1Z6O

Crystal Structure of Trichoplusia ni secreted ferritin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a secreted insect ferritin reveals a symmetrical arrangement of heavy and light chains.

Hamburger, A.E.West, A.P.Hamburger, Z.A.Hamburger, P.Bjorkman, P.J.

(2005) J Mol Biol 349: 558-569

  • DOI: 10.1016/j.jmb.2005.03.074
  • Primary Citation of Related Structures:  
    1Z6O

  • PubMed Abstract: 
  • Ferritins are iron storage proteins made of 24 subunits forming a hollow spherical shell. Vertebrate ferritins contain varying ratios of heavy (H) and light (L) chains; however, known ferritin structures include only one type of chain and have octahe ...

    Ferritins are iron storage proteins made of 24 subunits forming a hollow spherical shell. Vertebrate ferritins contain varying ratios of heavy (H) and light (L) chains; however, known ferritin structures include only one type of chain and have octahedral symmetry. Here, we report the 1.9A structure of a secreted insect ferritin from Trichoplusia ni, which reveals equal numbers of H and L chains arranged with tetrahedral symmetry. The H/L-chain interface includes complementary features responsible for ordered assembly of the subunits. The H chain contains a ferroxidase active site resembling that of vertebrate H chains with an endogenous, bound iron atom. The L chain lacks the residues that form a putative iron core nucleation site in vertebrate L chains. Instead, a possible nucleation site is observed at the L chain 3-fold pore. The structure also reveals inter- and intrasubunit disulfide bonds, mostly in the extended N-terminal regions unique to insect ferritins. The symmetrical arrangement of H and L chains and the disulfide crosslinks reflect adaptations of insect ferritin to its role as a secreted protein.


    Organizational Affiliation

    Division of Biology 114-96, California Institute of Technology, Pasadena, CA 91125, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ferritin light chainABCDEFGHIJKL212Trichoplusia niMutation(s): 0 
EC: 1.16.3.1
Find proteins for Q52SA8 (Trichoplusia ni)
Explore Q52SA8 
Go to UniProtKB:  Q52SA8
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ferritin heavy chainMNOPQRSTUVWX191Trichoplusia niMutation(s): 0 
EC: 1.16.3.1
Find proteins for Q52SA9 (Trichoplusia ni)
Explore Q52SA9 
Go to UniProtKB:  Q52SA9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download CCD File 
A, B, C, F, M, N, O, P, Q, R, S, T, U, V, W, X
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A, B, C, F
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 206.88α = 90
b = 145.697β = 94.93
c = 209.158γ = 90
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
DENZOdata reduction
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-05-24
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance