6NJ8

Encapsulin iron storage compartment from Quasibacillus thermotolerans


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.85 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Large protein organelles form a new iron sequestration system with high storage capacity.

Giessen, T.W.Orlando, B.J.Verdegaal, A.A.Chambers, M.G.Gardener, J.Bell, D.C.Birrane, G.Liao, M.Silver, P.A.

(2019) Elife 8

  • DOI: 10.7554/eLife.46070
  • Primary Citation of Related Structures:  
    6NJ8, 6N63

  • PubMed Abstract: 
  • Iron storage proteins are essential for cellular iron homeostasis and redox balance. Ferritin proteins are the major storage units for bioavailable forms of iron. Some organisms lack ferritins, and it is not known how they store iron. Encapsulins, a class of protein-based organelles, have recently been implicated in microbial iron and redox metabolism ...

    Iron storage proteins are essential for cellular iron homeostasis and redox balance. Ferritin proteins are the major storage units for bioavailable forms of iron. Some organisms lack ferritins, and it is not known how they store iron. Encapsulins, a class of protein-based organelles, have recently been implicated in microbial iron and redox metabolism. Here, we report the structural and mechanistic characterization of a 42 nm two-component encapsulin-based iron storage compartment from Quasibacillus thermotolerans . Using cryo-electron microscopy and x-ray crystallography, we reveal the assembly principles of a thermostable T = 4 shell topology and its catalytic ferroxidase cargo and show interactions underlying cargo-shell co-assembly. This compartment has an exceptionally large iron storage capacity storing over 23,000 iron atoms. Our results reveal a new approach for survival in diverse habitats with limited or fluctuating iron availability via an iron storage system able to store 10 to 20 times more iron than ferritin.


    Organizational Affiliation

    Department of Systems Biology, Harvard Medical School, Boston, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Encapsulating protein for a DyP-type peroxidaseA, B, C, D282Quasibacillus thermotoleransMutation(s): 0 
Gene Names: QY95_01592
UniProt
Find proteins for A0A0F5HPP7 (Quasibacillus thermotolerans)
Explore A0A0F5HPP7 
Go to UniProtKB:  A0A0F5HPP7
Protein Feature View
Expand
  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
targeting peptideE, F, G7Quasibacillus thermotoleransMutation(s): 0 
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.85 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Federal Ministry for Education and ResearchGermanyLPDS 2014-05

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Database references
  • Version 1.2: 2019-12-18
    Changes: Other