+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8fhw | ||||||
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タイトル | Cryo-EM structure of Cryptococcus neoformans trehalose-6-phosphate synthase homotetramer in complex with uridine diphosphate and glucose-6-phosphate | ||||||
要素 | Alpha,alpha-trehalose-phosphate synthase (UDP-forming) | ||||||
キーワード | TRANSFERASE / Glycosyltransferase / Complex | ||||||
機能・相同性 | Glycosyl transferase, family 20 / Glycosyltransferase family 20 / trehalose biosynthetic process / hexosyltransferase activity / 6-O-phosphono-alpha-D-glucopyranose / URIDINE-5'-DIPHOSPHATE / Alpha,alpha-trehalose-phosphate synthase (UDP-forming) 機能・相同性情報 | ||||||
生物種 | Cryptococcus neoformans var. grubii H99 (菌類) | ||||||
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: 3.2 Å | ||||||
データ登録者 | Washington, E.J. / Brennan, R.G. | ||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: bioRxiv / 年: 2024 タイトル: Structures of trehalose-6-phosphate synthase, Tps1, from the fungal pathogen : a target for novel antifungals. 著者: Erica J Washington / Ye Zhou / Allen L Hsu / Matthew Petrovich / Jennifer L Tenor / Dena L Toffaletti / Ziqiang Guan / John R Perfect / Mario J Borgnia / Alberto Bartesaghi / Richard G Brennan 要旨: Invasive fungal diseases are a major threat to human health, resulting in more than 1.5 million annual deaths worldwide. The arsenal of antifungal therapeutics remains limited and is in dire need of ...Invasive fungal diseases are a major threat to human health, resulting in more than 1.5 million annual deaths worldwide. The arsenal of antifungal therapeutics remains limited and is in dire need of novel drugs that target additional biosynthetic pathways that are absent from humans. One such pathway involves the biosynthesis of trehalose. Trehalose is a disaccharide that is required for pathogenic fungi to survive in their human hosts. In the first step of trehalose biosynthesis, trehalose-6-phosphate synthase (Tps1) converts UDP-glucose and glucose-6-phosphate to trehalose-6-phosphate. Here, we report the structures of full-length Tps1 (CnTps1) in unliganded form and in complex with uridine diphosphate and glucose-6-phosphate. Comparison of these two structures reveals significant movement towards the catalytic pocket by the N-terminus upon ligand binding and identifies residues required for substrate-binding, as well as residues that stabilize the tetramer. Intriguingly, an intrinsically disordered domain (IDD), which is conserved amongst Cryptococcal species and closely related Basidiomycetes, extends from each subunit of the tetramer into the "solvent" but is not visible in density maps. We determined that the IDD is not required for Tps1-dependent thermotolerance and osmotic stress survival. Studies with UDP-galactose highlight the exquisite substrate specificity of CnTps1. , these studies expand our knowledge of trehalose biosynthesis in and highlight the potential of developing antifungal therapeutics that disrupt the synthesis of this disaccharide or the formation of a functional tetramer and the use of cryo-EM in the structural characterization of CnTps1-ligand/drug complexes. SIGNIFICANCE STATEMENT: Fungal infections are responsible for over a million deaths worldwide each year. Biosynthesis of a disaccharide, trehalose, is required for multiple pathogenic fungi to ...SIGNIFICANCE STATEMENT: Fungal infections are responsible for over a million deaths worldwide each year. Biosynthesis of a disaccharide, trehalose, is required for multiple pathogenic fungi to transition from the environment to the human host. Enzymes in the trehalose biosynthesis pathway are absent in humans and, therefore, are potentially significant targets for novel antifungal therapeutics. One enzyme in the trehalose biosynthesis is trehalose-6-phosphate synthase (Tps1). Here, we describe the cryo-electron microscopy structures of the CnTps1 homo-tetramer in the unliganded form and in complex with a substrate and a product. These structures and subsequent biochemical analysis reveal key details of substrate-binding residues and substrate specificity. These structures should facilitate structure-guided design of inhibitors against CnTps1. | ||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8fhw.cif.gz | 563.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8fhw.ent.gz | 461.2 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8fhw.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 | 8fhw_validation.pdf.gz | 1.6 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8fhw_full_validation.pdf.gz | 1.6 MB | 表示 | |
XML形式データ | 8fhw_validation.xml.gz | 59.6 KB | 表示 | |
CIF形式データ | 8fhw_validation.cif.gz | 87 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/fh/8fhw ftp://data.pdbj.org/pub/pdb/validation_reports/fh/8fhw | HTTPS FTP |
-関連構造データ
関連構造データ | 29172MC 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 | 類似検索 - 機能・相同性F&H 検索 |
-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: 76815.500 Da / 分子数: 4 / 由来タイプ: 組換発現 / 詳細: UDP G6P 由来: (組換発現) Cryptococcus neoformans var. grubii H99 (菌類) 遺伝子: CNAG_05292 / プラスミド: pMCSG7 / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) / Variant (発現宿主): C41 / 参照: UniProt: J9VJZ1 #2: 化合物 | ChemComp-UDP / #3: 糖 | ChemComp-G6P / 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: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: Cryo-EM structure of Cryptococcus neoformans trehalose-6-phosphate synthase homotetramer in complex with uridine diphosphate and glucose-6-phosphate タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.307 MDa / 実験値: YES |
由来(天然) | 生物種: Cryptococcus neoformans var. grubii H99 (菌類) |
由来(組換発現) | 生物種: Escherichia coli (大腸菌) / 株: C41(DE3) / プラスミド: pMCSG7 |
緩衝液 | pH: 7.5 |
試料 | 濃度: 0.75 mg/ml / 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: OTHER |
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): 800 nm |
撮影 | 電子線照射量: 60 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
-解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3次元再構成 | 解像度: 3.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 854608 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
精密化 | 交差検証法: NONE 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 48.64 Å2 | ||||||||||||||||||||||||
拘束条件 |
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