The beta-slip: a novel concept in transthyretin amyloidosis.Eneqvist, T., Andersson, K., Olofsson, A., Lundgren, E., Sauer-Eriksson, A.E.
(2000) Mol Cell 6: 1207-1218
- PubMed: 11106758
- DOI: https://doi.org/10.1016/s1097-2765(00)00117-9
- Primary Citation of Related Structures:
- PubMed Abstract:
Transthyretin is a tetrameric plasma protein associated with two forms of amyloid disease. The structure of the highly amyloidogenic transthyretin triple mutant TTRG53S/E54D/L55S determined at 2.3 A resolution reveals a novel conformation: the beta-slip. A three-residue shift in beta strand D places Leu-58 at the position normally occupied by Leu-55 now mutated to serine. The beta-slip is best defined in two of the four monomers, where it makes new protein-protein interactions to an area normally involved in complex formation with retinol-binding protein. This interaction creates unique packing arrangements, where two protein helices combine to form a double helix in agreement with fiber diffraction and electron microscopy data. Based on these findings, a novel model for transthyretin amyloid formation is presented.
Umea Center for Molecular Pathogenesis Umea University S-901 87, Umea, Sweden.