- EMDB-35984: Single-particle cryo-EM structure of mouse apoferritin at 1.19 An... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-35984
タイトル
Single-particle cryo-EM structure of mouse apoferritin at 1.19 Angstrom resolution (Dataset A)
マップデータ
試料
複合体: Apoferritin from Mus musculus
タンパク質・ペプチド: Ferritin heavy chain
リガンド: SODIUM ION
リガンド: water
キーワード
single-particle cryo-EM / Cold field emission / CFEG / Apoferritin / CRYO ARM / STRUCTURAL PROTEIN
機能・相同性
機能・相同性情報
Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / negative regulation of ferroptosis / ferroxidase / autolysosome / ferroxidase activity / intracellular sequestering of iron ion / negative regulation of fibroblast proliferation / endocytic vesicle lumen ...Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / negative regulation of ferroptosis / ferroxidase / autolysosome / ferroxidase activity / intracellular sequestering of iron ion / negative regulation of fibroblast proliferation / endocytic vesicle lumen / autophagosome / Neutrophil degranulation / ferric iron binding / ferrous iron binding / iron ion transport / immune response / iron ion binding / negative regulation of cell population proliferation / mitochondrion / extracellular region / identical protein binding / membrane / cytosol / cytoplasm 類似検索 - 分子機能
ジャーナル: Commun Chem / 年: 2023 タイトル: Measurement of charges and chemical bonding in a cryo-EM structure. 著者: Saori Maki-Yonekura / Keisuke Kawakami / Kiyofumi Takaba / Tasuku Hamaguchi / Koji Yonekura / 要旨: Hydrogen bonding, bond polarity, and charges in protein molecules play critical roles in the stabilization of protein structures, as well as affecting their functions such as enzymatic catalysis, ...Hydrogen bonding, bond polarity, and charges in protein molecules play critical roles in the stabilization of protein structures, as well as affecting their functions such as enzymatic catalysis, electron transfer, and ligand binding. These effects can potentially be measured in Coulomb potentials using cryogenic electron microscopy (cryo-EM). We here present charges and bond properties of hydrogen in a sub-1.2 Å resolution structure of a protein complex, apoferritin, by single-particle cryo-EM. A weighted difference map reveals positive densities for most hydrogen atoms in the core region of the complex, while negative densities around acidic amino-acid side chains are likely related to negative charges. The former positive densities identify the amino- and oxo-termini of asparagine and glutamine side chains. The latter observations were verified by spatial-resolution selection and a dose-dependent frame series. The average position of the hydrogen densities depends on the parent bonded-atom type, and this is validated by the estimated level of the standard uncertainties in the bond lengths.