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- PDB-7tcg: BceAB nucleotide-free conformation -

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Basic information

Entry
Database: PDB / ID: 7tcg
TitleBceAB nucleotide-free conformation
Components
  • Bacitracin export ATP-binding protein BceA
  • Bacitracin export permease protein BceB
KeywordsTRANSPORT PROTEIN / BceAB / bacitracin / transporter
Function / homology
Function and homology information


transmembrane transporter activity / transmembrane transport / response to antibiotic / ATP hydrolysis activity / ATP binding / plasma membrane
Similarity search - Function
ABC transporter permease protein, BceB-type / MacB, ATP-binding domain / ABC3 transporter permease protein domain / FtsX-like permease family / 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
Chem-I0O / Bacitracin export ATP-binding protein BceA / Bacitracin export permease protein BceB
Similarity search - Component
Biological speciesBacillus subtilis subsp. subtilis str. 168 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsGeorge, N.L. / Orlando, B.J.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Conformational snapshots of the bacitracin sensing and resistance transporter BceAB.
Authors: Natasha L George / Anthony L Schilmiller / Benjamin J Orlando /
Abstract: SignificanceMany gram-positive organisms have evolved an elegant solution to sense and resist antimicrobial peptides that inhibit cell-wall synthesis. These organisms express an unusual "Bce-type" ...SignificanceMany gram-positive organisms have evolved an elegant solution to sense and resist antimicrobial peptides that inhibit cell-wall synthesis. These organisms express an unusual "Bce-type" adenosine triphosphate-binding cassette (ABC) transporter that recognizes complexes formed between antimicrobial peptides and lipids involved in cell-wall biosynthesis. In this work, we provide the first structural snapshots of a Bce-type ABC transporter trapped in different conformational states. Our structures and associated biochemical data provide key insights into the novel target protection mechanism that these unusual ABC transporters use to sense and resist antimicrobial peptides. The studies described herein set the stage to begin developing a comprehensive molecular understanding of the diverse interactions between antimicrobial peptides and conserved resistance machinery found across most gram-positive organisms.
History
DepositionDec 23, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 6, 2022Provider: repository / Type: Initial release
Revision 1.1Apr 13, 2022Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Feb 28, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Bacitracin export permease protein BceB
B: Bacitracin export ATP-binding protein BceA
C: Bacitracin export ATP-binding protein BceA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)131,6014
Polymers130,7593
Non-polymers8421
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Bacitracin export permease protein BceB


Mass: 72262.109 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bacillus subtilis subsp. subtilis str. 168 (bacteria)
Strain: 168 / Gene: bceB, barD, ytsD, BSU30370 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): C41 / References: UniProt: O34741
#2: Protein Bacitracin export ATP-binding protein BceA


Mass: 29248.377 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bacillus subtilis subsp. subtilis str. 168 (bacteria)
Strain: 168 / Gene: bceA, barC, ytsC, BSU30380 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): C41 / References: UniProt: O34697
#3: Chemical ChemComp-I0O / 4-amino-4-deoxy-1-O-[(S)-hydroxy{[(2E,6E,10Z,14Z,18Z,22E,26E,30E)-3,7,11,15,19,23,27,31,35-nonamethylhexatriaconta-2,6,10,14,18,22,26,30,34-nonaen-1-yl]oxy}phosphoryl]-alpha-L-arabinopyranose


Mass: 842.178 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C50H84NO7P / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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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: BceAB / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.129 MDa / Experimental value: NO
Source (natural)Organism: Bacillus subtilis subsp. subtilis str. 168 (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: C41 / Plasmid: pETDUET-1
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
125 mMTris1
2150 mMsodium chlorideNaClSodium chloride1
30.005 %LMNG1
SpecimenConc.: 7 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 15mA in Pelco EasyGlow / Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.1 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 105000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 60.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameVersionCategory
4cryoSPARC3.2.0CTF correction
9cryoSPARC3.2.0initial Euler assignment
12cryoSPARC3.2.03D reconstruction
13PHENIX1.19model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 307715 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0029037
ELECTRON MICROSCOPYf_angle_d0.5212146
ELECTRON MICROSCOPYf_dihedral_angle_d4.6641233
ELECTRON MICROSCOPYf_chiral_restr0.0411401
ELECTRON MICROSCOPYf_plane_restr0.0041517

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