- EMDB-9383: Encapsulin iron storage compartment from Quasibacillus thermotolerans -
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基本情報
登録情報
データベース: EMDB / ID: EMD-9383
タイトル
Encapsulin iron storage compartment from Quasibacillus thermotolerans
マップデータ
Final EM map filtered to 3.85A with applied sharpening B-factor of -151
試料
複合体: Encapsulin iron storage compartment from Quasibacillus thermotolerans
タンパク質・ペプチド: Encapsulating protein for a DyP-type peroxidase
タンパク質・ペプチド: targeting peptide
キーワード
encapsulin / iron storage / IMEF / icosahedral / METAL TRANSPORT
機能・相同性
Type 1 encapsulin shell protein / Encapsulating protein for peroxidase / : / encapsulin nanocompartment / iron ion transport / intracellular iron ion homeostasis / Type 1 encapsulin shell protein
German Federal Ministry for Education and Research
LPDS 2014-05
ドイツ
引用
ジャーナル: Elife / 年: 2019 タイトル: Large protein organelles form a new iron sequestration system with high storage capacity. 著者: Tobias W Giessen / Benjamin J Orlando / Andrew A Verdegaal / Melissa G Chambers / Jules Gardener / David C Bell / Gabriel Birrane / Maofu Liao / Pamela A Silver / 要旨: Iron storage proteins are essential for cellular iron homeostasis and redox balance. Ferritin proteins are the major storage units for bioavailable forms of iron. Some organisms lack ferritins, and ...Iron storage proteins are essential for cellular iron homeostasis and redox balance. Ferritin proteins are the major storage units for bioavailable forms of iron. Some organisms lack ferritins, and it is not known how they store iron. Encapsulins, a class of protein-based organelles, have recently been implicated in microbial iron and redox metabolism. Here, we report the structural and mechanistic characterization of a 42 nm two-component encapsulin-based iron storage compartment from . Using cryo-electron microscopy and x-ray crystallography, we reveal the assembly principles of a thermostable T = 4 shell topology and its catalytic ferroxidase cargo and show interactions underlying cargo-shell co-assembly. This compartment has an exceptionally large iron storage capacity storing over 23,000 iron atoms. Our results reveal a new approach for survival in diverse habitats with limited or fluctuating iron availability via an iron storage system able to store 10 to 20 times more iron than ferritin.