3DHM

Beta 2 microglobulin mutant D59P


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

DE loop mutations affect beta2-microglobulin stability and amyloid aggregation

Ricagno, S.Colombo, M.de Rosa, M.Sangiovanni, E.Giorgetti, S.Raimondi, S.Bellotti, V.Bolognesi, M.

(2008) Biochem.Biophys.Res.Commun. 377: 146-150

  • DOI: 10.1016/j.bbrc.2008.09.108
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Beta2-microglobulin (beta2m) is the light chain component of class I major histocompatibility complex (MHC-I). beta2m is an intrinsically amyloidogenic protein that can assemble into amyloid fibrils in vitro and in vivo. Several recent reports sugges ...

    Beta2-microglobulin (beta2m) is the light chain component of class I major histocompatibility complex (MHC-I). beta2m is an intrinsically amyloidogenic protein that can assemble into amyloid fibrils in vitro and in vivo. Several recent reports suggested that the polypeptide loop comprised between beta-strands D and E of beta2m is important for protein stability and for the protein propensity to aggregate as amyloid fibrils. In particular, the roles of Trp60 for MHC-I assembly and beta2m stability have been highlighted by showing that the beta2m Trp60-->Gly mutant is more stable and less prone to aggregation than the wild type protein. To further analyse such properties, the Trp60-->Cys and Asp59-->Pro beta2m mutants have been expressed, purified, and their crystal structures determined. The stability to thermal denaturation and propensity to fibrillar aggregation have also been analysed. The experimental evidences gathered on the two mutants reinforce the hypothesis that conformational strain in the DE loop can affect beta2m stability and amyloid aggregation properties.


    Organizational Affiliation

    Department of Biomolecular Sciences and Biotechnology, CNR-INFM and CIMAINA, University of Milano, Milano, 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: 1.8 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 78.186α = 90.00
b = 29.189β = 121.45
c = 55.323γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
SCALAdata scaling
MxCuBEdata collection
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-11-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance