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- PDB-9fkq: Cryo-EM structure of MBP homo-dimer assembled by homo Di-Gluebody... -

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Basic information

Entry
Database: PDB / ID: 9fkq
TitleCryo-EM structure of MBP homo-dimer assembled by homo Di-Gluebody - MBP local refinement
ComponentsMaltose/maltodextrin-binding periplasmic protein
KeywordsPROTEIN BINDING / Gluebody / Nanobody / cryo-EM SPA / small protein
Function / homology
Function and homology information


detection of maltose stimulus / maltose transport complex / carbohydrate transport / carbohydrate transmembrane transporter activity / maltose binding / maltose transport / maltodextrin transmembrane transport / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex / cell chemotaxis ...detection of maltose stimulus / maltose transport complex / carbohydrate transport / carbohydrate transmembrane transporter activity / maltose binding / maltose transport / maltodextrin transmembrane transport / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex / cell chemotaxis / outer membrane-bounded periplasmic space / periplasmic space / DNA damage response / membrane
Similarity search - Function
Maltose/Cyclodextrin ABC transporter, substrate-binding protein / Solute-binding family 1, conserved site / Bacterial extracellular solute-binding proteins, family 1 signature. / Bacterial extracellular solute-binding protein / Bacterial extracellular solute-binding protein
Similarity search - Domain/homology
Maltose/maltodextrin-binding periplasmic protein
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.45 Å
AuthorsYi, G. / Ye, M. / Mamalis, D. / Carrique, L. / Fairhead, M. / Li, H. / Duerr, K. / Zhang, P. / Sauer, D.B. / von Delft, F. ...Yi, G. / Ye, M. / Mamalis, D. / Carrique, L. / Fairhead, M. / Li, H. / Duerr, K. / Zhang, P. / Sauer, D.B. / von Delft, F. / Davis, B.G. / Gilbert, R.J.C.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Other private United Kingdom
CitationJournal: To Be Published
Title: Di-Gluebodies: Covalently-rigidified, modular protein assemblies enable simultaneous determination of high-resolution, low-size, cryo-EM structures
Authors: Yi, G. / Ye, M. / Mamalis, D. / Carrique, L. / Fairhead, M. / Li, H. / Duerr, K. / Zhang, P. / Sauer, D.B. / von Delft, F. / Davis, B.G. / Gilbert, R.J.C.
History
DepositionJun 3, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 18, 2025Provider: repository / Type: Initial release
Revision 1.0Jun 18, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jun 18, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jun 18, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 18, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jun 18, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jun 18, 2025Data 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: Maltose/maltodextrin-binding periplasmic protein


Theoretical massNumber of molelcules
Total (without water)43,1271
Polymers43,1271
Non-polymers00
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 Maltose/maltodextrin-binding periplasmic protein / MMBP / Maltodextrin-binding protein / Maltose-binding protein / MBP


Mass: 43126.527 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: malE, b4034, JW3994 / Production host: Escherichia coli (E. coli) / References: UniProt: P0AEX9
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: MBP homo-dimer assembled by homo Di-Gluebody GbMBP - MBP local refinement
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.114 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMHEPESC8H18N2O4S1
2150 mMSodium ChlorideNaCl1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK I / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 278 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 FIELD / Nominal defocus max: 2600 nm / Nominal defocus min: 1200 nm / Cs: 2.7 mm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)
EM imaging opticsEnergyfilter slit width: 20 eV

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
4cryoSPARCCTF correction
7UCSF ChimeraXmodel fitting
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
12cryoSPARCclassification
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.45 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 197442 / Num. of class averages: 6 / Symmetry type: POINT
Atomic model buildingPDB-ID: 5M13

5m13


Pdb chain-ID: A / Accession code: 5M13 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0022890
ELECTRON MICROSCOPYf_angle_d0.4423930
ELECTRON MICROSCOPYf_dihedral_angle_d3.708387
ELECTRON MICROSCOPYf_chiral_restr0.039426
ELECTRON MICROSCOPYf_plane_restr0.004511

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