1R94

Crystal Structure of IscA (MERCURY DERIVATIVE)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of the ancient, Fe-S scaffold IscA reveals a novel protein fold.

Bilder, P.W.Ding, H.Newcomer, M.E.

(2004) Biochemistry 43: 133-139

  • DOI: 10.1021/bi035440s
  • Primary Citation of Related Structures:  1R95

  • PubMed Abstract: 
  • IscA belongs to an ancient family of proteins responsible for iron-sulfur cluster assembly in essential metabolic pathways preserved throughout evolution. We report here the 2.3 A resolution crystal structure of Escherichia coli IscA, a novel fold in ...

    IscA belongs to an ancient family of proteins responsible for iron-sulfur cluster assembly in essential metabolic pathways preserved throughout evolution. We report here the 2.3 A resolution crystal structure of Escherichia coli IscA, a novel fold in which mixed beta-sheets form a compact alpha-beta sandwich domain. In contrast to the highly mobile secondary structural elements within the bacterial Fe-S scaffold protein IscU, a protein which is thought to have a similar function, the great majority of the amino acids that are conserved in IscA homologues are located in elements that constitute a well-ordered fold. However, the 10-residue C-terminal tail segment that contains two invariant cysteines critical for the Fe-S-binding function of a cyanobacterial (Synechocystis PCC) IscA homologue is not ordered in our structure. In addition, the crystal packing reveals a helical assembly that is constructed from two possible tetrameric oligomers of IscA.


    Organizational Affiliation

    Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein yfhF
A, B
118Escherichia coli (strain K12)Gene Names: iscA (yfhF)
Find proteins for P0AAC8 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AAC8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HG
Query on HG

Download SDF File 
Download CCD File 
A, B
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.229 
  • Space Group: P 62
Unit Cell:
Length (Å)Angle (°)
a = 55.337α = 90.00
b = 55.337β = 90.00
c = 159.835γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSphasing
MAR345data collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-12-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description