- EMDB-1892: EcoR124 Type I DNA restriction-modification enzyme complex (in cl... -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: EMDB / ID: EMD-1892
タイトル
EcoR124 Type I DNA restriction-modification enzyme complex (in closed state) with bound DNA mimic protein Ocr from phage T7. 3D reconstruction by single particle analysis from negative stain EM.
マップデータ
3D reconstruction of EcoR124I Type I restriction enzyme complex with a bound antirestriction protein Ocr.
試料
試料: EcoR124I R2 M2 S1 complex with dimeric Ocr bound at target recognition domains
EcoR124 / endonuclease / methyltransferase / type I restriction / DNA mimic / HsdS / HsdM / HsdR / electron microscopy / negative stain / translocase / DEAD-box / ATPase / antirestriction / phage / T7
機能・相同性
Protein Ocr / Restriction endonuclease, type I, HsdR / Type I restriction modification DNA specificity domain / DNA methylase, adenine-specific / protein binding / DNA restriction-modification system
ジャーナル: Genes Dev / 年: 2012 タイトル: Structure and operation of the DNA-translocating type I DNA restriction enzymes. 著者: Christopher K Kennaway / James E N Taylor / Chun Feng Song / Wojciech Potrzebowski / William Nicholson / John H White / Anna Swiderska / Agnieszka Obarska-Kosinska / Philip Callow / Laurie P ...著者: Christopher K Kennaway / James E N Taylor / Chun Feng Song / Wojciech Potrzebowski / William Nicholson / John H White / Anna Swiderska / Agnieszka Obarska-Kosinska / Philip Callow / Laurie P Cooper / Gareth A Roberts / Jean-Baptiste Artero / Janusz M Bujnicki / John Trinick / G Geoff Kneale / David T F Dryden / 要旨: Type I DNA restriction/modification (RM) enzymes are molecular machines found in the majority of bacterial species. Their early discovery paved the way for the development of genetic engineering. ...Type I DNA restriction/modification (RM) enzymes are molecular machines found in the majority of bacterial species. Their early discovery paved the way for the development of genetic engineering. They control (restrict) the influx of foreign DNA via horizontal gene transfer into the bacterium while maintaining sequence-specific methylation (modification) of host DNA. The endonuclease reaction of these enzymes on unmethylated DNA is preceded by bidirectional translocation of thousands of base pairs of DNA toward the enzyme. We present the structures of two type I RM enzymes, EcoKI and EcoR124I, derived using electron microscopy (EM), small-angle scattering (neutron and X-ray), and detailed molecular modeling. DNA binding triggers a large contraction of the open form of the enzyme to a compact form. The path followed by DNA through the complexes is revealed by using a DNA mimic anti-restriction protein. The structures reveal an evolutionary link between type I RM enzymes and type II RM enzymes.
GO: DNA restriction-modification system / InterPro: Restriction endonuclease, type I, HsdR
-
分子 #4: ORF 0.3 Ocr antirestriction protein
分子
名称: ORF 0.3 Ocr antirestriction protein / タイプ: protein_or_peptide / ID: 4 / Name.synonym: Ocr 詳細: Ocr forms a dimer that mimics B-form DNA in shape and charge distrubution. コピー数: 2 / 集合状態: Dimer / 組換発現: Yes
由来(天然)
生物種: Enterobacteria phage T7 (ファージ) / 別称: T7
分子量
理論値: 27 KDa
組換発現
生物種: Escherichia coli (大腸菌)
配列
InterPro: Protein Ocr
-
実験情報
-
構造解析
手法
ネガティブ染色法
解析
単粒子再構成法
試料の集合状態
particle
-
試料調製
濃度
0.050 mg/mL
緩衝液
pH: 4.7 / 詳細: 20mM Tris-Cl, 100 mM NaCl
染色
タイプ: NEGATIVE 詳細: Protein was adsorbed onto UV treated carbon for 1 minute, blotted, then 1% uranyl acetate solution was applied for 1 min then blotted, three times.
グリッド
詳細: 400 mesh copper, continuous carbon
凍結
凍結剤: NONE / 装置: OTHER / 詳細: Negative stain
-
電子顕微鏡法
顕微鏡
JEOL 1200EXII
温度
平均: 294 K
アライメント法
Legacy - 非点収差: Corrected at 80,000x
詳細
Customised JEOL 1200 EX microscope, low dose mode.
日付
2011年1月13日
撮影
カテゴリ: FILM / フィルム・検出器のモデル: KODAK SO-163 FILM / デジタル化 - スキャナー: OTHER / デジタル化 - サンプリング間隔: 15 µm / 実像数: 7 / 平均電子線量: 40 e/Å2 / 詳細: Scanned on Imacon scanner / ビット/ピクセル: 8
1.5 Ocr (dimer) to EcoR124 molar ratio. The particles were manually selected using boxer. Smaller R1 complexes were removed by alignment and MSA classification.
CTF補正
詳細: Filtered at 1st zero
最終 再構成
想定した対称性 - 点群: C2 (2回回転対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 24.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: EMAN, IMAGIC 詳細: Refined in Imagic using anchor set. C2 symmetry imposed. 使用した粒子像数: 748
最終 角度割当
詳細: Euler angle range limited to plus minus 30 degrees from single axis of rotation
PDBEntryID_givenInChain. Protocol: rigid body. HsdR (2W00) was fitted into the density after the core methylase (HsdS and 2x HsdM) was fitted. Ocr docked into DNA binding sites (target recognition domains) in the methylase.
精密化
空間: RECIPROCAL / プロトコル: RIGID BODY FIT / 当てはまり具合の基準: cross-correlation