3FH6

Crystal structure of the resting state maltose transporter from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.5 Å
  • R-Value Free: 0.363 
  • R-Value Work: 0.340 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Alternating access in maltose transporter mediated by rigid-body rotations.

Khare, D.Oldham, M.L.Orelle, C.Davidson, A.L.Chen, J.

(2009) Mol.Cell 33: 528-536

  • DOI: 10.1016/j.molcel.2009.01.035

  • PubMed Abstract: 
  • ATP-binding cassette transporters couple ATP hydrolysis to substrate translocation through an alternating access mechanism, but the nature of the conformational changes in a transport cycle remains elusive. Previously we reported the structure of the ...

    ATP-binding cassette transporters couple ATP hydrolysis to substrate translocation through an alternating access mechanism, but the nature of the conformational changes in a transport cycle remains elusive. Previously we reported the structure of the maltose transporter MalFGK(2) in an outward-facing conformation in which the transmembrane (TM) helices outline a substrate-binding pocket open toward the periplasmic surface and ATP is poised for hydrolysis along the closed nucleotide-binding dimer interface. Here we report the structure of the nucleotide-free maltose transporter in which the substrate binding pocket is only accessible from the cytoplasm and the nucleotide-binding interface is open. Comparison of the same transporter crystallized in two different conformations reveals that alternating access involves rigid-body rotations of the TM subdomains that are coupled to the closure and opening of the nucleotide-binding domain interface. The comparison also reveals that point mutations enabling binding protein-independent transport line dynamic interfaces in the TM region.


    Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maltose transport system permease protein malF
F, H
480Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: malF
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
MalFGK2-MBP Maltose uptake transporter complex
Find proteins for P02916 (Escherichia coli (strain K12))
Go to UniProtKB:  P02916
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Maltose transport system permease protein malG
G, I
296Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: malG
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
MalFGK2-MBP Maltose uptake transporter complex
Find proteins for P68183 (Escherichia coli (strain K12))
Go to UniProtKB:  P68183
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Maltose/maltodextrin import ATP-binding protein malK
A, B, C, D
381Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: malK
EC: 7.5.2.1
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
MalFGK2-MBP Maltose uptake transporter complex
Find proteins for P68187 (Escherichia coli (strain K12))
Go to UniProtKB:  P68187
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.5 Å
  • R-Value Free: 0.363 
  • R-Value Work: 0.340 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 171.097α = 90.00
b = 209.480β = 90.00
c = 438.741γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SHARPphasing
MAR345data collection
DMphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-03
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Source and taxonomy, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description