunctional polymyxin resistance protein ArnA
C: Bifunctional polymyxin resistance protein ArnA
D: Bifunctional polymyxin resistance protein ArnA
E: Bifunctional polymyxin resistance protein ArnA
F: Bifunctional polymyxin resistance protein ArnA
G: Bifunctional polymyxin resistance protein ArnA
H: Bifunctional polymyxin resistance protein ArnA
I: Bifunctional polymyxin resistance protein ArnA
J: Bifunctional polymyxin resistance protein ArnA
K: Bifunctional polymyxin resistance protein ArnA
L: Bifunctional polymyxin resistance protein ArnA


Theoretical massNumber of molelcules
Total (without water)892,62912
Polymers892,62912
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: Protein
Bifunctional polymyxin resistance protein ArnA / Polymyxin resistance protein PmrI


Mass: 74385.773 Da / Num. of mol.: 12
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: arnA, pmrI, yfbG, b2255, JW2249 / Production host: Escherichia coli (E. coli)
References: UniProt: P77398, UDP-4-amino-4-deoxy-L-arabinose formyltransferase, UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating)
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: Hexameric complex of ArnA / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.446 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21 / Plasmid: pETDuet-1 for KIF3A/B, pET21b for KAP3
Buffer solutionpH: 8
SpecimenConc.: 0.01 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 279 K

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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 magnification: 105000 X / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: BASIC
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 61.6 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3000
EM imaging opticsEnergyfilter slit width: 20 eV
Image scansWidth: 5760 / Height: 4092

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Processing

EM software
IDNameVersionCategory
1cryoSPARCv4.7.1particle selection
3cryoSPARCv4.7.1CTF correction
6PHENIXmodel fitting
8EPUimage acquisition
9cryoSPARCv4.7.1initial Euler assignment
10cryoSPARCv4.7.1final Euler assignment
11cryoSPARCclassification
12cryoSPARCv4.7.13D reconstruction
13PHENIXmodel refinement
14Cootmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1811803
SymmetryPoint symmetry: D3 (2x3 fold dihedral)
3D reconstructionResolution: 3.23 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 67122 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: BACKBONE TRACE / Space: REAL
Atomic model buildingPDB-ID: 9V5H

9v5h


Accession code: 9V5H / Source name: PDB / Type: experimental model

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