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基本情報
登録情報 | データベース: PDB / ID: 8f19 | ||||||
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タイトル | Cryo-EM structure of Kap114 bound to Gsp1 (RanGTP) | ||||||
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![]() | PROTEIN TRANSPORT/NUCLEAR PROTEIN / Karyopherin Beta / Nuclear Transport / GTPase / PROTEIN TRANSPORT-NUCLEAR PROTEIN complex | ||||||
機能・相同性 | ![]() regulation of cell cycle phase transition / Postmitotic nuclear pore complex (NPC) reformation / regulation of nucleocytoplasmic transport / exonucleolytic trimming to generate mature 3'-end of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / nuclear import signal receptor activity / poly(A)+ mRNA export from nucleus / NLS-bearing protein import into nucleus / nucleus organization / mRNA transport / ribosomal subunit export from nucleus ...regulation of cell cycle phase transition / Postmitotic nuclear pore complex (NPC) reformation / regulation of nucleocytoplasmic transport / exonucleolytic trimming to generate mature 3'-end of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / nuclear import signal receptor activity / poly(A)+ mRNA export from nucleus / NLS-bearing protein import into nucleus / nucleus organization / mRNA transport / ribosomal subunit export from nucleus / nuclear pore / small GTPase binding / protein import into nucleus / nuclear envelope / GTPase activity / GTP binding / nucleus / cytoplasm / cytosol 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: 3.49 Å | ||||||
![]() | Jiou, J. / Chook, Y.M. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Mechanism of RanGTP priming H2A-H2B release from Kap114 in an atypical RanGTP•Kap114•H2A-H2B complex. 著者: Jenny Jiou / Joy M Shaffer / Natalia E Bernades / Ho Yee Joyce Fung / Juliana Kikumoto Dias / Sheena D'Arcy / Yuh Min Chook / ![]() 要旨: Previously, we showed that the nuclear import receptor Importin-9 wraps around the H2A-H2B core to chaperone and transport it from the cytoplasm to the nucleus. However, unlike most nuclear import ...Previously, we showed that the nuclear import receptor Importin-9 wraps around the H2A-H2B core to chaperone and transport it from the cytoplasm to the nucleus. However, unlike most nuclear import systems where RanGTP dissociates cargoes from their importins, RanGTP binds stably to the Importin-9•H2A-H2B complex, and formation of the ternary RanGTP•Importin-9•H2A-H2B complex facilitates H2A-H2B release to the assembling nucleosome. It was unclear how RanGTP and the cargo H2A-H2B can bind simultaneously to an importin, and how interactions of the three components position H2A-H2B for release. Here, we show cryo-EM structures of Importin-9•RanGTP and of its yeast homolog Kap114, including Kap114•RanGTP, Kap114•H2A-H2B, and RanGTP•Kap114•H2A-H2B, to explain how the conserved Kap114 binds H2A-H2B and RanGTP simultaneously and how the GTPase primes histone transfer to the nucleosome. In the ternary complex, RanGTP binds to the N-terminal repeats of Kap114 in the same manner as in the Kap114/Importin-9•RanGTP complex, and H2A-H2B binds via its acidic patch to the Kap114 C-terminal repeats much like in the Kap114/Importin-9•H2A-H2B complex. Ran binds to a different conformation of Kap114 in the ternary RanGTP•Kap114•H2A-H2B complex. Here, Kap114 no longer contacts the H2A-H2B surface proximal to the H2A docking domain that drives nucleosome assembly, positioning it for transfer to the assembling nucleosome or to dedicated H2A-H2B chaperones in the nucleus. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 219.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 169.4 KB | 表示 | ![]() |
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その他 | ![]() |
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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
#1: タンパク質 | 分子量: 114019.695 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 株: ATCC 204508 / S288c / 遺伝子: KAP114, YGL241W, HRC1004 発現宿主: ![]() ![]() 参照: UniProt: P53067 |
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#2: タンパク質 | 分子量: 20417.590 Da / 分子数: 1 / Mutation: Q71L / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 株: ATCC 204508 / S288c / 遺伝子: GSP1, CNR1, CST17, YLR293C, L8003.19 発現宿主: ![]() ![]() 参照: UniProt: P32835 |
#3: 化合物 | ChemComp-GTP / |
#4: 化合物 | ChemComp-MG / |
研究の焦点であるリガンドがあるか | Y |
-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: Complex of Kap114 bound to Gsp1 (RanGTP) / タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT | ||||||||||||||||||||||||||||||
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由来(天然) | 生物種: ![]() ![]() | ||||||||||||||||||||||||||||||
由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||||||||||||||||||||
緩衝液 | pH: 7.5 詳細: 20 mM Tris pH 7.5, 300 mM NaCl, 2 mM MgCl2, 1 mM TCEP, and 0.1% NP-40 | ||||||||||||||||||||||||||||||
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試料 | 濃度: 4 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES / 詳細: 1 Kap114 to 1.2 Gsp1 (RanGTP) ratio | ||||||||||||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 4 K |
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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): 2500 nm / 最小 デフォーカス(公称値): 1500 nm |
撮影 | 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.19.1_4122: / 分類: 精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.49 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 277305 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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