2CFQ

Sugar Free Lactose Permease at neutral pH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.262 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural Evidence for Induced Fit and a Mechanism for Sugar/H(+) Symport in Lacy.

Mirza, O.Guan, L.Verner, G.Iwata, S.Kaback, H.R.

(2006) EMBO J 25: 2038

  • DOI: https://doi.org/10.1038/sj.emboj.7601028
  • Primary Citation of Related Structures:  
    2CFP, 2CFQ

  • PubMed Abstract: 

    Cation-coupled active transport is an essential cellular process found ubiquitously in all living organisms. Here, we present two novel ligand-free X-ray structures of the lactose permease (LacY) of Escherichia coli determined at acidic and neutral pH, and propose a model for the mechanism of coupling between lactose and H+ translocation. No sugar-binding site is observed in the absence of ligand, and deprotonation of the key residue Glu269 is associated with ligand binding. Thus, substrate induces formation of the sugar-binding site, as well as the initial step in H+ transduction.


  • Organizational Affiliation

    Department of Biological Sciences, Membrane Protein Crystallography Group, Imperial College London, London, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LACTOSE PERMEASE417Escherichia coliMutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for P02920 (Escherichia coli (strain K12))
Explore P02920 
Go to UniProtKB:  P02920
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02920
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.262 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.47α = 90
b = 122.47β = 90
c = 187.78γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-03-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description