4RAH

Crystal structure of dimeric S33C beta-2 microglobulin mutant at 1.4 Angstrom resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 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

A covalent homodimer probing early oligomers along amyloid aggregation.

Halabelian, L.Relini, A.Barbiroli, A.Penco, A.Bolognesi, M.Ricagno, S.

(2015) Sci Rep 5: 14651-14651

  • DOI: 10.1038/srep14651
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Early oligomers are crucial in amyloid aggregation; however, due to their transient nature they are among the least structurally characterized species. We focused on the amyloidogenic protein beta2-microglobulin (β2m) whose early oligomers are still ...

    Early oligomers are crucial in amyloid aggregation; however, due to their transient nature they are among the least structurally characterized species. We focused on the amyloidogenic protein beta2-microglobulin (β2m) whose early oligomers are still a matter of debate. An intermolecular interaction between D strands of facing β2m molecules was repeatedly observed, suggesting that such interface may be relevant for β2m dimerization. In this study, by mutating Ser33 to Cys, and assembling the disulphide-stabilized β2m homodimer (DimC33), such DD strand interface was locked. Although the isolated DimC33 display a stability similar to wt β2m under native conditions, it shows enhanced amyloid aggregation propensity. Three distinct crystal structures of DimC33 suggest that dimerization through the DD interface is instrumental for enhancing DimC33 aggregation propensity. Furthermore, the crystal structure of DimC33 in complex with the amyloid-specific dye Thioflavin-T pinpoints a second interface, which likely participates in the first steps of β2m aggregation. The present data provide new insight into β2m early steps of amyloid aggregation.


    Organizational Affiliation

    Dipartimento di Scienze per gli Alimenti, la Nutrizione e l'Ambiente, Università degli Studi di Milano, via Celoria 2, 20133 Milan, Italy.,CIMAINA e Istituto CNR di Biofisica, Milano, Italy.,Dipartimento di Bioscienze, Università degli Studi di Milano, Via Celoria 26, 20133 Milan, Italy.,Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
A
100Homo sapiensMutation(s): 1 
Gene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 32.349α = 90.00
b = 47.704β = 90.00
c = 119.650γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
MxCuBEdata collection
REFMACrefinement
Aimlessdata scaling
BALBESphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-09-16
    Type: Initial release
  • Version 1.1: 2015-09-23
    Type: Database references
  • Version 1.2: 2015-11-04
    Type: Database references