ジャーナル: Cell / 年: 2018 タイトル: Structural Insights into Mdn1, an Essential AAA Protein Required for Ribosome Biogenesis. 著者: Zhen Chen / Hiroshi Suzuki / Yuki Kobayashi / Ashley C Wang / Frank DiMaio / Shigehiro A Kawashima / Thomas Walz / Tarun M Kapoor / 要旨: Mdn1 is an essential AAA (ATPase associated with various activities) protein that removes assembly factors from distinct precursors of the ribosomal 60S subunit. However, Mdn1's large size (∼5,000 ...Mdn1 is an essential AAA (ATPase associated with various activities) protein that removes assembly factors from distinct precursors of the ribosomal 60S subunit. However, Mdn1's large size (∼5,000 amino acid [aa]) and its limited homology to other well-studied proteins have restricted our understanding of its remodeling function. Here, we present structures for S. pombe Mdn1 in the presence of AMPPNP at up to ∼4 Å or ATP plus Rbin-1, a chemical inhibitor, at ∼8 Å resolution. These data reveal that Mdn1's MIDAS domain is tethered to its ring-shaped AAA domain through an ∼20 nm long structured linker and a flexible ∼500 aa Asp/Glu-rich motif. We find that the MIDAS domain, which also binds other ribosome-assembly factors, docks onto the AAA ring in a nucleotide state-specific manner. Together, our findings reveal how conformational changes in the AAA ring can be directly transmitted to the MIDAS domain and thereby drive the targeted release of assembly factors from ribosomal 60S-subunit precursors.
全体 : C-terminal density map of the C-terminally truncated Mdn1 in the ...
全体
名称: C-terminal density map of the C-terminally truncated Mdn1 in the presence of AMPPNP
要素
細胞器官・細胞要素: C-terminal density map of the C-terminally truncated Mdn1 in the presence of AMPPNP
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超分子 #1: C-terminal density map of the C-terminally truncated Mdn1 in the ...
超分子
名称: C-terminal density map of the C-terminally truncated Mdn1 in the presence of AMPPNP タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2