4IRM

Crystal structure of mntc r116a mutant exhibits flexibility in the c-terminal domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.294 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Arginine 116 stabilizes the entrance to the metal ion-binding site of the MntC protein.

Kanteev, M.Adir, N.

(2013) Acta Crystallogr Sect F Struct Biol Cryst Commun 69: 237-242

  • DOI: 10.1107/S174430911300153X
  • Primary Citation of Related Structures:  
    3UJP, 4IRM

  • PubMed Abstract: 
  • The cyanobacterium Synechocystis sp. PCC 6803 imports Mn2+ ions via MntCAB, an ABC transport system that is expressed at submicromolar Mn2+ concentrations. The structures of the wild type (WT) and a site-directed mutant of the MntC solute-binding pro ...

    The cyanobacterium Synechocystis sp. PCC 6803 imports Mn2+ ions via MntCAB, an ABC transport system that is expressed at submicromolar Mn2+ concentrations. The structures of the wild type (WT) and a site-directed mutant of the MntC solute-binding protein have been determined at 2.7 and 3.5 Å resolution, respectively. The WT structure is significantly improved over the previously determined structure (PDB entry 1xvl), showing improved Mn2+ binding site parameters, disulfide bonds in all three monomers and ions bound to the protein surface, revealing the role of Zn2+ ions in the crystallization liquor. The structure of MntC reveals that the active site is surrounded by neutral-to-positive electrostatic potential and is dominated by a network of polar interactions centred around Arg116. The mutation of this residue to alanine was shown to destabilize loops in the entrance to the metal-ion binding site and suggests a possible role in MntC function.


    Organizational Affiliation

    Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mn transporter; MntCABC330Synechocystis sp. PCC 6803Mutation(s): 1 
Gene Names: mntC
Find proteins for Q79EF9 (Synechocystis sp. (strain PCC 6803 / Kazusa))
Explore Q79EF9 
Go to UniProtKB:  Q79EF9
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download CCD File 
A, B, C
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.294 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.4α = 90
b = 128.4β = 90
c = 90.51γ = 120
Software Package:
Software NamePurpose
DNAdata collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2013-01-15 
  • Released Date: 2013-02-06 
  • Deposition Author(s): Kanteev, M., Adir, N.
  • This entry supersedes: 3V63

Revision History 

  • Version 1.0: 2013-02-06
    Type: Initial release
  • Version 1.1: 2013-05-01
    Changes: Database references