5LP3

Three tetrameric rings of Isoaspartyl Dipeptidase fitted in an EM volume.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.5 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Proteins evolve on the edge of supramolecular self-assembly.

Garcia-Seisdedos, H.Empereur-Mot, C.Elad, N.Levy, E.D.

(2017) Nature 548: 244-247

  • DOI: 10.1038/nature23320

  • PubMed Abstract: 
  • The self-association of proteins into symmetric complexes is ubiquitous in all kingdoms of life. Symmetric complexes possess unique geometric and functional properties, but their internal symmetry can pose a risk. In sickle-cell disease, the symmetry ...

    The self-association of proteins into symmetric complexes is ubiquitous in all kingdoms of life. Symmetric complexes possess unique geometric and functional properties, but their internal symmetry can pose a risk. In sickle-cell disease, the symmetry of haemoglobin exacerbates the effect of a mutation, triggering assembly into harmful fibrils. Here we examine the universality of this mechanism and its relation to protein structure geometry. We introduced point mutations solely designed to increase surface hydrophobicity among 12 distinct symmetric complexes from Escherichia coli. Notably, all responded by forming supramolecular assemblies in vitro, as well as in vivo upon heterologous expression in Saccharomyces cerevisiae. Remarkably, in four cases, micrometre-long fibrils formed in vivo in response to a single point mutation. Biophysical measurements and electron microscopy revealed that mutants self-assembled in their folded states and so were not amyloid-like. Structural examination of 73 mutants identified supramolecular assembly hot spots predictable by geometry. A subsequent structural analysis of 7,471 symmetric complexes showed that geometric hot spots were buffered chemically by hydrophilic residues, suggesting a mechanism preventing mis-assembly of these regions. Thus, point mutations can frequently trigger folded proteins to self-assemble into higher-order structures. This potential is counterbalanced by negative selection and can be exploited to design nanomaterials in living cells.


    Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Isoaspartyl dipeptidase
B, C, D, E, A, F, G, H, I, J, K, L
390Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: iadA (yjiF)
EC: 3.4.19.-
Find proteins for P39377 (Escherichia coli (strain K12))
Go to UniProtKB:  P39377
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
KCX
Query on KCX
A, B, C, D, E, F, G, H, I, J, K, L
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.5 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-08-16
    Type: Database references
  • Version 1.2: 2017-08-23
    Type: Database references