4PWQ

HIGH-RESOLUTION CRYSTAL STRUCTURE OF THE E1-DOMAIN of THE AMYLOID PRECURSOR PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.155 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The Amyloid Precursor Protein Shows a pH-Dependent Conformational Switch in Its E1 Domain.

Hoefgen, S.Dahms, S.O.Oertwig, K.Than, M.E.

(2015) J.Mol.Biol. 427: 433-442

  • DOI: 10.1016/j.jmb.2014.12.005

  • PubMed Abstract: 
  • The amyloid precursor protein (APP) and its proteolytic cleavage product Aβ are widely believed to be central to the etiology of Alzheimer's disease (AD). APP and its family members are also essential for proper neuronal development and homeostasis. ...

    The amyloid precursor protein (APP) and its proteolytic cleavage product Aβ are widely believed to be central to the etiology of Alzheimer's disease (AD). APP and its family members are also essential for proper neuronal development and homeostasis. APP is located at the cell surface and within intracellular compartments, cellular regions that exhibit different pH values. The AD-associated amyloidogenic processing of APP is initiated predominantly in intracellular acidic compartments, whereas its non-amyloidogenic cleavage is initiated at the cell surface at slightly basic pH. We analyzed the influence of pH on the APP-E1 domain and found that its two constituting subdomains, GFLD and CuBD, interact with each other in a pH-dependent manner. Dynamic light scattering showed that APP-E1 represents a more open conformation at neutral pH and a more closed conformation at acidic pH. Analyzing a 1.4 Å, high-resolution X-ray structure of E1 derived from merohedrally twinned crystals resulted in the identification of individual residues that are responsible for these pH-dependent interactions. Mutational studies and dynamic light scattering measurements further proved that specific hydrogen bonds between the two carboxylates of D177 and E87, as well as between N89 and H147, are major determinants of this pH-driven conformational switch in APP-E1. These findings show how APP can adopt different conformations depending on pH and suggest that the protein fulfils different functions at distinct localizations within the cell. Additionally, our data suggest a novel strategy for treating AD based on regulating the amyloidogenic processing of APP by the specific interruption of the interaction between the APP-E1 subdomains.


    Organizational Affiliation

    Protein Crystallography Group, Leibniz Institute for Age Research, Fritz Lipmann Institute (FLI), Beutenbergstrasse 11, 07745 Jena, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Amyloid beta A4 protein
B, A
191Homo sapiensMutation(s): 0 
Gene Names: APP (A4, AD1)
Find proteins for P05067 (Homo sapiens)
Go to Gene View: APP
Go to UniProtKB:  P05067
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.155 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 91.400α = 90.00
b = 91.400β = 90.00
c = 80.016γ = 120.00
Software Package:
Software NamePurpose
XDSdata scaling
PHENIXrefinement
XDSdata reduction
PHASERphasing
MxCuBEdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-04
    Type: Initial release