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基本情報
登録情報 | データベース: PDB / ID: 8f1e | |||||||||||||||||||||||||||||||||
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タイトル | Cryo-EM structure of Kap114 bound to Gsp1 (RanGTP) and H2A-H2B | |||||||||||||||||||||||||||||||||
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![]() | PROTEIN TRANSPORT/STRUCTURAL PROTEIN/NUCLEAR PROTEIN / Karyopherin Beta / Nuclear Transport / GTPase / Histone Chaperone / Histones / PROTEIN TRANSPORT-STRUCTURAL PROTEIN-NUCLEAR PROTEIN complex | |||||||||||||||||||||||||||||||||
機能・相同性 | ![]() regulation of cell cycle phase transition / HATs acetylate histones / exonucleolytic trimming to generate mature 3'-end of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Condensation of Prophase Chromosomes / SIRT1 negatively regulates rRNA expression / regulation of nucleocytoplasmic transport / Postmitotic nuclear pore complex (NPC) reformation / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / Assembly of the ORC complex at the origin of replication / HDACs deacetylate histones ...regulation of cell cycle phase transition / HATs acetylate histones / exonucleolytic trimming to generate mature 3'-end of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Condensation of Prophase Chromosomes / SIRT1 negatively regulates rRNA expression / regulation of nucleocytoplasmic transport / Postmitotic nuclear pore complex (NPC) reformation / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / Assembly of the ORC complex at the origin of replication / HDACs deacetylate histones / NLS-bearing protein import into nucleus / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / Oxidative Stress Induced Senescence / replication fork protection complex / RMTs methylate histone arginines / nuclear import signal receptor activity / poly(A)+ mRNA export from nucleus / nucleus organization / RNA Polymerase I Promoter Escape / Estrogen-dependent gene expression / mRNA transport / Ub-specific processing proteases / nuclear pore / ribosomal subunit export from nucleus / small GTPase binding / protein import into nucleus / structural constituent of chromatin / nucleosome / nuclear envelope / heterochromatin formation / chromatin organization / protein heterodimerization activity / DNA repair / GTPase activity / regulation of DNA-templated transcription / GTP binding / DNA 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: 3.28 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. | |||||||||||||||||||||||||||||||||
履歴 |
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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 | ![]() | 269.6 KB | 表示 | ![]() |
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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
-タンパク質 , 4種, 4分子 ABCD
#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: 13881.980 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: HTA2, H2A2, YBL003C, YBL0103 / 発現宿主: ![]() ![]() |
#3: タンパク質 | 分子量: 14133.145 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: HTB2, H2B2, YBL002W, YBL0104 / 発現宿主: ![]() ![]() |
#4: タンパク質 | 分子量: 20417.590 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: GSP1, CNR1, CST17, YLR293C, L8003.19 発現宿主: ![]() ![]() 参照: UniProt: P32835 |
-非ポリマー , 2種, 2分子 


#5: 化合物 | ChemComp-MG / |
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#6: 化合物 | ChemComp-GTP / |
-詳細
研究の焦点であるリガンドがあるか | Y |
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Has protein modification | N |
-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) and H2A-H2B タイプ: COMPLEX / Entity ID: #1-#4 / 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 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
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: 1.20.1_4487: / 分類: 精密化 | ||||||||||||||||||||||||
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EMソフトウェア | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.28 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 134915 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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