4PUR

Crystal structure of MglA from Francisella tularensis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.178 

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This is version 1.1 of the entry. See complete history


Literature

Structural and Biochemical Characterization of the Francisella tularensis Pathogenicity Regulator, Macrophage Locus Protein A (MglA).

Cuthbert, B.J.Brennan, R.G.Schumacher, M.A.

(2015) PLoS One 10: e0128225-e0128225

  • DOI: 10.1371/journal.pone.0128225
  • Primary Citation of Related Structures:  
    4PUR

  • PubMed Abstract: 
  • Francisella tularensis is one of the most infectious bacteria known and is the etiologic agent of tularemia. Francisella virulence arises from a 33 kilobase (Kb) pathogenicity island (FPI) that is regulated by the macrophage locus protein A (MglA) and the stringent starvation protein A (SspA) ...

    Francisella tularensis is one of the most infectious bacteria known and is the etiologic agent of tularemia. Francisella virulence arises from a 33 kilobase (Kb) pathogenicity island (FPI) that is regulated by the macrophage locus protein A (MglA) and the stringent starvation protein A (SspA). These proteins interact with both RNA polymerase (RNAP) and the pathogenicity island gene regulator (PigR) to activate FPI transcription. However, the molecular mechanisms involved are not well understood. Indeed, while most bacterial SspA proteins function as homodimers to activate transcription, F. tularensis SspA forms a heterodimer with the MglA protein, which is unique to F. tularensis. To gain insight into MglA function, we performed structural and biochemical studies. The MglA structure revealed that it contains a fold similar to the SspA protein family. Unexpectedly, MglA also formed a homodimer in the crystal. Chemical crosslinking and size exclusion chromatography (SEC) studies showed that MglA is able to self-associate in solution to form a dimer but that it preferentially heterodimerizes with SspA. Finally, the MglA structure revealed malate, which was used in crystallization, bound in an open pocket formed by the dimer, suggesting the possibility that this cleft could function in small molecule ligand binding. The location of this binding region relative to recently mapped PigR and RNAP interacting sites suggest possible roles for small molecule binding in MglA and SspA•MglA function.


    Organizational Affiliation

    Department of Biochemistry, Duke University School of Medicine, Durham, North Carolina, 27710, United States of America.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Macrophage growth locus, subunit AA, B208Francisella tularensis subsp. tularensis SCHU S4Mutation(s): 0 
Gene Names: FTT_1275mglA
UniProt
Find proteins for Q5NFG1 (Francisella tularensis subsp. tularensis (strain SCHU S4 / Schu 4))
Explore Q5NFG1 
Go to UniProtKB:  Q5NFG1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5NFG1
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MLT
Query on MLT

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
D-MALATE
C4 H6 O5
BJEPYKJPYRNKOW-UWTATZPHSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.178 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.684α = 90
b = 104.684β = 90
c = 100.045γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
MOSFLMdata reduction
SOLVEphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-24
    Type: Initial release
  • Version 1.1: 2021-01-13
    Changes: Database references, Derived calculations