4CIC

T. potens IscR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Unique Regulation of Iron-Sulfur Cluster Biogenesis in a Gram-Positive Bacterium.

Santos, J.A.Alonso-Garcia, N.Macedo-Ribeiro, S.Pereira, P.J.B.

(2014) Proc Natl Acad Sci U S A 111: E2251

  • DOI: 10.1073/pnas.1322728111
  • Primary Citation of Related Structures:  
    4CHU, 4CIC

  • PubMed Abstract: 
  • Iron-sulfur clusters function as cofactors of a wide range of proteins, with diverse molecular roles in both prokaryotic and eukaryotic cells. Dedicated machineries assemble the clusters and deliver them to the final acceptor molecules in a tightly regulated process ...

    Iron-sulfur clusters function as cofactors of a wide range of proteins, with diverse molecular roles in both prokaryotic and eukaryotic cells. Dedicated machineries assemble the clusters and deliver them to the final acceptor molecules in a tightly regulated process. In the prototypical Gram-negative bacterium Escherichia coli, the two existing iron-sulfur cluster assembly systems, iron-sulfur cluster (ISC) and sulfur assimilation (SUF) pathways, are closely interconnected. The ISC pathway regulator, IscR, is a transcription factor of the helix-turn-helix type that can coordinate a [2Fe-2S] cluster. Redox conditions and iron or sulfur availability modulate the ligation status of the labile IscR cluster, which in turn determines a switch in DNA sequence specificity of the regulator: cluster-containing IscR can bind to a family of gene promoters (type-1) whereas the clusterless form recognizes only a second group of sequences (type-2). However, iron-sulfur cluster biogenesis in Gram-positive bacteria is not so well characterized, and most organisms of this group display only one of the iron-sulfur cluster assembly systems. A notable exception is the unique Gram-positive dissimilatory metal reducing bacterium Thermincola potens, where genes from both systems could be identified, albeit with a diverging organization from that of Gram-negative bacteria. We demonstrated that one of these genes encodes a functional IscR homolog and is likely involved in the regulation of iron-sulfur cluster biogenesis in T. potens. Structural and biochemical characterization of T. potens and E. coli IscR revealed a strikingly similar architecture and unveiled an unforeseen conservation of the unique mechanism of sequence discrimination characteristic of this distinctive group of transcription regulators.


    Organizational Affiliation

    Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, 4150-180 Porto, Portugal; and ppereira@ibmc.up.pt sribeiro@ibmc.up.pt.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TRANSCRIPTIONAL REGULATOR, BADM/RRF2 FAMILYA, B153Thermincola potens JRMutation(s): 3 
Gene Names: TherJR_1914
Find proteins for D5X843 (Thermincola potens (strain JR))
Explore D5X843 
Go to UniProtKB:  D5X843
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HEXA-ALANINE PEPTIDEC [auth Q]6synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download Ideal Coordinates CCD File 
D [auth A], E [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.585α = 90
b = 53.585β = 90
c = 118.382γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
SHELXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-28
    Type: Initial release
  • Version 1.1: 2014-06-04
    Changes: Database references
  • Version 1.2: 2014-06-25
    Changes: Database references