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- PDB-9g2l: Cryo-EM structure of IrtAB in inward-facing state in LMNG -

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Basic information

Entry
Database: PDB / ID: 9g2l
TitleCryo-EM structure of IrtAB in inward-facing state in LMNG
Components
  • Mycobactin import ATP-binding/permease protein IrtA
  • Mycobactin import ATP-binding/permease protein IrtB
KeywordsMEMBRANE PROTEIN / ABC transporter / type IV ABC importer siderophore / mycobactin / heterodimeric ABC transporter
Function / homology
Function and homology information


Translocases; Catalysing the translocation of inorganic cations; Linked to the hydrolysis of a nucleoside triphosphate / ATPase-coupled lipid transmembrane transporter activity / ABC-type transporter activity / oxidoreductase activity / ATP hydrolysis activity / ATP binding / plasma membrane
Similarity search - Function
Siderophore-interacting protein, C-terminal domain / FAD-binding 9, siderophore-interacting / Siderophore-interacting protein / Siderophore-interacting FAD-binding domain / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / FAD-binding domain, ferredoxin reductase-type ...Siderophore-interacting protein, C-terminal domain / FAD-binding 9, siderophore-interacting / Siderophore-interacting protein / Siderophore-interacting FAD-binding domain / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / FAD-binding domain, ferredoxin reductase-type / Ferredoxin-NADP reductase (FNR), nucleotide-binding domain / Ferredoxin reductase-type FAD binding domain profile. / Riboflavin synthase-like beta-barrel / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Mycobactin import ATP-binding/permease protein IrtA / Mycobactin import ATP-binding/permease protein IrtB
Similarity search - Component
Biological speciesMycolicibacterium thermoresistibile ATCC 19527 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.23 Å
AuthorsGonda, I. / Seeger, M.A.
Funding support Switzerland, European Union, 4items
OrganizationGrant numberCountry
University of ZurichFK-19-028 Switzerland
European Research Council (ERC)consolidator grant 772190European Union
Swiss National Science FoundationPP00P3_144823 Switzerland
Swiss National Science Foundation310030_188817 Switzerland
CitationJournal: Nat Commun / Year: 2025
Title: The mycobacterial ABC transporter IrtAB employs a membrane-facing crevice for siderophore-mediated iron uptake.
Authors: Imre Gonda / Simona Sorrentino / Laura Galazzo / Nicolas P Lichti / Fabian M Arnold / Ahmad R Mehdipour / Enrica Bordignon / Markus A Seeger /
Abstract: The mycobacterial ABC transporter IrtAB features an ABC exporter fold, yet it imports iron-charged siderophores called mycobactins. Here, we present extensive cryo-EM analyses and DEER measurements, ...The mycobacterial ABC transporter IrtAB features an ABC exporter fold, yet it imports iron-charged siderophores called mycobactins. Here, we present extensive cryo-EM analyses and DEER measurements, revealing that IrtAB alternates between an inward-facing and an outward-occluded conformation, but does not sample an outward-facing conformation. When IrtAB is locked in its outward-occluded conformation in nanodiscs, mycobactin is bound in the middle of the lipid bilayer at a membrane-facing crevice opening at the heterodimeric interface. Mutations introduced at the crevice abrogate mycobactin import and in corresponding structures, the crevice is collapsed. A conserved triple histidine motif coordinating a zinc ion is present below the mycobactin binding site. Substitution of these histidine residues with alanine results in a decoupled transporter, which hydrolyzes ATP, but lost its capacity to import mycobactins. Our data suggest that IrtAB imports mycobactin via a credit-card mechanism in a transport cycle that is coupled to the presence of zinc.
History
DepositionJul 11, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 18, 2024Provider: repository / Type: Initial release
Revision 1.1Feb 12, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.journal_abbrev / _citation.journal_id_ASTM ..._citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Mycobactin import ATP-binding/permease protein IrtA
B: Mycobactin import ATP-binding/permease protein IrtB
hetero molecules


Theoretical massNumber of molelcules
Total (without water)158,9903
Polymers158,9252
Non-polymers651
Water00
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: Protein Mycobactin import ATP-binding/permease protein IrtA


Mass: 97365.344 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycolicibacterium thermoresistibile ATCC 19527 (bacteria)
Gene: irtA, KEK_01485 / Production host: Escherichia coli MC1061 (bacteria)
References: UniProt: G7CBF5, Translocases; Catalysing the translocation of inorganic cations; Linked to the hydrolysis of a nucleoside triphosphate
#2: Protein Mycobactin import ATP-binding/permease protein IrtB


Mass: 61559.539 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: contains cleaved, C-terminal 3C enzyme recognition site
Source: (gene. exp.) Mycolicibacterium thermoresistibile ATCC 19527 (bacteria)
Gene: irtB, KEK_01490 / Production host: Escherichia coli MC1061 (bacteria)
References: UniProt: G7CBF6, Translocases; Catalysing the translocation of inorganic cations; Linked to the hydrolysis of a nucleoside triphosphate
#3: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
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: IrtAB / Type: COMPLEX / Details: wild-type, apo IrtAB in nanodisc / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.1589 MDa / Experimental value: NO
Source (natural)Organism: Mycolicibacterium thermoresistibile ATCC 19527 (bacteria)
Source (recombinant)Organism: Escherichia coli MC1061 (bacteria)
Buffer solutionpH: 7.5 / Details: 20mM Tris-HCl pH 7.5, 150mM NaCl, 0.01% LMNG
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chlorideNaCl1
220 mMTRISC4H11NO31
30.01 w/v%LMNGC47H88O221
SpecimenConc.: 3.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Sample was plunge-frozen without prior pretreatment.
Specimen supportGrid material: GOLD / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: LEICA EM GP / Cryogen name: ETHANE-PROPANE / Humidity: 90 % / Chamber temperature: 283 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: 130000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Calibrated defocus min: 1000 nm / Calibrated defocus max: 2500 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 0.93 sec. / Electron dose: 59.9 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 7906
Details: micrographs were collected in super-resolution mode, 38 frames per movie
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV
Image scansWidth: 11520 / Height: 8184

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Processing

EM softwareName: PHENIX / Version: 1.21.1_5286 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.23 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 155919 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Atomic model buildingPDB-ID: 6TEJ

6tej


Accession code: 6TEJ / Source name: PDB / Type: experimental model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 46.74 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00328667
ELECTRON MICROSCOPYf_angle_d0.551311826
ELECTRON MICROSCOPYf_chiral_restr0.03971444
ELECTRON MICROSCOPYf_plane_restr0.00531521
ELECTRON MICROSCOPYf_dihedral_angle_d11.15793109

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