- EMDB-21913: Mitochondrial SAM complex in lipid nanodiscs -
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基本情報
登録情報
データベース: EMDB / ID: EMD-21913
タイトル
Mitochondrial SAM complex in lipid nanodiscs
マップデータ
試料
複合体: Mitochondrial SAM complex in lipid nanodiscs
タンパク質・ペプチド: Sam35
タンパク質・ペプチド: Bac_surface_Ag domain-containing protein
タンパク質・ペプチド: Tom37 domain-containing protein
キーワード
Mitochondrial SAM complex / Sam35 / Sam37 / Sam50. / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
SAM complex / protein insertion into mitochondrial outer membrane / mitochondrion organization / protein transport / mitochondrial outer membrane 類似検索 - 分子機能
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)
米国
引用
ジャーナル: Nat Commun / 年: 2020 タイトル: Structural insight into mitochondrial β-barrel outer membrane protein biogenesis. 著者: Kathryn A Diederichs / Xiaodan Ni / Sarah E Rollauer / Istvan Botos / Xiaofeng Tan / Martin S King / Edmund R S Kunji / Jiansen Jiang / Susan K Buchanan / 要旨: In mitochondria, β-barrel outer membrane proteins mediate protein import, metabolite transport, lipid transport, and biogenesis. The Sorting and Assembly Machinery (SAM) complex consists of three ...In mitochondria, β-barrel outer membrane proteins mediate protein import, metabolite transport, lipid transport, and biogenesis. The Sorting and Assembly Machinery (SAM) complex consists of three proteins that assemble as a 1:1:1 complex to fold β-barrel proteins and insert them into the mitochondrial outer membrane. We report cryoEM structures of the SAM complex from Myceliophthora thermophila, which show that Sam50 forms a 16-stranded transmembrane β-barrel with a single polypeptide-transport-associated (POTRA) domain extending into the intermembrane space. Sam35 and Sam37 are located on the cytosolic side of the outer membrane, with Sam35 capping Sam50, and Sam37 interacting extensively with Sam35. Sam35 and Sam37 each adopt a GST-like fold, with no functional, structural, or sequence similarity to their bacterial counterparts. Structural analysis shows how the Sam50 β-barrel opens a lateral gate to accommodate its substrates.