1LDS image
Entry Detail
PDB ID:
1LDS
Keywords:
Title:
Crystal Structure of monomeric human beta-2-microglobulin
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2002-04-09
Release Date:
2002-07-31
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.23
R-Value Work:
0.18
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:beta-2-microglobulin
Chain IDs:A
Chain Length:100
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Crystal structure of monomeric human beta-2-microglobulin reveals clues to its amyloidogenic properties.
Proc.Natl.Acad.Sci.USA 99 9771 9776 (2002)
PMID: 12119416 DOI: 10.1073/pnas.152337399

Abstact

Dissociation of human beta-2-microglobulin (beta(2)m) from the heavy chain of the class I HLA complex is a critical first step in the formation of amyloid fibrils from this protein. As a consequence of renal failure, the concentration of circulating monomeric beta(2)m increases, ultimately leading to deposition of the protein into amyloid fibrils and development of the disorder, dialysis-related amyloidosis. Here we present the crystal structure of a monomeric form of human beta(2)m determined at 1.8-A resolution that reveals remarkable structural changes relative to the HLA-bound protein. These involve the restructuring of a beta bulge that separates two short beta strands to form a new six-residue beta strand at one edge of this beta sandwich protein. These structural changes remove key features proposed to have evolved to protect beta sheet proteins from aggregation [Richardson, J. & Richardson, D. (2002) Proc. Natl. Acad. Sci. USA 99, 2754-2759] and replaces them with an aggregation-competent surface. In combination with solution studies using (1)H NMR, we show that the crystal structure presented here represents a rare species in solution that could provide important clues about the mechanism of amyloid formation from the normally highly soluble native protein.

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