phosphatidylinositol 3-kinase complex, class III, type I / phagophore assembly site membrane / phagophore assembly site / vacuolar membrane / macroautophagy / structural molecule activity / identical protein binding / cytoplasm 類似検索 - 分子機能
IODIDE ION / AMMONIUM ION / NITRATE ION / Autophagy-related protein 38 類似検索 - 構成要素
ジャーナル: Autophagy / 年: 2016 タイトル: Characterization of Atg38 and NRBF2, a fifth subunit of the autophagic Vps34/PIK3C3 complex. 著者: Yohei Ohashi / Nicolas Soler / Miguel García Ortegón / Lufei Zhang / Marie L Kirsten / Olga Perisic / Glenn R Masson / John E Burke / Arjen J Jakobi / Apostolos A Apostolakis / Christopher ...著者: Yohei Ohashi / Nicolas Soler / Miguel García Ortegón / Lufei Zhang / Marie L Kirsten / Olga Perisic / Glenn R Masson / John E Burke / Arjen J Jakobi / Apostolos A Apostolakis / Christopher M Johnson / Maki Ohashi / Nicholas T Ktistakis / Carsten Sachse / Roger L Williams / 要旨: The phosphatidylinositol 3-kinase Vps34 is part of several protein complexes. The structural organization of heterotetrameric complexes is starting to emerge, but little is known about organization ...The phosphatidylinositol 3-kinase Vps34 is part of several protein complexes. The structural organization of heterotetrameric complexes is starting to emerge, but little is known about organization of additional accessory subunits that interact with these assemblies. Combining hydrogen-deuterium exchange mass spectrometry (HDX-MS), X-ray crystallography and electron microscopy (EM), we have characterized Atg38 and its human ortholog NRBF2, accessory components of complex I consisting of Vps15-Vps34-Vps30/Atg6-Atg14 (yeast) and PIK3R4/VPS15-PIK3C3/VPS34-BECN1/Beclin 1-ATG14 (human). HDX-MS shows that Atg38 binds the Vps30-Atg14 subcomplex of complex I, using mainly its N-terminal MIT domain and bridges the coiled-coil I regions of Atg14 and Vps30 in the base of complex I. The Atg38 C-terminal domain is important for localization to the phagophore assembly site (PAS) and homodimerization. Our 2.2 Å resolution crystal structure of the Atg38 C-terminal homodimerization domain shows 2 segments of α-helices assembling into a mushroom-like asymmetric homodimer with a 4-helix cap and a parallel coiled-coil stalk. One Atg38 homodimer engages a single complex I. This is in sharp contrast to human NRBF2, which also forms a homodimer, but this homodimer can bridge 2 complex I assemblies.
C: Autophagy-related protein 38 D: Autophagy-related protein 38 A: Autophagy-related protein 38 B: Autophagy-related protein 38 G: Autophagy-related protein 38 H: Autophagy-related protein 38 K: Autophagy-related protein 38 L: Autophagy-related protein 38 E: Autophagy-related protein 38 F: Autophagy-related protein 38 I: Autophagy-related protein 38 J: Autophagy-related protein 38 ヘテロ分子
温度: 290 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 5 詳細: 1.97 M ammonium nitrate, 0.15 M (D/L) malate pH 5.0 and 0.136 M Mg sulfate The full-length Atg38 protein was subjected to limited proteolysis. Atg38 (300 microliters at 16 mg/mL in gel- ...詳細: 1.97 M ammonium nitrate, 0.15 M (D/L) malate pH 5.0 and 0.136 M Mg sulfate The full-length Atg38 protein was subjected to limited proteolysis. Atg38 (300 microliters at 16 mg/mL in gel-filtration buffer containing 20 mM Tris-HCl pH 8.8, 150 mM NaCl, 1 mM TCEP) was mixed with subtilisin (3 microliters at 1 mg/mL, using subtilisn from the ProteAce kit, Hampton Research), incubated for 10 h at 4 degrees C and set up for crystallization without further purification Temp details: 290.15