2R6G

The Crystal Structure of the E. coli Maltose Transporter

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history. 


Literature

Crystal structure of a catalytic intermediate of the maltose transporter.

Oldham, M.L., Khare, D., Quiocho, F.A., Davidson, A.L., Chen, J.

(2007) Nature 450: 515-521

  • DOI: 10.1038/nature06264
  • Primary Citation of Related Structures:  
    2R6G

  • PubMed Abstract: 

    • The maltose uptake system of Escherichia coli is a well-characterized member of the ATP-binding cassette transporter superfamily. Here we present the 2.8-A crystal structure of the intact maltose transporter in complex with the maltose-binding protein, maltose and ATP ...

    The maltose uptake system of Escherichia coli is a well-characterized member of the ATP-binding cassette transporter superfamily. Here we present the 2.8-A crystal structure of the intact maltose transporter in complex with the maltose-binding protein, maltose and ATP. This structure, stabilized by a mutation that prevents ATP hydrolysis, captures the ATP-binding cassette dimer in a closed, ATP-bound conformation. Maltose is occluded within a solvent-filled cavity at the interface of the two transmembrane subunits, about halfway into the lipid bilayer. The binding protein docks onto the entrance of the cavity in an open conformation and serves as a cap to ensure unidirectional translocation of the sugar molecule. These results provide direct evidence for a concerted mechanism of transport in which solute is transferred from the binding protein to the transmembrane subunits when the cassette dimer closes to hydrolyse ATP.

    Organizational Affiliation: 

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Maltose/maltodextrin import ATP-binding protein malK A, B381Escherichia coli K-12Mutation(s): 1 
Gene Names: malK, b4035, JW3995
EC: 3.6.3.19 (PDB Primary Data), 7.5.2.1 (UniProt)
Find proteins for P68187 (Escherichia coli (strain K12))
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Go to UniProtKB:  P68187
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Maltose-binding periplasmic protein E370Escherichia coli K-12Mutation(s): 0 
Gene Names: malE, b4034, JW3994
Find proteins for P0AEX9 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0AEX9
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Maltose transport system permease protein malF F514Escherichia coli K-12Mutation(s): 0 
Gene Names: malF, b4033, JW3993
Find proteins for P02916 (Escherichia coli (strain K12))
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Go to UniProtKB:  P02916
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Maltose transport system permease protein malG G296Escherichia coli K-12Mutation(s): 0 
Gene Names: malG, b4032, JW3992
Find proteins for P68183 (Escherichia coli (strain K12))
Explore P68183 
Go to UniProtKB:  P68183
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 5
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose
C
2 N/A Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP
Download Ideal Coordinates CCD File 
A, B
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N		 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 5
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900001
Query on PRD_900001		Calpha-maltoseOligosaccharide /  Nutrient

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.26α = 87.13
b = 95.86β = 82.43
c = 109.99γ = 75.75
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
DMphasing
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-11-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2018-01-24
    Changes: Structure summary
  • 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