4khz

X-ray diffraction
2.9Å resolution

Crystal structure of the maltose-binding protein/maltose transporter complex in an pre-translocation conformation bound to maltoheptaose

Released:
Primary publication:
Structural basis for substrate specificity in the Escherichia coli maltose transport system.
Proc Natl Acad Sci U S A 110 18132-7 (2013)
PMID: 24145421

Function and Biology Details

Structure analysis Details

Assembly composition:
hetero pentamer (preferred)
PDBe Complex ID:
PDB-CPX-136374 (preferred)
Entry contents:
4 distinct polypeptide molecules
Macromolecules (6 distinct):
Maltose/maltodextrin-binding periplasmic protein Chain: E
Molecule details ›
Chain: E
Length: 380 amino acids
Theoretical weight: 41.9 KDa
Source organism: Escherichia coli K-12
Expression system: Escherichia coli
UniProt:
  • Canonical: P0AEX9 (Residues: 27-396; Coverage: 100%)
Gene names: JW3994, b4034, malE
Sequence domains: Bacterial extracellular solute-binding protein
Structure domains: Periplasmic binding protein-like II
Maltose/maltodextrin transport system permease protein MalF Chain: F
Molecule details ›
Chain: F
Length: 514 amino acids
Theoretical weight: 57.05 KDa
Source organism: Escherichia coli K-12
Expression system: Escherichia coli
UniProt:
  • Canonical: P02916 (Residues: 1-514; Coverage: 100%)
Gene names: JW3993, b4033, malF
Sequence domains:
Structure domains:
Binding-protein-dependent transport systems inner membrane component Chain: G
Molecule details ›
Chain: G
Length: 296 amino acids
Theoretical weight: 32.25 KDa
Source organism: Escherichia coli DH1
Expression system: Escherichia coli
Structure domains: MetI-like
Binding-protein-dependent transport systems inner membrane component Chains: A, B
Molecule details ›
Chains: A, B
Length: 381 amino acids
Theoretical weight: 42.18 KDa
Source organism: Escherichia coli DH1
Expression system: Escherichia coli
Structure domains:

Ligands and Environments

Carbohydrate polymer : NEW Components: GLC
Carbohydrate polymer : NEW Components: GLC
1 bound ligand:
No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: APS BEAMLINE 23-ID-D
Spacegroup: P1
Unit cell:
a: 76.253Å b: 92.221Å c: 117.814Å
α: 90.73° β: 101.68° γ: 103.6°
R-values:
R R work R free
0.245 0.243 0.283
Expression system: Escherichia coli