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- EMDB-11274: Closed-closed state of the Bt1762-Bt1763 levan transport system -

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Basic information

Entry
Database: EMDB / ID: EMD-11274
TitleClosed-closed state of the Bt1762-Bt1763 levan transport system
Map dataMap filtered by local resolution using RELION's own implementation of local resolution filtering
Sample
  • Complex: Dimeric Bt1762-Bt1763 levan transporter complex
    • Complex: SusD homolog
      • Protein or peptide: SusD homolog
    • Complex: SusC homolog
      • Protein or peptide: SusC homolog
KeywordsSusCD / transporter / levan / TonB-dependent / MEMBRANE PROTEIN
Function / homology
Function and homology information


cell outer membrane / metal ion binding
Similarity search - Function
CarboxypepD_reg-like domain / TonB-dependent outer membrane protein, SusC/RagA / TonB-dependent outer membrane protein SusC/RagA, conserved site / SusD-like, N-terminal / Starch-binding associating with outer membrane / RagB/SusD domain / SusD family / Carboxypeptidase-like, regulatory domain superfamily / TonB-dependent receptor-like, beta-barrel / TonB dependent receptor-like, beta-barrel ...CarboxypepD_reg-like domain / TonB-dependent outer membrane protein, SusC/RagA / TonB-dependent outer membrane protein SusC/RagA, conserved site / SusD-like, N-terminal / Starch-binding associating with outer membrane / RagB/SusD domain / SusD family / Carboxypeptidase-like, regulatory domain superfamily / TonB-dependent receptor-like, beta-barrel / TonB dependent receptor-like, beta-barrel / TonB-dependent receptor (TBDR) proteins profile. / Vitamin B12 transporter BtuB-like / TonB-dependent receptor, plug domain superfamily / TonB-dependent receptor, plug domain / TonB-dependent Receptor Plug Domain / TonB-dependent receptor-like, beta-barrel domain superfamily / Prokaryotic membrane lipoprotein lipid attachment site profile. / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
SusC homolog / SusD homolog
Similarity search - Component
Biological speciesBacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482) (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.2 Å
AuthorsWhite JBR / van den Berg B
Funding support United Kingdom, Switzerland, 5 items
OrganizationGrant numberCountry
Biotechnology and Biological Sciences Research Council (BBSRC)BB/P003192/1 United Kingdom
Wellcome Trust215064/Z/18/Z United Kingdom
Wellcome Trust108466/Z/15/Z United Kingdom
Swiss National Science Foundation167125 Switzerland
Medical Research Council (MRC, United Kingdom)MR/N020413/1 United Kingdom
CitationJournal: Nat Commun / Year: 2021
Title: Insights into SusCD-mediated glycan import by a prominent gut symbiont.
Authors: Declan A Gray / Joshua B R White / Abraham O Oluwole / Parthasarathi Rath / Amy J Glenwright / Adam Mazur / Michael Zahn / Arnaud Baslé / Carl Morland / Sasha L Evans / Alan Cartmell / ...Authors: Declan A Gray / Joshua B R White / Abraham O Oluwole / Parthasarathi Rath / Amy J Glenwright / Adam Mazur / Michael Zahn / Arnaud Baslé / Carl Morland / Sasha L Evans / Alan Cartmell / Carol V Robinson / Sebastian Hiller / Neil A Ranson / David N Bolam / Bert van den Berg /
Abstract: In Bacteroidetes, one of the dominant phyla of the mammalian gut, active uptake of large nutrients across the outer membrane is mediated by SusCD protein complexes via a "pedal bin" transport ...In Bacteroidetes, one of the dominant phyla of the mammalian gut, active uptake of large nutrients across the outer membrane is mediated by SusCD protein complexes via a "pedal bin" transport mechanism. However, many features of SusCD function in glycan uptake remain unclear, including ligand binding, the role of the SusD lid and the size limit for substrate transport. Here we characterise the β2,6 fructo-oligosaccharide (FOS) importing SusCD from Bacteroides thetaiotaomicron (Bt1762-Bt1763) to shed light on SusCD function. Co-crystal structures reveal residues involved in glycan recognition and suggest that the large binding cavity can accommodate several substrate molecules, each up to ~2.5 kDa in size, a finding supported by native mass spectrometry and isothermal titration calorimetry. Mutational studies in vivo provide functional insights into the key structural features of the SusCD apparatus and cryo-EM of the intact dimeric SusCD complex reveals several distinct states of the transporter, directly visualising the dynamics of the pedal bin transport mechanism.
History
DepositionJul 1, 2020-
Header (metadata) releaseNov 11, 2020-
Map releaseNov 11, 2020-
UpdateJul 2, 2025-
Current statusJul 2, 2025Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.033
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.033
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6zlu
  • Surface level: 0.038
  • Imaged by UCSF Chimera
  • Download
  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6zlu
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_11274.png

Downloads & links

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Map

FileDownload / File: emd_11274.map.gz / Format: CCP4 / Size: 70.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMap filtered by local resolution using RELION's own implementation of local resolution filtering
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 264 pix.
= 282.48 Å		1.07 Å/pix.
x 264 pix.
= 282.48 Å		1.07 Å/pix.
x 264 pix.
= 282.48 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.033 / Movie #1: 0.033
Minimum - Maximum-0.16010931 - 0.27050954
Average (Standard dev.)0.00023995402 (±0.0059603606)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions264264264
Spacing264264264
CellA=B=C: 282.48 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z264264264
origin x/y/z0.0000.0000.000
length x/y/z282.480282.480282.480
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ400400400
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS264264264
D min/max/mean-0.1600.2710.000

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Supplemental data

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Mask #1

Fileemd_11274_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Sharpened post-processed map generated in RELION

Fileemd_11274_additional_1.map
AnnotationSharpened post-processed map generated in RELION
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Unsharpened map from 3D auto-refine in RELION

Fileemd_11274_additional_2.map
AnnotationUnsharpened map from 3D auto-refine in RELION
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Dimeric Bt1762-Bt1763 levan transporter complex

EntireName: Dimeric Bt1762-Bt1763 levan transporter complex
Components
  • Complex: Dimeric Bt1762-Bt1763 levan transporter complex
    • Complex: SusD homolog
      • Protein or peptide: SusD homolog
    • Complex: SusC homolog
      • Protein or peptide: SusC homolog

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Supramolecule #1: Dimeric Bt1762-Bt1763 levan transporter complex

SupramoleculeName: Dimeric Bt1762-Bt1763 levan transporter complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Molecular weightTheoretical: 360 KDa

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Supramolecule #2: SusD homolog

SupramoleculeName: SusD homolog / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482) (bacteria)

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Supramolecule #3: SusC homolog

SupramoleculeName: SusC homolog / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482) (bacteria)

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Macromolecule #1: SusD homolog

MacromoleculeName: SusD homolog / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482) (bacteria)
Molecular weightTheoretical: 66.142625 KDa
Recombinant expressionOrganism: Bacteroides thetaiotaomicron (bacteria)
SequenceString: MKKIIYIATI GITLLTTSCD DFLDRQVPQG IVTGDQIASP EYVDNLVISA YAIWATGDDI NSSFSLWNYD VRSDDCYKGG SGTEDGGVF NALEISKGIN TTDWNINDIW KRLYQCITRA NTALQSLDQM DEKTYPLKNQ RIAEMRFLRG HAHFMLKQLF K KIVIVNDE ...String:
MKKIIYIATI GITLLTTSCD DFLDRQVPQG IVTGDQIASP EYVDNLVISA YAIWATGDDI NSSFSLWNYD VRSDDCYKGG SGTEDGGVF NALEISKGIN TTDWNINDIW KRLYQCITRA NTALQSLDQM DEKTYPLKNQ RIAEMRFLRG HAHFMLKQLF K KIVIVNDE NMEPDAYNEL SNTTYTNDEQ WQKIADDFQF AYDNLPEVQI EKGRPAQAAA AAYLAKTYLY KAYRQDGADN AL TGINEED LKQVVKYTDP LIMAKGGYGL ETDYSMNFLP QYENGAESVW AIQYSINDGT YNGNLNWGMG LTTPQILGCC DFH KPSQNL VNAFKTDSQG KPLFSTYDNE NYEVATDNVD PRLFHTVGMP GFPYKYNEGY IIQKNDDWSR SKGLYGYYVS LKEN VDPDC DCLKKGSYWA SSLNHIVIRY ADVLLMRAEA LIQLNDGRIT DAISLINEVR SRAAGSTMLI FNYKEDYGVN FKVTP YDLK AYAQDEAMKM LKWERRVEFG MESSRFFDLV RWGEAKDVIN AYYVTEASRC SIYKNAGFTE NKNEYLPVPF EQISAS NGN YTQNFGWAAA AHHHHHH

UniProtKB: SusD homolog

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Macromolecule #2: SusC homolog

MacromoleculeName: SusC homolog / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482) (bacteria)
Molecular weightTheoretical: 115.483602 KDa
SequenceString: MPGIMKNKKL LCSVCFLFAF MSALWGQNIT VKGNVTSKTD GQPIIGASVV ETTATTNGTI TDFDGNFTLS VPVNSTLKIT YIGYKPVTV KAAAIVNVLL EEDTQMVDEV VVTGYTTQRK ADLTGAVSVV KVDEIQKQGE NNPVKALQGR VPGMNITADG N PSGSATVR ...String:
MPGIMKNKKL LCSVCFLFAF MSALWGQNIT VKGNVTSKTD GQPIIGASVV ETTATTNGTI TDFDGNFTLS VPVNSTLKIT YIGYKPVTV KAAAIVNVLL EEDTQMVDEV VVTGYTTQRK ADLTGAVSVV KVDEIQKQGE NNPVKALQGR VPGMNITADG N PSGSATVR IRGIGTLNNN DPLYIIDGVP TKAGMHELNG NDIESIQVLK DAASASIYGS RAANGVIIIT TKQGKKGQIK IN FDASVSA SMYQSKMNVL NTEQYGRAMW QAYVNDGENP NGNALGYAYN WGYNADGNPV LYGMTLSKYL DSKNTMPVAD TDW FDEITR TGVIQQYNLS VSNGSEKGSS FFSLGYYKNL GVIKDTDFDR FSARMNSDYK LIDDILTIGQ HFTLNRTSEV QAPG GIIET ALDIPSAIPV YASDGSWGGP VGGWPDRRNP RAVLEYNKDN RYTYWRMFGD AYVNLTPFKG FNLRSTFGLD YANKQ ARYF TYPYQEGTQT NNGKSAVEAK QEHWTKWMWN AIATYQLEVG KHRGDVMIGM ELNREDDSHF SGYKEDFSIL TPDYMW PDA GSGTAQAYGA GEGYSLVSFF GKMNYSYADR YLLSLTLRRD GSSRFGKNHR YATFPSVSLG WRITQENFMK ELTWLDD LK LRASWGQTGN QEISNLARYT IYAPNYGTTD SFGGQSYGTA YDITGSNGGG VLPSGFKRNQ IGNDNIKWET TTQTNVGI D FSLFKQSLYG SLEYYYKKAT DILTEMAGVG VLGEGGSRWI NSGAMKNQGF EFNLGYRNKT AFGLTYDLNG NISTYRNEI LELPETVAAN GKFGGNGVKS VVGHTYGAQV GYIADGIFKS QDEVDNHATQ EGAAVGRIRY RDIDHNGVID ERDQNWIYDP TPSFSYGLN IYLEYKNFDL TMFWQGVQGV DIISDVKKKS DFWSASNVGF LNKGTRLLNA WSPTNPNSDI PALTRSDTNN E QRVSTYFV ENGSFLKLRN IQLGYTVPAV ISKKMRMDRL RFYCSAQNLL TIKSKNFTGE DPENPNFSYP IPVNITFGLN IG F

UniProtKB: SusC homolog

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.02 mg/mL
BufferpH: 7.5
Component:
ConcentrationNameFormula
10.0 mMHEPES
100.0 mMSodium chlorideNaCl
0.05 % w/vLDAO
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 63.84 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
In silico model: Starting model was generated de novo from the data by stochastic gradient descent in RELION
Final reconstructionApplied symmetry - Point group: C2 (2 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 17416
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6zaz


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-6zlu:
Closed-closed state of the Bt1762-Bt1763 levan transport system

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