National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM137929
米国
引用
ジャーナル: Science / 年: 2022 タイトル: Structures of 's respiratory chain reveal the diversity of eukaryotic core metabolism. 著者: Long Zhou / María Maldonado / Abhilash Padavannil / Fei Guo / James A Letts / 要旨: Respiration is a core biological energy-converting process whose last steps are carried out by a chain of multisubunit complexes in the inner mitochondrial membrane. To probe the functional and ...Respiration is a core biological energy-converting process whose last steps are carried out by a chain of multisubunit complexes in the inner mitochondrial membrane. To probe the functional and structural diversity of eukaryotic respiration, we examined the respiratory chain of the ciliate (Tt). Using cryo-electron microscopy on a mixed sample, we solved structures of a supercomplex between Tt complex I (Tt-CI) and Tt-CIII (Tt-SC I+III) and a structure of Tt-CIV. Tt-SC I+III (~2.3 megadaltons) is a curved assembly with structural and functional symmetry breaking. Tt-CIV is a ~2.7-megadalton dimer with more than 50 subunits per protomer, including mitochondrial carriers and a TIM8-TIM13-like domain. Our structural and functional study of the respiratory chain reveals divergence in key components of eukaryotic respiration, thereby expanding our understanding of core metabolism.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277.15 K / 装置: FEI VITROBOT MARK III 詳細: incubation time before blotting: 60s blot time: 9s blot force: 25 offset: -2 incubation after blotting: 0s.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 1 / 実像数: 7895 / 平均露光時間: 5.9 sec. / 平均電子線量: 66.69 e/Å2