Biological Assembly 1  

Global Symmetry: Octahedral - O  (3D View)
Global Stoichiometry: Homo 24-mer - A24 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 160.76 kDa 
• Atom Count: 11,921 
• Modelled Residue Count: 1,312 
• Deposited Residue Count: 1,312 
• Unique protein chains: 1

 6TXL

Crystal structure of thermotoga maritima E65Q Ferritin

• PDB DOI: 10.2210/pdb6TXL/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Thermotoga maritima MSB8
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2020-01-14 Released: 2021-07-28 
• Deposition Author(s): Wilk, P., Grudnik, P., Kumar, M., Heddle, J., Chakraborti, S.
• Funding Organization(s): Foundation for Polish Science

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.222 
• R-Value Work: 0.193 
• R-Value Observed: 0.193 

Literature

A single residue can modulate nanocage assembly in salt dependent ferritin.

Kumar, M., Markiewicz-Mizera, J., Janna Olmos, J.D., Wilk, P., Grudnik, P., Biela, A.P., Jemiola-Rzeminska, M., Gorecki, A., Chakraborti, S., Heddle, J.G.

(2021) Nanoscale 13: 11932-11942

• PubMed: 34195748 
• DOI: 10.1039/d1nr01632f
• Primary Citation of Related Structures:  
  6TXH, 6TXI, 6TXJ, 6TXK, 6TXL, 6TXM, 6TXN


• PubMed Abstract: 
  

Cage forming proteins have numerous potential applications in biomedicine and biotechnology, where the iron storage ferritin is a widely used example. However, controlling ferritin cage assembly/disassembly remains challenging, typically requiring extreme conditions incompatible with many desirable cargoes, particularly for more fragile biopharmaceuticals. Recently, a ferritin from the hyperthermophile bacterium Thermotoga maritima (TmFtn) has been shown to have reversible assembly under mild conditions, offering greater potential biocompatibility in terms of cargo access and encapsulation. Like Archeoglobus fulgidus ferritin (AfFtn), TmFtn forms 24mer cages mediated by metal ions (Mg2+). We have solved the crystal structure of the wild type TmFtn and several mutants displaying different assembly/disassembly properties. These data combined with other biophysical studies allow us to suggest candidate interfacial amino acids crucial in controlling assembly. This work deepens our understanding of how these ferritin complexes assemble and is a useful step towards production of triggerable ferritins in which these properties can be finely designed and controlled.

---

Organizational Affiliation: 

Malopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7A, 30-392 Krakow, Poland. [e-mail] [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ferritin	A, B, C, D, E, F, G, H	164	Thermotoga maritima MSB8	Mutation(s): 1  Gene Names: TM_1128 EC: 1.16.3.2
UniProt
Find proteins for Q9X0L2 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8)) Explore Q9X0L2  Go to UniProtKB:  Q9X0L2

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
LFA	EA [auth C], IB [auth H], SA [auth E], X [auth B]	EICOSANE C20 H42 CBFCDTFDPHXCNY-UHFFFAOYSA-N
SO4	AA [auth B], BB [auth G], CB [auth G], DB [auth G], FA [auth C], FB [auth H], GA [auth C], HA [auth C], J [auth A], JA [auth D], JB [auth H], MA [auth D], N [auth A], NA [auth D], O [auth A], OA [auth D], P [auth A], Q [auth A], QA [auth E], S [auth B], T [auth B], TA [auth E], V [auth B], VA [auth F], XA [auth F], Y [auth B], Z [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	AB [auth G], CA [auth C], DA [auth C], GB [auth H], HB [auth H], K [auth A], KA [auth D], L [auth A], LA [auth D], M [auth A], RA [auth E], U [auth B], W [auth B], WA [auth F], ZA [auth G]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
FE	BA [auth C], EB [auth H], I [auth A], IA [auth D], PA [auth E], R [auth B], UA [auth F], YA [auth G]	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.222 
• R-Value Work: 0.193 
• R-Value Observed: 0.193 
• Space Group: H 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 176.219	α = 90
b = 176.219	β = 90
c = 355.045	γ = 120

Software Package:

Software Name	Purpose
XSCALE	data scaling
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
XDS	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2021-07-28 
Deposition Author(s): Wilk, P., Grudnik, P., Kumar, M., Heddle, J., Chakraborti, S.

---

Funding Organization	Location	Grant Number
Foundation for Polish Science	Poland	Homing/2017-3/22

Revision History  

• Version 1.0: 2021-07-28
  Type: Initial release
  
• Version 1.1: 2022-08-10
  Changes: Database references