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基本情報
登録情報 | データベース: PDB / ID: 7urg | |||||||||
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タイトル | cryo-EM structure of ribonucleotide reductase from Synechococcus phage S-CBP4 bound with TTP | |||||||||
![]() | Ribonucleotide reductase | |||||||||
![]() | OXIDOREDUCTASE / ribonucleotide reductase / Synechoccus phage / TTP | |||||||||
機能・相同性 | : / Ribonucleotide reductase large subunit, C-terminal / Ribonucleotide reductase, barrel domain / cobalamin binding / ribonucleoside-diphosphate reductase activity, thioredoxin disulfide as acceptor / THYMIDINE-5'-TRIPHOSPHATE / Ribonucleotide reductase domain-containing protein![]() | |||||||||
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: 3.46 Å | |||||||||
![]() | Xu, D. / Burnim, A.A. / Ando, N. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Comprehensive phylogenetic analysis of the ribonucleotide reductase family reveals an ancestral clade. 著者: Andrew A Burnim / Matthew A Spence / Da Xu / Colin J Jackson / Nozomi Ando / ![]() ![]() 要旨: Ribonucleotide reductases (RNRs) are used by all free-living organisms and many viruses to catalyze an essential step in the de novo biosynthesis of DNA precursors. RNRs are remarkably diverse by ...Ribonucleotide reductases (RNRs) are used by all free-living organisms and many viruses to catalyze an essential step in the de novo biosynthesis of DNA precursors. RNRs are remarkably diverse by primary sequence and cofactor requirement, while sharing a conserved fold and radical-based mechanism for nucleotide reduction. Here, we structurally aligned the diverse RNR family by the conserved catalytic barrel to reconstruct the first large-scale phylogeny consisting of 6779 sequences that unites all extant classes of the RNR family and performed evo-velocity analysis to independently validate our evolutionary model. With a robust phylogeny in-hand, we uncovered a novel, phylogenetically distinct clade that is placed as ancestral to the classes I and II RNRs, which we have termed clade Ø. We employed small-angle X-ray scattering (SAXS), cryogenic-electron microscopy (cryo-EM), and AlphaFold2 to investigate a member of this clade from phage S-CBP4 and report the most minimal RNR architecture to-date. Based on our analyses, we propose an evolutionary model of diversification in the RNR family and delineate how our phylogeny can be used as a roadmap for targeted future study. | |||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.2 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.2 MB | 表示 | |
XML形式データ | ![]() | 37.9 KB | 表示 | |
CIF形式データ | ![]() | 52.6 KB | 表示 | |
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-関連構造データ
関連構造データ | ![]() 26712MC 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 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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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: 51421.672 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: SVPG_00036 / 発現宿主: ![]() ![]() #2: 化合物 | 研究の焦点であるリガンドがあるか | Y | Has protein modification | 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 |
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試料調製
構成要素 | 名称: Ribonucleotide reductase from Synechoccus phage S-CBP4 bound with TTP タイプ: COMPLEX / Entity ID: #1 / 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: 7.6 詳細: 50 mM HEPES, 150 mM NaCl, 1% v/v glycerol, 7.55 mM MgCl2 | |||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.2 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: 4 uM ribonucleotide reductase from Synechococcus phage S-CBP4 with 200 uM TTP, 200 uM GDP | |||||||||||||||||||||||||
試料支持 | 詳細: glow discharged on a PELCO easiGlow system for 45 s with 15 mA current グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | |||||||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K / 詳細: blot for 4 seconds before plunging |
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電子顕微鏡撮影
顕微鏡 | モデル: TFS TALOS 詳細: Data was collected on a Thermo Fisher Talos Arcica Cryo-TEM with a Gatan K3 camera and BioQuantum energy filter. |
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電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 79000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 600 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN / 試料ホルダーモデル: OTHER |
撮影 | 平均露光時間: 2.164 sec. / 電子線照射量: 50 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 856 |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 20 eV |
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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: 581884 詳細: 46 high quality micrographs were then selected, from which the blob picker routine was used to pick particles. The resulting 99k particles were extracted and subjected to 2D classification, ...詳細: 46 high quality micrographs were then selected, from which the blob picker routine was used to pick particles. The resulting 99k particles were extracted and subjected to 2D classification, and the top four unique 2D classes were selected and used as templates for template picking on the entire dataset. Due to the large variance in ice conditions in many of our micrographs, masks were manually defined for every micrograph, and particle picks outside the ideal ice region were excluded. | |||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.46 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 107885 / 対称性のタイプ: POINT | |||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 74.37 / プロトコル: FLEXIBLE FIT / 空間: REAL 詳細: The sequence for the ribonucleotide reductase from Synechococcus phage S-CBP4 was retrieved from UniProt with accession number M1PRZ0. The sequence was used as input for AlphaFold2 prediction ...詳細: The sequence for the ribonucleotide reductase from Synechococcus phage S-CBP4 was retrieved from UniProt with accession number M1PRZ0. The sequence was used as input for AlphaFold2 prediction with the five default model parameters and a template date cutoff of 2020-05-14. As the five models were largely identical in the core region and differing only in the location of the C-terminal tail, the structure predicted with the first model parameter was used in the subsequent process. The predicted structure was first processed and docked into the unsharpened map in phenix. The 25 N-terminal residues and 45 C-terminal residues were then manually removed due to lack of cryo-EM density, and residues 26-426 were retained in the model. We observed unmodeled density at the specificity site, and based on solution composition, we modeled a TTP molecule. The TTP molecule with magnesium ion from the crystal structure of Bacillus subtilis RNR (pdb: 6mt9) was extracted and rigid body fit into the unmodeled density in Coot. The combined model was refined with the unsharpened and sharpened maps using phenix.real_space_refine, with a constraint applied on the magnesium ion coordinated by the triphosphate in TTP according to the original configuration. Residue and loop conformations in the resulting structure were manually adjusted in Coot to maximize fit to map and input for an additional round of real-space refinement in phenix with an additional restraint for the disulfide bond between C30 and C196. Due to poor density of the magnesium ion, it was removed when deposited into PDB. |