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- PDB-8ypt: Cryo-EM structure of BfUbb-ButCD complex -

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Basic information

Entry
Database: PDB / ID: 8ypt
TitleCryo-EM structure of BfUbb-ButCD complex
Components
  • Membrane protein
  • TonB-linked outer membrane protein
  • Ubiquitin-like protein
KeywordsMEMBRANE PROTEIN / transporter / TonB-dependent
Function / homology
Function and homology information


cell outer membrane
Similarity search - Function
SusD-like, N-terminal / Starch-binding associating with outer membrane / RagB/SusD domain / SusD family / Prokaryotic membrane lipoprotein lipid attachment site profile. / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
Membrane protein / : / :
Similarity search - Component
Biological speciesBacteroides fragilis (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.05 Å
AuthorsXu, J.H. / Chen, Z. / Gao, X.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2024
Title: A highly conserved SusCD transporter determines the import and species-specific antagonism of Bacteroides ubiquitin homologues.
Authors: Ming Tong / Jinghua Xu / Weixun Li / Kun Jiang / Yan Yang / Zhe Chen / Xuyao Jiao / Xiangfeng Meng / Mingyu Wang / Jie Hong / Hongan Long / Shuang-Jiang Liu / Bentley Lim / Xiang Gao /
Abstract: Efficient interbacterial competitions and diverse defensive strategies employed by various bacteria play a crucial role in acquiring a hold within a dense microbial community. The gut symbiont ...Efficient interbacterial competitions and diverse defensive strategies employed by various bacteria play a crucial role in acquiring a hold within a dense microbial community. The gut symbiont Bacteroides fragilis secretes an antimicrobial ubiquitin homologue (BfUbb) that targets an essential periplasmic PPIase to drive intraspecies bacterial competition. However, the mechanisms by which BfUbb enters the periplasm and its potential for interspecies antagonism remain poorly understood. Here, we employ transposon mutagenesis and identify a highly conserved TonB-dependent transporter SusCD (designated as ButCD) in B. fragilis as the BfUbb transporter. As a putative protein-related nutrient utilization system, ButCD is widely distributed across diverse Bacteroides species with varying sequence similarity, resulting in distinct import efficiency of Bacteroides ubiquitin homologues (BUbb) and thereby determining the species-specific toxicity of BUbb. Cryo-EM structural and functional investigations of the BfUbb-ButCD complex uncover distinctive structural features of ButC that are crucial for its targeting by BfUbb. Animal studies further demonstrate the specific and efficient elimination of enterotoxigenic B. fragilis (ETBF) in the murine gut by BfUbb, suggesting its potential as a therapeutic against ETBF-associated inflammatory bowel disease and colorectal cancer. Our findings provide a comprehensive elucidation of the species-specific toxicity exhibited by BUbb and explore its potential applications.
History
DepositionMar 18, 2024Deposition site: PDBJ / Processing site: PDBJ
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Revision 1.1Oct 30, 2024Group: Data collection / Database references / Structure summary
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Membrane protein
B: Membrane protein
C: TonB-linked outer membrane protein
D: TonB-linked outer membrane protein
E: Ubiquitin-like protein


Theoretical massNumber of molelcules
Total (without water)327,1405
Polymers327,1405
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 Membrane protein / Starch-binding associating with outer membrane


Mass: 48007.312 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Bacteroides fragilis (bacteria) / References: UniProt: A0A2M9UVJ9
#2: Protein TonB-linked outer membrane protein


Mass: 111167.352 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Bacteroides fragilis (bacteria) / References: UniProt: A0A3E5IFP1
#3: Protein Ubiquitin-like protein


Mass: 8791.050 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bacteroides fragilis (bacteria) / Gene: O1404_18505 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A9Q4J272
Has protein modificationY

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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: ButCD-BfUbb complex / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)Organism: Bacteroides fragilis (bacteria)
Buffer solutionpH: 8
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: FEI TITAN 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: 60 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 298613 / Symmetry type: POINT

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