5MKB

Maltodextrin binding protein MalE1 from L. casei BL23 without ligand


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.698 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Inducer exclusion in Firmicutes: insights into the regulation of a carbohydrate ATP binding cassette transporter from Lactobacillus casei BL23 by the signal transducing protein P-Ser46-HPr.

Homburg, C.Bommer, M.Wuttge, S.Hobe, C.Beck, S.Dobbek, H.Deutscher, J.Licht, A.Schneider, E.

(2017) Mol. Microbiol. 105: 25-45

  • DOI: 10.1111/mmi.13680
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Catabolite repression is a mechanism that enables bacteria to control carbon utilization. As part of this global regulatory network, components of the phosphoenolpyruvate:carbohydrate phosphotransferase system inhibit the uptake of less favorable sug ...

    Catabolite repression is a mechanism that enables bacteria to control carbon utilization. As part of this global regulatory network, components of the phosphoenolpyruvate:carbohydrate phosphotransferase system inhibit the uptake of less favorable sugars when a preferred carbon source such as glucose is available. This process is termed inducer exclusion. In bacteria belonging to the phylum Firmicutes, HPr, phosphorylated at serine 46 (P-Ser46-HPr) is the key player but its mode of action is elusive. To address this question at the level of purified protein components, we have chosen a homolog of the Escherichia coli maltose/maltodextrin ATP-binding cassette transporter from Lactobacillus casei (MalE1-MalF1G1K12 ) as a model system. We show that the solute binding protein, MalE1, binds linear and cyclic maltodextrins but not maltose. Crystal structures of MalE1 complexed with these sugars provide a clue why maltose is not a substrate. P-Ser46-HPr inhibited MalE1/maltotetraose-stimulated ATPase activity of the transporter incorporated in proteoliposomes. Furthermore, cross-linking experiments revealed that P-Ser46-HPr contacts the nucleotide-binding subunit, MalK1, in proximity to the Walker A motif. However, P-Ser46-HPr did not block binding of ATP to MalK1. Together, our findings provide first biochemical evidence that P-Ser-HPr arrests the transport cycle by preventing ATP hydrolysis at the MalK1 subunits of the transporter.


    Organizational Affiliation

    Institut f├╝r Biologie/Physiologie der Mikroorganismen, Humboldt-Universit├Ąt zu Berlin, Berlin, D-10099, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MalE1
A, B, C, D, E, F, G, H
379Lactobacillus caseiMutation(s): 0 
Gene Names: malE1
Find proteins for B0L7B0 (Lactobacillus casei)
Go to UniProtKB:  B0L7B0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.698 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.178 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 41.036α = 74.51
b = 124.945β = 89.61
c = 143.739γ = 89.86
Software Package:
Software NamePurpose
XDSdata scaling
PHASERphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
DFGGermanySFB1078

Revision History 

  • Version 1.0: 2017-07-05
    Type: Initial release