4MRB

Wild Type Human Transthyretin pH 7.5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.27 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Proteolytic cleavage of Ser52Pro variant transthyretin triggers its amyloid fibrillogenesis.

Mangione, P.P.Porcari, R.Gillmore, J.D.Pucci, P.Monti, M.Porcari, M.Giorgetti, S.Marchese, L.Raimondi, S.Serpell, L.C.Chen, W.Relini, A.Marcoux, J.Clatworthy, I.R.Taylor, G.W.Tennent, G.A.Robinson, C.V.Hawkins, P.N.Stoppini, M.Wood, S.P.Pepys, M.B.Bellotti, V.

(2014) Proc.Natl.Acad.Sci.USA 111: 1539-1544

  • DOI: 10.1073/pnas.1317488111
  • Primary Citation of Related Structures:  4MRC

  • PubMed Abstract: 
  • The Ser52Pro variant of transthyretin (TTR) produces aggressive, highly penetrant, autosomal-dominant systemic amyloidosis in persons heterozygous for the causative mutation. Together with a minor quantity of full-length wild-type and variant TTR, th ...

    The Ser52Pro variant of transthyretin (TTR) produces aggressive, highly penetrant, autosomal-dominant systemic amyloidosis in persons heterozygous for the causative mutation. Together with a minor quantity of full-length wild-type and variant TTR, the main component of the ex vivo fibrils was the residue 49-127 fragment of the TTR variant, the portion of the TTR sequence that previously has been reported to be the principal constituent of type A, cardiac amyloid fibrils formed from wild-type TTR and other TTR variants [Bergstrom J, et al. (2005) J Pathol 206(2):224-232]. This specific truncation of Ser52Pro TTR was generated readily in vitro by limited proteolysis. In physiological conditions and under agitation the residue 49-127 proteolytic fragment rapidly and completely self-aggregates into typical amyloid fibrils. The remarkable susceptibility to such cleavage is likely caused by localized destabilization of the β-turn linking strands C and D caused by loss of the wild-type hydrogen-bonding network between the side chains of residues Ser52, Glu54, Ser50, and a water molecule, as revealed by the high-resolution crystallographic structure of Ser52Pro TTR. We thus provide a structural basis for the recently hypothesized, crucial pathogenic role of proteolytic cleavage in TTR amyloid fibrillogenesis. Binding of the natural ligands thyroxine or retinol-binding protein (RBP) by Ser52Pro variant TTR stabilizes the native tetrameric assembly, but neither protected the variant from proteolysis. However, binding of RBP, but not thyroxine, inhibited subsequent fibrillogenesis.


    Organizational Affiliation

    Wolfson Drug Discovery Unit, Centre for Amyloidosis and Acute Phase Proteins, Division of Medicine, Laboratory of Protein Crystallography, Centre for Amyloidosis and Acute Phase Proteins, and Electron Microscopy Unit, University College London, London NW3 2PF, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transthyretin
A, B
127Homo sapiensGene Names: TTR (PALB)
Find proteins for P02766 (Homo sapiens)
Go to Gene View: TTR
Go to UniProtKB:  P02766
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.27 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 84.210α = 90.00
b = 41.320β = 90.00
c = 63.010γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
GDAdata collection
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-09-17 
  • Released Date: 2014-01-08 
  • Deposition Author(s): Chen, W.J., Wood, S.P.

Revision History 

  • Version 1.0: 2014-01-08
    Type: Initial release
  • Version 1.1: 2014-01-15
    Type: Database references
  • Version 1.2: 2014-02-26
    Type: Database references