ジャーナル: Nano Lett / 年: 2025 タイトル: Structural Insights and Functional Dynamics of β-Lactoglobulin Fibrils. 著者: Rebecca Sternke-Hoffmann / David Rhyner / Genki Terashi / Bilal Muhammad Qureshi / Roland Riek / Jason Greenwald / Daisuke Kihara / Viviane Lutz-Bueno / Jinghui Luo / 要旨: Amyloid fibrils from β-lactoglobulin (β-LG), a major whey protein, have attracted interest for nanotechnology due to their biocompatibility, tunable surface chemistry, and ability to bind ...Amyloid fibrils from β-lactoglobulin (β-LG), a major whey protein, have attracted interest for nanotechnology due to their biocompatibility, tunable surface chemistry, and ability to bind functional molecules. They serve as scaffolds for metal nanoparticle synthesis, carriers for bioactive compounds, and building blocks for nanomaterials with tailored mechanical and optical properties. However, their dynamic architecture remains incompletely understood, limiting their rational design. Here, we combine cryo-electron microscopy (cryo-EM), small-angle X-ray scattering (SAXS), and molecular dynamics (MD) simulations to investigate β-LG fibrils formed under mildly denaturing conditions. Cryo-EM reveals a monomeric polymorph with a conserved core (Leu1-Ala34) and a disordered "fuzzy coat". Flexible domains were modeled and evaluated by MD, identifying one stable conformation (Asn90-Thr97). The ionic strength reduced the coat flexibility and promoted iron binding, suggesting environmental responsiveness. These findings link fibril flexibility to functional potential, offering mechanistic insight into engineering β-LG-based nanomaterials.
モデル: Quantifoil R1.2/1.3 / 材質: COPPER / メッシュ: 300 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: CONTINUOUS / 支持フィルム - Film thickness: 1 / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 30 sec. / 前処理 - 雰囲気: AIR / 前処理 - 気圧: 39.0 kPa 詳細: PELCO easiGLOW Glow discharge cleaning system using 25 mA for 30 s.
凍結
凍結剤: ETHANE-PROPANE / チャンバー内湿度: 100 % / チャンバー内温度: 295.15 K / 装置: FEI VITROBOT MARK IV 詳細: 3.7 ul sample was applied and blotted for 6 s after a wait time of 30 s with a force of 0.
詳細
This sample was monodisperse. The sample was prepared at 7 mg/ml and diluted 15 times for EM grid.