28QM | pdb_000028qm

MBP bound to distal DARPin (AHIR dodecamer scaffold system)

PDB DOI: https://doi.org/10.2210/pdb28QM/pdb
EM Map EMD-56750: 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., Pike, A.C.W., Sauer, D.B., Martin, M., Dlamini, L.S.
Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.40 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

Validation slider image for 28QM

This is version 1.0 of the entry. See complete history.

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.

Macromolecule Content

Total Structure Weight: 57.9 kDa
Atom Count: 4,034
Modeled Residue Count: 532
Deposited Residue Count: 532
Unique protein chains: 2

Macromolecules

Find similar proteins by:

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Maltose-binding periplasmic protein,PigG	A	373	Homo sapiens	Mutation(s): 0 Gene Names: malE, JW3994
UniProt
Find proteins for A0ACD6BAW2 (Serratia sp. (strain FS14)) Explore A0ACD6BAW2 Go to UniProtKB: A0ACD6BAW2
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	A0ACD6BAW2
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
DARPin	B	159	synthetic construct	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
EOH (Subject of Investigation/LOI) Query on EOH Download:Ideal Coordinates CCD File SDF format, chain C [auth B] MOL2 format, chain C [auth B] mmCIF format, chain C [auth B]	C [auth B]	ETHANOL C₂ H₆ O LFQSCWFLJHTTHZ-UHFFFAOYSA-N		Interactions Focus chain C [auth B] Interactions & Density Focus chain C [auth B]

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.40 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

View Full Validation Report

View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-02-25

Deposition Author(s):

Ferreira, D.S.M.

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

Revision History (Full details and data files)

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

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.