1TTR

TRANSTHYRETIN-V/122/I CARDIOMYOPATHIC MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.158 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Val122Ile variant transthyretin - a cardiomyopathic mutant.

Damas, A.M.Ribeiro, S.Lamzin, V.S.Palha, J.A.Saraiva, M.J.

(1996) Acta Crystallogr.,Sect.D 52: 966-972

  • DOI: 10.1107/S0907444996003307

  • PubMed Abstract: 
  • The Val122Ile mutant transthyretin (TTR Ile122) is an amyloidogenic protein which has been described as the major protein component of amyloid fibrils isolated from patients with familial amyloidotic cardiomyopathy (FAC), a disease characterized by c ...

    The Val122Ile mutant transthyretin (TTR Ile122) is an amyloidogenic protein which has been described as the major protein component of amyloid fibrils isolated from patients with familial amyloidotic cardiomyopathy (FAC), a disease characterized by cardiac failure and amyloid deposits in the heart. The reasons for the deposition of TTR are still unknown and it is conceivable that a conformational alteration, resulting from the mutation, is fundamental for amyloid formation. The three-dimensional structure of TTR Ile122 was determined and refined to a crystallographic R factor of 15.8% at 1.9 A resolution. The r.m.s. deviation from ideality in bond distances is 0.019 A and in angle-bonded distances is 0.027 A. The presence of two crystallographically independent monomers in the asymmetric unit allowed additional means of estimation of atomic coordinate error. The structure of the mutant is essentially identical to that of the wild-type transthyretin (TTR). The largest deviations occur in surface loops and in the region of the substitution. The protein is a tetramer composed of identical subunits; each monomer has two four-stranded beta-sheets which are extended to eight-stranded beta-sheets when two monomers associate through hydrogen bonds forming a dimer, which is the crystallographic asymmetric unit. The replacement of valine for isoleucine introduces very small alterations in relation to the wild-type protein; nevertheless they seem to confirm a tendency for a less stable tetrameric structure. This would support the idea that the tetrameric structure might be disrupted in amyloid fibrils.


    Related Citations: 
    • The X-Ray Crystal Structure Refinements of Normal Human Transthyretin and the Amyloidogenic Val-30-->met Variant to 1.7-A Resolution
      Hamilton, J.A.,Steinrauf, L.K.,Braden, B.C.,Liepnieks, J.,Benson, M.D.,Holmgren, G.,Sandgren, O.,Steen, L.
      (1993) J.Biol.Chem. 268: 2416


    Organizational Affiliation

    Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Portugal. amdamas@ncc.up.pt




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSTHYRETIN
A, B
127Homo sapiensMutations: I122V
Gene Names: TTR (PALB)
Find proteins for P02766 (Homo sapiens)
Go to Gene View: TTR
Go to UniProtKB:  P02766
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.158 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 43.230α = 90.00
b = 85.640β = 90.00
c = 65.500γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CCP4model building
CCP4refinement
DENZOdata reduction
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-10-14
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance