4OAA

Crystal structure of E. coli lactose permease G46W,G262W bound to sugar

• PDB DOI: https://doi.org/10.2210/pdb4OAA/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Escherichia coli str. K-12 substr. DH10B
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2014-01-03 Released: 2014-01-29 
• Deposition Author(s): Kumar, H., Kasho, V., Smirnova, I., Finer-Moore, J., Kaback, H.R., Stroud, R.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.50 Å
• R-Value Free: 0.293 
• R-Value Work: 0.257 
• R-Value Observed: 0.258 

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 94.3 kDa 
• Atom Count: 6,257 
• Modelled Residue Count: 782 
• Deposited Residue Count: 834 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Lactose/galactose transporter	A, B	417	Escherichia coli str. K-12 substr. DH10B	Mutation(s): 2  Gene Names: lacY, ECDH10B_1356

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-galactopyranose-(1-1)-1-thio-beta-D-galactopyranose	C [auth E], D [auth F]	2	N/A	N/A

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900027	C [auth E], D [auth F]	thiodigalactoside	Oligosaccharide / Substrate analog

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.50 Å
• R-Value Free: 0.293 
• R-Value Work: 0.257 
• R-Value Observed: 0.258 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 101.56	α = 90
b = 121.94	β = 90
c = 264.01	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PHASER	phasing
ELVES	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-01-29 
Deposition Author(s): Kumar, H., Kasho, V., Smirnova, I., Finer-Moore, J., Kaback, H.R., Stroud, R.M.

Revision History  

• Version 1.0: 2014-01-29
  Type: Initial release
  
• Version 1.1: 2014-02-26
  Changes: Database references
• Version 1.2: 2017-11-22
  Changes: Refinement description
• Version 1.3: 2019-07-17
  Changes: Data collection, Refinement description
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary
• Version 3.0: 2020-08-12
  Changes: Atomic model, Data collection, Derived calculations, Structure summary
• Version 3.1: 2023-09-20
  Changes: Data collection, Database references, Refinement description