ジャーナル: J Mol Biol / 年: 2025 タイトル: Impacts of D-aspartate on the Aggregation Kinetics and Structural Polymorphism of Amyloid β Peptide 1-42. 著者: Li-Ching Hsiao / Chih-Hsuan Lee / Karine Mazmanian / Masaya Yoshida / Genta Ito / Takuya Murata / Naoko Utsunomiya-Tate / Takeharu Haino / Shih-Ichi Tate / Shang-Te Danny Hsu / 要旨: Isomerization of L-Aspartate (L-Asp) into D-aspartate (D-Asp) occurs naturally in proteins at a rate that is much faster than that of other amino acid types. Accumulation of D-Asp is age-dependent, ...Isomerization of L-Aspartate (L-Asp) into D-aspartate (D-Asp) occurs naturally in proteins at a rate that is much faster than that of other amino acid types. Accumulation of D-Asp is age-dependent, which could alter protein structures and, therefore, functions. Site-specific introduction of D-Asp can accelerate aggregation kinetics of a variety of proteins associated with misfolding diseases. Here, we showed by thioflavin T fluorescence that the isomerization of L-Asp at different positions of amyloid β peptide 1-42 (Aβ42) generates opposing effects on its aggregation kinetics. We further determined the atomic structures of Aβ42 amyloid fibrils harboring a single D-Asp at position 23 and two D-Asp at positions 7 and 23 by cryo-electron microscopy helical reconstruction - cross-validated by cryo-electron tomography and atomic force microscopy - to reveal how D-Asp contributes to the formation of a unique triple stranded amyloid fibril structure stabilized by two threads of well-ordered water molecules. These findings provide crucial insights into how the conversion from L- to D-Asp influences the aggregation propensity and amyloid polymorphism of Aβ42.
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FO: Amyloid-beta precursor protein FP: Amyloid-beta precursor protein FN: Amyloid-beta precursor protein FM: Amyloid-beta precursor protein FL: Amyloid-beta precursor protein FQ: Amyloid-beta precursor protein FK: Amyloid-beta precursor protein FJ: Amyloid-beta precursor protein FI: Amyloid-beta precursor protein FH: Amyloid-beta precursor protein FG: Amyloid-beta precursor protein FF: Amyloid-beta precursor protein