5LWK

MaeR response regulator bound to beryllium trifluoride


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The malate sensing two-component system MaeKR is a non-canonical class of sensory complex for C4-dicarboxylates.

Miguel-Romero, L.Casino, P.Landete, J.M.Monedero, V.Zuniga, M.Marina, A.

(2017) Sci Rep 7: 2708-2708

  • DOI: https://doi.org/10.1038/s41598-017-02900-z
  • Primary Citation of Related Structures:  
    5LWK, 5LWL

  • PubMed Abstract: 

    Microbial colonization of different environments is enabled to a great extent by the plasticity of their sensory mechanisms, among them, the two-component signal transduction systems (TCS). Here, an example of TCS plasticity is presented: the regulation of L-malate catabolism via malic enzyme by MaeRK in Lactobacillales. MaeKR belongs to the citrate family of TCS as the Escherichia coli DcuSR system. We show that the Lactobacillus casei histidine-kinase MaeK is defective in autophosphorylation activity as it lacks a functional catalytic and ATP binding domain. The cognate response regulator MaeR was poorly phosphorylated at its phosphoacceptor Asp in vitro. This phosphorylation, however, enhanced MaeR binding in vitro to its target sites and it was required for induction of regulated genes in vivo. Elucidation of the MaeR structure revealed that response regulator dimerization is accomplished by the swapping of α4-β5-α5 elements between two monomers, generating a phosphoacceptor competent conformation. Sequence and phylogenetic analyses showed that the MaeKR peculiarities are not exclusive to L. casei as they are shared by the rest of orthologous systems of Lactobacillales. Our results reveal MaeKR as a non-canonical TCS displaying distinctive features: a swapped response regulator and a sensor histidine kinase lacking ATP-dependent kinase activity.


  • Organizational Affiliation

    Department of Genomic and Proteomic, Instituto de Biomedicina de Valencia (IBV-CSIC), Jaume Roig 11, 46010, Valencia, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional regulatory protein
A, B
122Lacticaseibacillus paracaseiMutation(s): 0 
Gene Names: LPL9_2999
UniProt
Find proteins for A0A247D6V8 (Lacticaseibacillus paracasei)
Explore A0A247D6V8 
Go to UniProtKB:  A0A247D6V8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A247D6V8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.795α = 90
b = 75.795β = 90
c = 147.555γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
PHASERphasing
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Spanish Ministry of Science and InnovationSpainAGL2007-60975
Spanish Ministry of Science and InnovationSpainAGL2010-15679
Generalitat ValencianaSpainACOMP2012/137

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-28
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Author supporting evidence, Data collection, Database references, Derived calculations, Refinement description