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- PDB-28qn: MBP-maltose bound to distal DARPin (AHIR dodecamer scaffold system) -

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Basic information

Entry
Database: PDB / ID: 28qn
TitleMBP-maltose bound to distal DARPin (AHIR dodecamer scaffold system)
Components
  • DARPin
  • Maltodextrin-binding protein
KeywordsSUGAR BINDING PROTEIN / MBP / DARPin / scaffold
Function / homology
Function and homology information


carbohydrate transmembrane transporter activity / maltose binding / maltose transport / maltodextrin transmembrane transport / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / periplasmic space
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
ETHANOL / Maltodextrin-binding protein
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsFerreira, D.S.M. / Noble, M. / Rowland, R.J. / Fairhead, M. / Gittins, O. / von Delft, F. / Endicott, J. / Martin, M. / Pike, A.C.W. / Sauer, D.B. / Dlamini, L.S.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Biotechnology and Biological Sciences Research Council (BBSRC)BB/T003677/1 United Kingdom
CitationJournal: To Be Published
Title: An engineered symmetrical scaffold system enables high resolution imaging of small cargo proteins by cryo-electron microscopy
Authors: Ferreira, D.S.M. / Noble, M. / Rowland, R.J. / Gittins, O. / Martin, M. / Endicott, J. / Fairhead, M. / von Delft, F. / Pike, A.C.W. / Sauer, D.B. / Dlamini, L.S.
History
DepositionFeb 13, 2026Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 25, 2026Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Additional map / Part number: 2 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Feb 25, 2026Data 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
Ba: Maltodextrin-binding protein
A: DARPin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)58,8264
Polymers58,4382
Non-polymers3882
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 Maltodextrin-binding protein


Mass: 41193.543 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: malE, DU74_04045 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A0F8NYV9
#2: Protein DARPin


Mass: 17244.344 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli BL21(DE3) (bacteria)
#3: Polysaccharide alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose


Type: oligosaccharide / Mass: 342.297 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpa1-4DGlcpa1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1a_1-5]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][a-D-Glcp]{[(4+1)][a-D-Glcp]{}}LINUCSPDB-CARE
#4: Chemical ChemComp-EOH / ETHANOL


Mass: 46.068 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C2H6O
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

Component
IDNameTypeEntity IDParent-IDSource
1MBP bound to DARPin on an AHIR dodecamer scaffold system.COMPLEX#1-#20RECOMBINANT
2DARPinCOMPLEX#21RECOMBINANT
3MBPCOMPLEX#12RECOMBINANT
Molecular weight
IDEntity assembly-IDValue (°)Experimental value
110.9 MDaNO
210.0176 MDaNO
310.0406 MDaNO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21synthetic construct (others)32630
32synthetic construct (others)32630
43synthetic construct (others)32630
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
21Escherichia coli BL21(DE3) (bacteria)469008
32Escherichia coli BL21(DE3) (bacteria)469008
43Escherichia coli BL21(DE3) (bacteria)469008
Buffer solutionpH: 7.5
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: TFS 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: 600 nm
Image recordingElectron dose: 50.5 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.20.1_4487:model refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 150405 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0024180
ELECTRON MICROSCOPYf_angle_d0.4645683
ELECTRON MICROSCOPYf_dihedral_angle_d3.549564
ELECTRON MICROSCOPYf_chiral_restr0.037625
ELECTRON MICROSCOPYf_plane_restr0.004739

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