1b0w

Structural comparison of amyloidogenic light chain dimer in two crystal forms with nonamyloidogenic counterparts

spinqualitylabelsall models 1b0w, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1b0w is a 3 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1bre Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The most common form of hereditary systemic amyloidosis is familial amyloidotic polyneuropathy associated with single amino acid changes in the plasma protein transthyretin. So far, high resolution structures of only three amyloidogenic variants (Met30, Ser84, Ile122) and one non-amyloidogenic variant (Thr109) have been reported complemented by X-ray fiber diffraction studies and image reconstruction from electron micrographs of amyloid fibrils. To investigate the role of structural factors in this disease, we extended our studies to other transthyretin variants. We report crystallization and structural investigations of three amyloidogenic (Arg10, Ala60, Tyr77) and two non-amyloidogenic variants (Ser6, Met119). The similarity of these structures to normal transthyretin does not give direct clues to the fibril forming process. Since transthyretin amyloid fibrils contain a major fragment starting at position 49, besides the intact molecule, we calculated the solvent accessibility of residue 48. Indeed, all amyloidogenic variants show an increased main chain solvent exposure when compared to normal transthyretin and non-amyloidogenic variants, which can be postulated to result in increased susceptibility to proteolysis. After limited proteolysis, dimers are incapable of reassociation to native tetramers. We present a model for amyloid fibril formation based on formation of fibrils from N-terminal truncated dimers as building blocks. Tertiary structures of amyloidogenic and non-amyloidogenic transthyretin variants: new model for amyloid fibril formation.,Schormann N, Murrell JR, Benson MD Amyloid. 1998 Sep;5(3):175-87. PMID:9818054 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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