2X89

Structure of the Beta2_microglobulin involved in amyloidogenesis

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.238 

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This is version 1.1 of the entry. See complete history. 

Literature

Atomic Structure of a Nanobody-Trapped Domain-Swapped Dimer of an Amyloidogenic {Beta}2-Microglobulin Variant.

Domanska, K., Vanderhaegen, S., Srinivasan, V., Pardon, E., Dupeux, F., Marquez, J.A., Giorgetti, S., Stoppini, M., Wyns, L., Bellotti, V., Steyaert, J.

(2011) Proc.Natl.Acad.Sci.USA 108: 1314

  • DOI: 10.1073/pnas.1008560108

  • PubMed Abstract: 

    • Atomic-level structural investigation of the key conformational intermediates of amyloidogenesis remains a challenge. Here we demonstrate the utility of nanobodies to trap and characterize intermediates of β2-microglobulin (β2m) amyloidogenesis by X- ...

    Atomic-level structural investigation of the key conformational intermediates of amyloidogenesis remains a challenge. Here we demonstrate the utility of nanobodies to trap and characterize intermediates of β2-microglobulin (β2m) amyloidogenesis by X-ray crystallography. For this purpose, we selected five single domain antibodies that block the fibrillogenesis of a proteolytic amyloidogenic fragment of β2m (ΔN6β2m). The crystal structure of ΔN6β2m in complex with one of these nanobodies (Nb24) identifies domain swapping as a plausible mechanism of self-association of this amyloidogenic protein. In the swapped dimer, two extended hinge loops--corresponding to the heptapetide NHVTLSQ that forms amyloid in isolation--are unmasked and fold into a new two-stranded antiparallel β-sheet. The β-strands of this sheet are prone to self-associate and stack perpendicular to the direction of the strands to build large intermolecular β-sheets that run parallel to the axis of growing oligomers, providing an elongation mechanism by self-templated growth.

    Organizational Affiliation: 

    Department of Molecular and Cellular Interactions, Vlaams Instituut voor Biotechnologie, Pleinlaan 2, B-1050 Brussels, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTIBODY
A, B, C
128Lama glamaMutation(s): 0 
Gene Names: r2
Find proteins for A2KD59 (Lama glama)
Go to UniProtKB:  A2KD59
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BETA-2-MICROGLOBULIN
D, E, F, G
94Homo sapiensMutation(s): 0 
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: 2.16 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.238 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 77.490α = 90.00
b = 100.864β = 106.43
c = 83.743γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKLdata reduction
PHASERphasing
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2013-09-04
    Type: Derived calculations, Other, Refinement description, Source and taxonomy, Version format compliance