- EMDB-1890: EcoR124 Type I DNA restriction-modification enzyme complex in clo... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-1890
タイトル
EcoR124 Type I DNA restriction-modification enzyme complex in closed state with bound 30bp cognate DNA fragment. 3D reconstruction by single particle analysis from negative stain EM.
マップデータ
EcoR124I R2 M2 S1 complex with 30bp DNA fragment bound (closed state). DNA is not visible in the negative stain images or map.
試料
試料: EcoR124I R2 M2 S1 complex with 30 bp cognate dsDNA fragment
EcoR124 / endonuclease / methyltransferase / type I restriction / DNA / HsdS / HsdM / HsdR / electron microscopy / negative stain / translocase / DEAD-box / ATPase
機能・相同性
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
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分子 #4: Deoxyribonucleic acid
分子
名称: Deoxyribonucleic acid / タイプ: dna / ID: 4 / Name.synonym: DNA / 分類: DNA / Structure: DOUBLE HELIX / Synthetic?: Yes
由来(天然)
生物種: synthetic construct (人工物)
分子量
理論値: 15 KDa
配列
文字列:
CCGTGCAGAA TTCGAGGTCG ACGGATCCGG
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実験情報
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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
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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
凍結
凍結剤: NONE / 装置: OTHER / 詳細: Negative stain
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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
2010年9月1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: 30 / 平均電子線量: 40 e/Å2 / 詳細: Scanned on Imacon scanner / ビット/ピクセル: 8