3R60

Structure of the MntR Fe2+ Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Roles of the A and C Sites in the Manganese-Specific Activation of MntR.

McGuire, A.M.Cuthbert, B.J.Ma, Z.Grauer-Gray, K.D.Brunjes Brophy, M.Spear, K.A.Soonsanga, S.Kliegman, J.I.Griner, S.L.Helmann, J.D.Glasfeld, A.

(2013) Biochemistry 52: 701-713

  • DOI: 10.1021/bi301550t
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The manganese transport regulator (MntR) represses the expression of genes involved in manganese uptake in Bacillus subtilis. It selectively responds to Mn(2+) and Cd(2+) over other divalent metal cations, including Fe(2+), Co(2+), and Zn(2+). Previo ...

    The manganese transport regulator (MntR) represses the expression of genes involved in manganese uptake in Bacillus subtilis. It selectively responds to Mn(2+) and Cd(2+) over other divalent metal cations, including Fe(2+), Co(2+), and Zn(2+). Previous work has shown that MntR forms binuclear complexes with Mn(2+) or Cd(2+) at two binding sites, labeled A and C, that are separated by 4.4 Å. Zinc activates MntR poorly and binds only to the A site, forming a mononuclear complex. The difference in metal binding stoichiometry suggested a mechanism for selectivity in MntR. Larger metal cations are strongly activating because they can form the binuclear complex, while smaller metal ions cannot bind with the geometry needed to fully occupy both metal binding sites. To investigate this hypothesis, structures of MntR in complex with two other noncognate metal ions, Fe(2+) and Co(2+), have been determined. Each metal forms a mononuclear complex with MntR with the metal ion bound in the A site, supporting the conclusions drawn from the Zn(2+) complex. Additionally, we investigated two site-specific mutants of MntR, E11K and H77A, that contain substitutions of metal binding residues in the A site. While metal binding in each mutant is significantly altered relative to that of wild-type MntR, both mutants retain activity and selectivity for Mn(2+) in vitro and in vivo. That observation, coupled with previous studies, suggests that the A and C sites both contribute to the selectivity of MntR.


    Organizational Affiliation

    Department of Chemistry, Reed College, Portland, OR 97202, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional regulator mntR
A, B
141Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: mntR (yqhN)
Find proteins for P54512 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P54512
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download SDF File 
Download CCD File 
A, B
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
HEPES
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
FE2
Query on FE2

Download SDF File 
Download CCD File 
A, B
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
 Ligand Interaction
PGO
Query on PGO

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Download CCD File 
B
S-1,2-PROPANEDIOL
C3 H8 O2
DNIAPMSPPWPWGF-VKHMYHEASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.239 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.680α = 90.00
b = 45.900β = 93.50
c = 74.690γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
EPMRphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-04-11
    Type: Initial release
  • Version 1.1: 2013-02-06
    Type: Database references