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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 8bip | ||||||
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タイトル | Structure of a yeast 80S ribosome-bound N-Acetyltransferase B complex | ||||||
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![]() | RIBOSOME / translation / n-acetylation / nascent chain / co-translational modification / NatB | ||||||
機能・相同性 | ![]() N-terminal methionine Nalpha-acetyltransferase NatB / NatB complex / mitochondrion inheritance / protein N-terminal-methionine acetyltransferase activity / protein-N-terminal amino-acid acetyltransferase activity / acetyltransferase activator activity / pre-mRNA 5'-splice site binding / response to cycloheximide / cleavage in ITS2 between 5.8S rRNA and LSU-rRNA of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / SRP-dependent cotranslational protein targeting to membrane ...N-terminal methionine Nalpha-acetyltransferase NatB / NatB complex / mitochondrion inheritance / protein N-terminal-methionine acetyltransferase activity / protein-N-terminal amino-acid acetyltransferase activity / acetyltransferase activator activity / pre-mRNA 5'-splice site binding / response to cycloheximide / cleavage in ITS2 between 5.8S rRNA and LSU-rRNA of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / SRP-dependent cotranslational protein targeting to membrane / GTP hydrolysis and joining of the 60S ribosomal subunit / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / negative regulation of mRNA splicing, via spliceosome / Formation of a pool of free 40S subunits / preribosome, large subunit precursor / L13a-mediated translational silencing of Ceruloplasmin expression / translational elongation / ribosomal large subunit export from nucleus / regulation of translational fidelity / protein-RNA complex assembly / translational termination / maturation of LSU-rRNA / ERAD pathway / cytoskeleton organization / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / ribosomal large subunit biogenesis / regulation of actin cytoskeleton organization / translational initiation / macroautophagy / maintenance of translational fidelity / modification-dependent protein catabolic process / protein tag activity / rRNA processing / ribosome biogenesis / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / negative regulation of translation / rRNA binding / protein ubiquitination / ribosome / structural constituent of ribosome / translation / response to antibiotic / mRNA binding / ubiquitin protein ligase binding / nucleolus / RNA binding / zinc ion binding / nucleus / cytosol / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.1 Å | ||||||
![]() | Knorr, A.G. / Mackens-Kiani, T. / Musial, J. / Berninghausen, O. / Becker, T. / Beatrix, B. / Beckmann, R. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: The dynamic architecture of Map1- and NatB-ribosome complexes coordinates the sequential modifications of nascent polypeptide chains. 著者: Alexandra G Knorr / Timur Mackens-Kiani / Joanna Musial / Otto Berninghausen / Thomas Becker / Birgitta Beatrix / Roland Beckmann / ![]() 要旨: Cotranslational modification of the nascent polypeptide chain is one of the first events during the birth of a new protein. In eukaryotes, methionine aminopeptidases (MetAPs) cleave off the starter ...Cotranslational modification of the nascent polypeptide chain is one of the first events during the birth of a new protein. In eukaryotes, methionine aminopeptidases (MetAPs) cleave off the starter methionine, whereas N-acetyl-transferases (NATs) catalyze N-terminal acetylation. MetAPs and NATs compete with other cotranslationally acting chaperones, such as ribosome-associated complex (RAC), protein targeting and translocation factors (SRP and Sec61) for binding sites at the ribosomal tunnel exit. Yet, whereas well-resolved structures for ribosome-bound RAC, SRP and Sec61, are available, structural information on the mode of ribosome interaction of eukaryotic MetAPs or of the five cotranslationally active NATs is only available for NatA. Here, we present cryo-EM structures of yeast Map1 and NatB bound to ribosome-nascent chain complexes. Map1 is mainly associated with the dynamic rRNA expansion segment ES27a, thereby kept at an ideal position below the tunnel exit to act on the emerging substrate nascent chain. For NatB, we observe two copies of the NatB complex. NatB-1 binds directly below the tunnel exit, again involving ES27a, and NatB-2 is located below the second universal adapter site (eL31 and uL22). The binding mode of the two NatB complexes on the ribosome differs but overlaps with that of NatA and Map1, implying that NatB binds exclusively to the tunnel exit. We further observe that ES27a adopts distinct conformations when bound to NatA, NatB, or Map1, together suggesting a contribution to the coordination of a sequential activity of these factors on the emerging nascent chain at the ribosomal exit tunnel. | ||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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PDBx/mmCIF形式 | ![]() | 3 MB | 表示 | ![]() |
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PDB形式 | ![]() | 表示 | ![]() | |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
-RNA鎖 , 3種, 3分子 C4C31
#1: RNA鎖 | 分子量: 38951.105 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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#2: RNA鎖 | 分子量: 50682.922 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
#44: RNA鎖 | 分子量: 1097132.625 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
+60S ribosomal protein ... , 41種, 41分子 LALBLCLDLELFLGLHLILJLLLMLNLOLPLQLRLSLTLULVLWLXLYLZLaLbLcLdLe...
-N-terminal acetyltransferase B complex ... , 2種, 2分子 AB
#45: タンパク質 | 分子量: 22953.254 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() 参照: UniProt: Q06504, N-terminal methionine Nalpha-acetyltransferase NatB |
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#46: タンパク質 | 分子量: 92930.539 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
-タンパク質・ペプチド , 1種, 1分子 8
#47: タンパク質・ペプチド | 分子量: 1975.426 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Model of the nascent peptide chain based on the experimental map 由来: (天然) ![]() ![]() |
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-非ポリマー , 2種, 211分子 


#48: 化合物 | ChemComp-MG / #49: 化合物 | ChemComp-ZN / |
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-詳細
研究の焦点であるリガンドがあるか | N |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: Large ribosomal subunit of a yeast 80S ribosome with NatB-complex タイプ: RIBOSOME / Entity ID: #47, #1-#46 / 由来: NATURAL |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.5 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 3500 nm / 最小 デフォーカス(公称値): 500 nm |
撮影 | 電子線照射量: 45.2 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
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解析
ソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.1 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 45530 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
精密化 | 交差検証法: NONE | ||||||||||||||||||||||||
拘束条件 |
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