6HUD image
Entry Detail
PDB ID:
6HUD
EMDB ID:
Keywords:
Title:
Cryo-EM structure of cardiac amyloid fibrils from an immunoglobulin light chain (AL) amyloidosis patient.
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2018-10-06
Release Date:
2019-03-27
Method Details:
Experimental Method:
Resolution:
4.00 Å
Aggregation State:
FILAMENT
Reconstruction Method:
HELICAL
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Monoclonal immunoglobulin light chains (LC)
Chain IDs:A, B, C, D, E
Chain Length:136
Number of Molecules:5
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Cryo-EM structure of cardiac amyloid fibrils from an immunoglobulin light chain AL amyloidosis patient.
Nat Commun 10 1269 1269 (2019)
PMID: 30894521 DOI: 10.1038/s41467-019-09133-w

Abstact

Systemic light chain amyloidosis (AL)  is a life-threatening disease caused by aggregation and deposition of monoclonal immunoglobulin light chains (LC) in target organs. Severity of heart involvement is the most important factor determining prognosis. Here, we report the 4.0 Å resolution cryo-electron microscopy map and molecular model of amyloid fibrils extracted from the heart of an AL amyloidosis patient with severe amyloid cardiomyopathy. The helical fibrils are composed of a single protofilament, showing typical 4.9 Å stacking and cross-β architecture. Two distinct polypeptide stretches (total of 77 residues) from the LC variable domain (Vl) fit the fibril density. Despite Vl high sequence variability, residues stabilizing the fibril core are conserved through different cardiotoxic Vl, highlighting structural motifs that may be common to misfolding-prone LCs. Our data shed light on the architecture of LC amyloids, correlate amino acid sequences with fibril assembly, providing the grounds for development of innovative medicines.

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Primary Citation of related structures