4JBW

Crystal structure of E. coli maltose transporter MalFGK2 in complex with its regulatory protein EIIAglc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.913 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.226 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Carbon catabolite repression of the maltose transporter revealed by X-ray crystallography.

Chen, S.Oldham, M.L.Davidson, A.L.Chen, J.

(2013) Nature 499: 364-368

  • DOI: 10.1038/nature12232

  • PubMed Abstract: 
  • Efficient carbon utilization is critical to the survival of microorganisms in competitive environments. To optimize energy usage, bacteria have developed an integrated control system to preferentially uptake carbohydrates that support rapid growth. T ...

    Efficient carbon utilization is critical to the survival of microorganisms in competitive environments. To optimize energy usage, bacteria have developed an integrated control system to preferentially uptake carbohydrates that support rapid growth. The availability of a preferred carbon source, such as glucose, represses the synthesis and activities of proteins necessary for the transport and metabolism of secondary carbon sources. This regulatory phenomenon is defined as carbon catabolite repression. In enteric bacteria, the key player of carbon catabolite repression is a component of the glucose-specific phosphotransferase system, enzyme IIA (EIIA(Glc)). It is known that unphosphorylated EIIA(Glc) binds to and inhibits a variety of transporters when glucose is available. However, understanding the underlying molecular mechanism has been hindered by the complete absence of structures for any EIIA(Glc)-transporter complexes. Here we present the 3.9 Å crystal structure of Escherichia coli EIIA(Glc) in complex with the maltose transporter, an ATP-binding cassette (ABC) transporter. The structure shows that two EIIA(Glc) molecules bind to the cytoplasmic ATPase subunits, stabilizing the transporter in an inward-facing conformation and preventing the structural rearrangements necessary for ATP hydrolysis. We also show that the half-maximal inhibitory concentrations of the full-length EIIA(Glc) and an amino-terminal truncation mutant differ by 60-fold, consistent with the hypothesis that the amino-terminal region, disordered in the crystal structure, functions as a membrane anchor to increase the effective EIIA(Glc) concentration at the membrane. Together these data suggest a model of how the central regulatory protein EIIA(Glc) allosterically inhibits maltose uptake in E. coli.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maltose transport system permease protein MalF
F, H
514Escherichia 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
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Glucose-specific phosphotransferase enzyme IIA component
M, N, O, P
172Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: crr (gsr, iex, tgs, treD)
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 P69783 (Escherichia coli (strain K12))
Go to UniProtKB:  P69783
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PGV
Query on PGV

Download SDF File 
Download CCD File 
F, H
(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE
PHOSPHATIDYLGLYCEROL, 2-VACCENOYL-1-PALMITOYL-SN-GLYCEROL-3-PHOSPHOGLYCEROL
C40 H77 O10 P
ADYWCMPUNIVOEA-GPJPVTGXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.913 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.226 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 94.529α = 90.00
b = 208.448β = 90.00
c = 347.477γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data collection
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-06-12
    Type: Initial release
  • Version 1.1: 2013-07-17
    Type: Database references