National Institutes of Health/National Institute on Aging (NIH/NIA)
NIH NIA AG029430
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2018 タイトル: Atomic structures of TDP-43 LCD segments and insights into reversible or pathogenic aggregation. 著者: Elizabeth L Guenther / Qin Cao / Hamilton Trinh / Jiahui Lu / Michael R Sawaya / Duilio Cascio / David R Boyer / Jose A Rodriguez / Michael P Hughes / David S Eisenberg / 要旨: The normally soluble TAR DNA-binding protein 43 (TDP-43) is found aggregated both in reversible stress granules and in irreversible pathogenic amyloid. In TDP-43, the low-complexity domain (LCD) is ...The normally soluble TAR DNA-binding protein 43 (TDP-43) is found aggregated both in reversible stress granules and in irreversible pathogenic amyloid. In TDP-43, the low-complexity domain (LCD) is believed to be involved in both types of aggregation. To uncover the structural origins of these two modes of β-sheet-rich aggregation, we have determined ten structures of segments of the LCD of human TDP-43. Six of these segments form steric zippers characteristic of the spines of pathogenic amyloid fibrils; four others form LARKS, the labile amyloid-like interactions characteristic of protein hydrogels and proteins found in membraneless organelles, including stress granules. Supporting a hypothetical pathway from reversible to irreversible amyloid aggregation, we found that familial ALS variants of TDP-43 convert LARKS to irreversible aggregates. Our structures suggest how TDP-43 adopts both reversible and irreversible β-sheet aggregates and the role of mutation in the possible transition of reversible to irreversible pathogenic aggregation.
構造決定の手法: AB INITIO PHASING / 解像度: 1→15.22 Å / Cor.coef. Fo:Fc: 0.986 / Cor.coef. Fo:Fc free: 0.983 / SU B: 0.436 / SU ML: 0.01 / 交差検証法: THROUGHOUT / σ(F): 0 / ESU R: 0.02 / ESU R Free: 0.018 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS U VALUES : REFINED INDIVIDUALLY