6ic3

AL amyloid fibril from a lambda 1 light chainAL amyloid fibril from a lambda 1 light chain

6ic3, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Structural highlights 6ic3 is a 8 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Amyloid fibrils derived from antibody light chains are key pathogenic agents in systemic AL amyloidosis. They can be deposited in multiple organs but cardiac amyloid is the major risk factor of mortality. Here we report the structure of a lambda1 AL amyloid fibril from an explanted human heart at a resolution of 3.3 A which we determined using cryo-electron microscopy. The fibril core consists of a 91-residue segment presenting an all-beta fold with ten mutagenic changes compared to the germ line. The conformation differs substantially from natively folded light chains: a rotational switch around the intramolecular disulphide bond being the crucial structural rearrangement underlying fibril formation. Our structure provides insight into the mechanism of protein misfolding and the role of patient-specific mutations in pathogenicity. Cryo-EM structure of a light chain-derived amyloid fibril from a patient with systemic AL amyloidosis.,Radamaker L, Lin YH, Annamalai K, Huhn S, Hegenbart U, Schonland SO, Fritz G, Schmidt M, Fandrich M Nat Commun. 2019 Mar 20;10(1):1103. doi: 10.1038/s41467-019-09032-0. PMID:30894526 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.