1BG7

LOCALIZED UNFOLDING AT THE JUNCTION OF THREE FERRITIN SUBUNITS. A MECHANISM FOR IRON RELEASE?


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Localized unfolding at the junction of three ferritin subunits. A mechanism for iron release?

Takagi, H.Shi, D.Ha, Y.Allewell, N.M.Theil, E.C.

(1998) J.Biol.Chem. 273: 18685-18688

  • DOI: 10.1074/jbc.273.30.18685

  • PubMed Abstract: 
  • How and where iron exits from ferritin for cellular use is unknown. Twenty-four protein subunits create a cavity in ferritin where iron is concentrated >10(11)-fold as a mineral. Proline substitution for conserved leucine 134 (L134P) allowed normal a ...

    How and where iron exits from ferritin for cellular use is unknown. Twenty-four protein subunits create a cavity in ferritin where iron is concentrated >10(11)-fold as a mineral. Proline substitution for conserved leucine 134 (L134P) allowed normal assembly but increased iron exit rates. X-ray crystallography of H-L134P ferritin revealed localized unfolding at the 3-fold axis, also iron entry sites, consistent with shared use sites for iron exit and entry. The junction of three ferritin subunits appears to be a dynamic aperture with a "shutter" that cytoplasmic factors might open or close to regulate iron release in vivo.


    Organizational Affiliation

    Department of Biochemistry, North Carolina State University, Raleigh, North Carolina 27695-7622, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FERRITIN
A
176Lithobates catesbeianaMutation(s): 2 
EC: 1.16.3.1
Find proteins for P07229 (Lithobates catesbeiana)
Go to UniProtKB:  P07229
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.207 
  • Space Group: F 4 3 2
Unit Cell:
Length (Å)Angle (°)
a = 182.800α = 90.00
b = 182.800β = 90.00
c = 182.800γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model