5MK9

Maltodextrin binding protein MalE1 from L. casei BL23 bound to beta-cyclodextrin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.92 Å
  • R-Value Free: 0.122 
  • R-Value Work: 0.109 
  • R-Value Observed: 0.109 

wwPDB Validation   3D Report Full Report


This is version 2.0 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:  
    5M28, 5MK9, 5MKA, 5MKB, 5MTT, 5MTU

  • 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 sugars when a preferred carbon source such as glucose is available ...

    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-MalF1G1K1 2 ) 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 für Biologie/Physiologie der Mikroorganismen, Humboldt-Universität zu Berlin, Berlin, D-10099, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MalE1A379Lacticaseibacillus caseiMutation(s): 0 
Gene Names: malE1
UniProt
Find proteins for B0L7B0 (Lactobacillus casei)
Explore B0L7B0 
Go to UniProtKB:  B0L7B0
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
Cycloheptakis-(1-4)-(alpha-D-glucopyranose)B7N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G01435GL
GlyCosmos:  G01435GL
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], E [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900012
Query on PRD_900012
Bbeta-cyclodextrinOligosaccharide / Drug delivery Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.92 Å
  • R-Value Free: 0.122 
  • R-Value Work: 0.109 
  • R-Value Observed: 0.109 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.137α = 90
b = 74.895β = 90
c = 90.075γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
SHELXDEphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research FoundationGermanySFB1078

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-05
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Author supporting evidence, Data collection, Derived calculations, Non-polymer description, Structure summary