+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7mh1 | ||||||
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タイトル | Human CTPS2 bound to CTP | ||||||
要素 | CTP synthase 2 | ||||||
キーワード | LIGASE / glutaminase / amidoligase / nucleotide metabolism | ||||||
機能・相同性 | 機能・相同性情報 cytoophidium / CTP synthase (glutamine hydrolysing) / CTP synthase activity / pyrimidine nucleotide metabolic process / 'de novo' CTP biosynthetic process / pyrimidine nucleobase biosynthetic process / Interconversion of nucleotide di- and triphosphates / CTP biosynthetic process / glutamine metabolic process / ATP binding ...cytoophidium / CTP synthase (glutamine hydrolysing) / CTP synthase activity / pyrimidine nucleotide metabolic process / 'de novo' CTP biosynthetic process / pyrimidine nucleobase biosynthetic process / Interconversion of nucleotide di- and triphosphates / CTP biosynthetic process / glutamine metabolic process / ATP binding / identical protein binding / cytosol / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | Homo sapiens (ヒト) | ||||||
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: 2.8 Å | ||||||
データ登録者 | Lynch, E.M. / Kollman, J.M. | ||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: Proc Natl Acad Sci U S A / 年: 2021 タイトル: Structural basis for isoform-specific inhibition of human CTPS1. 著者: Eric M Lynch / Michael A DiMattia / Steven Albanese / Gydo C P van Zundert / Jesse M Hansen / Joel D Quispe / Madison A Kennedy / Andreas Verras / Kenneth Borrelli / Angela V Toms / Neelu ...著者: Eric M Lynch / Michael A DiMattia / Steven Albanese / Gydo C P van Zundert / Jesse M Hansen / Joel D Quispe / Madison A Kennedy / Andreas Verras / Kenneth Borrelli / Angela V Toms / Neelu Kaila / Kevin D Kreutter / Joshua J McElwee / Justin M Kollman / 要旨: Cytidine triphosphate synthase 1 (CTPS1) is necessary for an effective immune response, as revealed by severe immunodeficiency in CTPS1-deficient individuals [E. Martin ], [] [510], [288-292] ([2014]) ...Cytidine triphosphate synthase 1 (CTPS1) is necessary for an effective immune response, as revealed by severe immunodeficiency in CTPS1-deficient individuals [E. Martin ], [] [510], [288-292] ([2014]). CTPS1 expression is up-regulated in activated lymphocytes to expand CTP pools [E. Martin ], [] [510], [288-292] ([2014]), satisfying increased demand for nucleic acid and lipid synthesis [L. D. Fairbanks, M. Bofill, K. Ruckemann, H. A. Simmonds], [ ] [270], [29682-29689] ([1995]). Demand for CTP in other tissues is met by the CTPS2 isoform and nucleoside salvage pathways [E. Martin ], [] [510], [288-292] ([2014]). Selective inhibition of the proliferative CTPS1 isoform is therefore desirable in the treatment of immune disorders and lymphocyte cancers, but little is known about differences in regulation of the isoforms or mechanisms of known inhibitors. We show that CTP regulates both isoforms by binding in two sites that clash with substrates. CTPS1 is less sensitive to CTP feedback inhibition, consistent with its role in increasing CTP levels in proliferation. We also characterize recently reported small-molecule inhibitors, both CTPS1 selective and nonselective. Cryo-electron microscopy (cryo-EM) structures reveal these inhibitors mimic CTP binding in one inhibitory site, where a single amino acid substitution explains selectivity for CTPS1. The inhibitors bind to CTPS assembled into large-scale filaments, which for CTPS1 normally represents a hyperactive form of the enzyme [E. M. Lynch ], [] [24], [507-514] ([2017]). This highlights the utility of cryo-EM in drug discovery, particularly for cases in which targets form large multimeric assemblies not amenable to structure determination by other techniques. Both inhibitors also inhibit the proliferation of human primary T cells. The mechanisms of selective inhibition of CTPS1 lay the foundation for the design of immunosuppressive therapies. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 7mh1.cif.gz | 728.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7mh1.ent.gz | 616.4 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7mh1.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 7mh1_validation.pdf.gz | 1.2 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7mh1_full_validation.pdf.gz | 1.2 MB | 表示 | |
XML形式データ | 7mh1_validation.xml.gz | 60.9 KB | 表示 | |
CIF形式データ | 7mh1_validation.cif.gz | 91 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/mh/7mh1 ftp://data.pdbj.org/pub/pdb/validation_reports/mh/7mh1 | HTTPS FTP |
-関連構造データ
関連構造データ | 23833MC 7mgzC 7mh0C 7mifC 7migC 7mihC 7miiC 7mipC 7miuC 7mivC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 (文献) |
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類似構造データ |
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
#1: タンパク質 | 分子量: 65759.430 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CTPS2 / 発現宿主: Saccharomyces cerevisiae (パン酵母) 参照: UniProt: Q9NRF8, CTP synthase (glutamine hydrolysing) #2: 化合物 | ChemComp-CTP / #3: 化合物 | ChemComp-MG / 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: FILAMENT / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: CTPS2 tetramer / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Saccharomyces cerevisiae (パン酵母) |
緩衝液 | pH: 7.9 |
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 |
-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: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD |
撮影 | 電子線照射量: 90 e/Å2 / 検出モード: SUPER-RESOLUTION フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-解析
EM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: 2.8 Å / 解像度の算出法: FSC 0.5 CUT-OFF / 粒子像の数: 46236 / 対称性のタイプ: POINT |