1PY4

Beta2 microglobulin mutant H31Y displays hints for amyloid formations


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

beta2-microglobulin H31Y variant 3D structure highlights the protein natural propensity towards intermolecular aggregation

Rosano, C.Zuccotti, S.Mangione, P.Giorgetti, S.Bellotti, V.Pettirossi, F.Corazza, A.Viglino, P.Esposito, G.Bolognesi, M.

(2004) J.Mol.Biol. 335: 1051-1064


  • PubMed Abstract: 
  • beta2-Microglobulin (beta2m) is the non-covalently bound light chain of the human class I major histocompatibility complex (MHC-I). The natural turnover of MHC-I gives rise to the release of beta2m into plasmatic fluids and to its catabolism in the k ...

    beta2-Microglobulin (beta2m) is the non-covalently bound light chain of the human class I major histocompatibility complex (MHC-I). The natural turnover of MHC-I gives rise to the release of beta2m into plasmatic fluids and to its catabolism in the kidney. beta2m dissociation from the heavy chain of the complex is a severe complication in patients receiving prolonged hemodialysis. As a consequence of renal failure, the increasing beta2m concentrations can lead to deposition of the protein as amyloid fibrils. Here we characterize the His31-->Tyr human beta2m mutant, a non-natural form of beta2m that is more stable than the wild-type protein, displaying a ten-fold acceleration of the slow phase of folding. We report the 2.9A resolution crystal structure and the NMR characterization of the mutant beta2m, focussing on selected structural features and on the molecular packing observed in the crystals. Juxtaposition of the four mutant beta2m molecules contained in the crystal asymmetric unit, and specific hydrogen bonds, stabilize a compact protein assembly. Conformational heterogeneity of the four independent molecules, some of their mutual interactions and partial unpairing of the N-terminal beta-strand in one protomer are in keeping with the amyloidogenic properties displayed by the mutant beta2m.


    Organizational Affiliation

    Istituto Nazionale Ricerca sul Cancro-IST, X-ray Structural Biology Unit, Largo Rosanno Benzi 10, 16132 Genova, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin precursor
A, B, C, D
100Homo sapiensGene 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: 2.9 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.240 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 105.195α = 90.00
b = 150.166β = 90.00
c = 93.671γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
AMoREphasing
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-05-04
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance