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基本情報
登録情報 | データベース: PDB / ID: 6n88 | |||||||||
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タイトル | Cryo-EM structure of the Importin7:Importin beta:Histone H1.0 complex | |||||||||
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![]() | TRANSPORT PROTEIN / Imp7:ImpB:H1.0 / Importin / Histone H1 / nuclear import / disordered interactions | |||||||||
機能・相同性 | ![]() RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / endoplasmic reticulum tubular network / importin-alpha family protein binding / positive regulation of transcription regulatory region DNA binding / establishment of mitotic spindle localization / astral microtubule organization / negative regulation of DNA recombination / Transport of Ribonucleoproteins into the Host Nucleus ...RNA import into nucleus / Inhibition of nitric oxide production / mitotic chromosome movement towards spindle pole / endoplasmic reticulum tubular network / importin-alpha family protein binding / positive regulation of transcription regulatory region DNA binding / establishment of mitotic spindle localization / astral microtubule organization / negative regulation of DNA recombination / Transport of Ribonucleoproteins into the Host Nucleus / Regulation of cholesterol biosynthesis by SREBP (SREBF) / NS1 Mediated Effects on Host Pathways / NLS-dependent protein nuclear import complex / Initiation of Nuclear Envelope (NE) Reformation / Apoptosis induced DNA fragmentation / ribosomal protein import into nucleus / nuclear localization sequence binding / Nuclear import of Rev protein / NLS-bearing protein import into nucleus / Postmitotic nuclear pore complex (NPC) reformation / chromosome condensation / nuclear import signal receptor activity / nucleosomal DNA binding / Formation of Senescence-Associated Heterochromatin Foci (SAHF) / mitotic metaphase chromosome alignment / minor groove of adenine-thymine-rich DNA binding / mitotic spindle assembly / nuclear pore / nucleosome binding / transcription repressor complex / Assembly of the ORC complex at the origin of replication / Hsp90 protein binding / positive regulation of cholesterol biosynthetic process / euchromatin / small GTPase binding / chromatin DNA binding / ISG15 antiviral mechanism / specific granule lumen / protein import into nucleus / heterochromatin formation / nucleosome assembly / cytoplasmic stress granule / structural constituent of chromatin / SARS-CoV-1 activates/modulates innate immune responses / Interferon alpha/beta signaling / actin cytoskeleton / nucleosome / nuclear envelope / double-stranded DNA binding / nuclear membrane / ficolin-1-rich granule lumen / nuclear body / protein domain specific binding / Neutrophil degranulation / chromatin / enzyme binding / Golgi apparatus / RNA binding / zinc ion binding / extracellular exosome / extracellular region / nucleoplasm / nucleus / membrane / 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: 6.2 Å | |||||||||
![]() | Bilokapic, S. / Ivic, N. / Halic, M. | |||||||||
資金援助 | European Union, ![]()
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![]() | ![]() タイトル: Fuzzy Interactions Form and Shape the Histone Transport Complex. 著者: Nives Ivic / Mia Potocnjak / Victor Solis-Mezarino / Franz Herzog / Silvija Bilokapic / Mario Halic / ![]() ![]() ![]() 要旨: Protein transport into the nucleus is mediated by transport receptors. Import of highly charged proteins, such as histone H1 and ribosomal proteins, requires a dimer of two transport receptors. In ...Protein transport into the nucleus is mediated by transport receptors. Import of highly charged proteins, such as histone H1 and ribosomal proteins, requires a dimer of two transport receptors. In this study, we determined the cryo-EM structure of the Imp7:Impβ:H1.0 complex, showing that the two importins form a cradle that accommodates the linker histone. The H1.0 globular domain is bound to Impβ, whereas the acidic loops of Impβ and Imp7 chaperone the positively charged C-terminal tail. Although it remains disordered, the H1 tail serves as a zipper that closes and stabilizes the structure through transient non-specific interactions with importins. Moreover, we found that the GGxxF and FxFG motifs in the Imp7 C-terminal tail are essential for Imp7:Impβ dimerization and H1 import, resembling importin interaction with nucleoporins, which, in turn, promote complex disassembly. The architecture of many other complexes might be similarly defined by rapidly exchanging electrostatic interactions mediated by disordered regions. | |||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 225.1 KB | 表示 | ![]() |
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PDB形式 | ![]() | 137.7 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
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-検証レポート
文書・要旨 | ![]() | 789 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 804.4 KB | 表示 | |
XML形式データ | ![]() | 36.6 KB | 表示 | |
CIF形式データ | ![]() | 61.4 KB | 表示 | |
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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: 119553.156 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: ipo7, MGC52556 / 発現宿主: ![]() ![]() |
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#2: タンパク質 | 分子量: 97257.812 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
#3: タンパク質 | 分子量: 20927.182 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
-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: Imp7:ImpB:H1.0 / タイプ: COMPLEX / Entity ID: all / 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 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: unspecified |
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 |
撮影 | 電子線照射量: 80 e/Å2 フィルム・検出器のモデル: GATAN K2 BASE (4k x 4k) |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.11.1_2575: / 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: 6.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 18900 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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