2QEL

Crystal structure of the highly amyloidogenic transthyretin mutant TTR G53S/E54D/L55S- heated protein

• PDB DOI: https://doi.org/10.2210/pdb2QEL/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2007-06-26 Released: 2007-09-04 
• Deposition Author(s): Karlsson, A., Sauer-Eriksson, A.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.29 Å
• R-Value Free: 0.289 
• R-Value Work: 0.231 
• R-Value Observed: 0.234 

Starting Model: experimental

Literature

Heating of proteins as a means of improving crystallization: a successful case study on a highly amyloidogenic triple mutant of human transthyretin

Karlsson, A., Sauer-Eriksson, A.E.

(2007) Acta Crystallogr Sect F Struct Biol Cryst Commun 63: 695-700

• PubMed: 17671371 
• DOI: https://doi.org/10.1107/S1744309107033957
• Primary Citation of Related Structures:  
  2QEL


• PubMed Abstract: 
  

  The use of high temperatures in the purification procedures of heat-stable proteins is a well established technique. Recently, rapid pre-heat treatment of protein samples prior to crystallization trials was described as a final polishing step to improve the diffraction properties of crystals [Pusey et al. (2005), Prog. Biophys. Mol. Biol. 88, 359-386]. The present study demonstrates that extended high-temperature incubation (328 K for 48 h) of the highly amyloidogenic transthyretin mutant TTR G53S/E54D/L55S successfully removes heterogeneities and allows the reproducible growth of well diffracting crystals. Heat treatment might be applied as an optimization method to other cases in which the protein/biomolecule fails to form diffracting crystals.

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Organizational Affiliation: 

Umeå Centre for Molecular Pathogenesis, Umeå University, SE-901 87 Umeå, Sweden.

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 55.07 kDa 
• Atom Count: 3,633 
• Modelled Residue Count: 459 
• Deposited Residue Count: 508 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transthyretin	A, B, C, D	127	Homo sapiens	Mutation(s): 3  Gene Names: TTR, PALB
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens) Explore P02766  Go to UniProtKB:  P02766
PHAROS:  P02766 GTEx:  ENSG00000118271

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.29 Å
• R-Value Free: 0.289 
• R-Value Work: 0.231 
• R-Value Observed: 0.234 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.36	α = 90
b = 58.36	β = 90
c = 229.16	γ = 120

Software Package:

Software Name	Purpose
SCALA	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-09-04 
Deposition Author(s): Karlsson, A., Sauer-Eriksson, A.E.

Revision History  

• Version 1.0: 2007-09-04
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2018-03-07
  Changes: Data collection
• Version 1.3: 2021-10-20
  Changes: Database references
• Version 1.4: 2023-08-30
  Changes: Data collection, Refinement description