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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: 8fuz | |||||||||
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タイトル | Human IMPDH2 mutant - L245P, treated with GTP, ATP, IMP, and NAD+; filament assembly interface reconstruction | |||||||||
![]() | Inosine-5'-monophosphate dehydrogenase 2 | |||||||||
![]() | OXIDOREDUCTASE / Filament / Dehydrogenase / CBS domain / Bateman domain / purine biosynthesis | |||||||||
機能・相同性 | ![]() 'de novo' XMP biosynthetic process / lymphocyte proliferation / Purine ribonucleoside monophosphate biosynthesis / IMP dehydrogenase activity / IMP dehydrogenase / GMP biosynthetic process / Azathioprine ADME / peroxisomal membrane / GTP biosynthetic process / cellular response to interleukin-4 ...'de novo' XMP biosynthetic process / lymphocyte proliferation / Purine ribonucleoside monophosphate biosynthesis / IMP dehydrogenase activity / IMP dehydrogenase / GMP biosynthetic process / Azathioprine ADME / peroxisomal membrane / GTP biosynthetic process / cellular response to interleukin-4 / circadian rhythm / secretory granule lumen / ficolin-1-rich granule lumen / Potential therapeutics for SARS / nucleotide binding / Neutrophil degranulation / DNA binding / RNA binding / extracellular exosome / extracellular region / membrane / nucleus / metal ion binding / 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: 2.1 Å | |||||||||
![]() | O'Neill, A.G. / Kollman, J.M. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Neurodevelopmental disorder mutations in the purine biosynthetic enzyme IMPDH2 disrupt its allosteric regulation. 著者: Audrey G O'Neill / Anika L Burrell / Michael Zech / Orly Elpeleg / Tamar Harel / Simon Edvardson / Hagar Mor-Shaked / Alyssa L Rippert / Tomoki Nomakuchi / Kosuke Izumi / Justin M Kollman / ![]() ![]() ![]() 要旨: Inosine 5' monophosphate dehydrogenase (IMPDH) is a critical regulatory enzyme in purine nucleotide biosynthesis that is inhibited by the downstream product GTP. Multiple point mutations in the human ...Inosine 5' monophosphate dehydrogenase (IMPDH) is a critical regulatory enzyme in purine nucleotide biosynthesis that is inhibited by the downstream product GTP. Multiple point mutations in the human isoform IMPDH2 have recently been associated with dystonia and other neurodevelopmental disorders, but the effect of the mutations on enzyme function has not been described. Here, we report the identification of two additional missense variants in IMPDH2 from affected individuals and show that all of the disease-associated mutations disrupt GTP regulation. Cryo-EM structures of one IMPDH2 mutant suggest this regulatory defect arises from a shift in the conformational equilibrium toward a more active state. This structural and functional analysis provides insight into IMPDH2-associated disease mechanisms that point to potential therapeutic approaches and raises new questions about fundamental aspects of IMPDH regulation. #1: ジャーナル: bioRxiv / 年: 2023 タイトル: Point mutations in IMPDH2 which cause early-onset neurodevelopmental disorders disrupt enzyme regulation and filament structure. 著者: Audrey G O'Neill / Anika L Burrell / Michael Zech / Orly Elpeleg / Tamar Harel / Simon Edvardson / Hagar Mor Shaked / Alyssa L Rippert / Tomoki Nomakuchi / Kosuke Izumi / Justin M Kollman / ![]() ![]() ![]() 要旨: Inosine 5' monophosphate dehydrogenase (IMPDH) is a critical regulatory enzyme in purine nucleotide biosynthesis that is inhibited by the downstream product GTP. Multiple point mutations in the human ...Inosine 5' monophosphate dehydrogenase (IMPDH) is a critical regulatory enzyme in purine nucleotide biosynthesis that is inhibited by the downstream product GTP. Multiple point mutations in the human isoform IMPDH2 have recently been associated with dystonia and other neurodevelopmental disorders, but the effect of the mutations on enzyme function has not been described. Here, we report identification of two additional affected individuals with missense variants in and show that all of the disease-associated mutations disrupt GTP regulation. Cryo-EM structures of one IMPDH2 mutant suggest this regulatory defect arises from a shift in the conformational equilibrium toward a more active state. This structural and functional analysis provides insight into IMPDH2-associated disease mechanisms that point to potential therapeutic approaches and raises new questions about fundamental aspects of IMPDH regulation. #2: ![]() タイトル: New tools for automated high-resolution cryo-EM structure determination in RELION-3. 著者: Jasenko Zivanov / Takanori Nakane / Björn O Forsberg / Dari Kimanius / Wim Jh Hagen / Erik Lindahl / Sjors Hw Scheres / ![]() ![]() ![]() 要旨: Here, we describe the third major release of RELION. CPU-based vector acceleration has been added in addition to GPU support, which provides flexibility in use of resources and avoids memory ...Here, we describe the third major release of RELION. CPU-based vector acceleration has been added in addition to GPU support, which provides flexibility in use of resources and avoids memory limitations. Reference-free autopicking with Laplacian-of-Gaussian filtering and execution of jobs from python allows non-interactive processing during acquisition, including 2D-classification, model generation and 3D-classification. Per-particle refinement of CTF parameters and correction of estimated beam tilt provides higher resolution reconstructions when particles are at different heights in the ice, and/or coma-free alignment has not been optimal. Ewald sphere curvature correction improves resolution for large particles. We illustrate these developments with publicly available data sets: together with a Bayesian approach to beam-induced motion correction it leads to resolution improvements of 0.2-0.7 Å compared to previous RELION versions. | |||||||||
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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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ダウンロード
PDBx/mmCIF形式 | ![]() | 583.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 483 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 2 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 2.1 MB | 表示 | |
XML形式データ | ![]() | 92.6 KB | 表示 | |
CIF形式データ | ![]() | 132.7 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-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: 56464.453 Da / 分子数: 8 / 変異: L245P / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #2: 化合物 | ChemComp-IMP / #3: 化合物 | ChemComp-NAD / 研究の焦点であるリガンドがあるか | Y | |
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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: FILAMENT / 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: Filament of Inosine-5'-monophosphate dehydrogenase 2 - L245P mutant, bound to GTP, ATP, IMP, and NAD+ タイプ: COMPLEX 詳細: 5 uM enzyme was mixed with 20 mM GTP, 1 mM ATP, 1 mM MgCl2, 3 mM IMP, and 5 mM NAD+. Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
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 |
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 / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 280 nm / 最小 デフォーカス(公称値): 1740 nm / Cs: 2.7 mm |
試料ホルダ | 凍結剤: NITROGEN |
撮影 | 平均露光時間: 3 sec. / 電子線照射量: 60 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 実像数: 2967 |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 1421990 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: D4 (2回x4回 2面回転対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.1 Å / 解像度の算出法: OTHER / 粒子像の数: 89981 / 詳細: FSCref 0.5 cut-off from PHENIX density modification / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL | ||||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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