28QN | pdb_000028qn

MBP-maltose bound to distal DARPin (AHIR dodecamer scaffold system)

• PDB DOI: https://doi.org/10.2210/pdb28QN/pdb
• EM Map EMD-56751: EMDB EMDataResource

• Classification: SUGAR BINDING PROTEIN
• Organism(s): Homo sapiens, synthetic construct
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2026-02-13 Released: 2026-02-25 
• Deposition Author(s): Ferreira, 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 Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

An engineered symmetrical scaffold system enables high resolution imaging of small cargo proteins by cryo-electron microscopy

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.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 58.83 kDa 
• Atom Count: 4,087 
• Modeled Residue Count: 534 
• Deposited Residue Count: 534 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Maltodextrin-binding protein	A [auth Ba]	374	Homo sapiens	Mutation(s): 0  Gene Names: malE, DU74_04045
UniProt
Find proteins for A0A0F8NYV9 (Methanosarcina mazei) Explore A0A0F8NYV9  Go to UniProtKB:  A0A0F8NYV9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
DARPin	B [auth A]	160	synthetic construct	Mutation(s): 0

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	C [auth B]	2		N/A

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EOH	D [auth A]	ETHANOL C2 H6 O LFQSCWFLJHTTHZ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487:
RECONSTRUCTION	cryoSPARC

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2026-02-25 
Deposition Author(s): Ferreira, 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.

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Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/T003677/1

Revision History  

• Version 1.0: 2026-02-25
  Type: Initial release