ジャーナル: Nucleic Acids Res / 年: 2013 タイトル: Structural insight into negative DNA supercoiling by DNA gyrase, a bacterial type 2A DNA topoisomerase. 著者: Julie Papillon / Jean-François Ménétret / Claire Batisse / Reynald Hélye / Patrick Schultz / Noëlle Potier / Valérie Lamour / 要旨: Type 2A DNA topoisomerases (Topo2A) remodel DNA topology during replication, transcription and chromosome segregation. These multisubunit enzymes catalyze the transport of a double-stranded DNA ...Type 2A DNA topoisomerases (Topo2A) remodel DNA topology during replication, transcription and chromosome segregation. These multisubunit enzymes catalyze the transport of a double-stranded DNA through a transient break formed in another duplex. The bacterial DNA gyrase, a target for broad-spectrum antibiotics, is the sole Topo2A enzyme able to introduce negative supercoils. We reveal here for the first time the architecture of the full-length Thermus thermophilus DNA gyrase alone and in a cleavage complex with a 155 bp DNA duplex in the presence of the antibiotic ciprofloxacin, using cryo-electron microscopy. The structural organization of the subunits of the full-length DNA gyrase points to a central role of the ATPase domain acting like a 'crossover trap' that may help to sequester the DNA positive crossover before strand passage. Our structural data unveil how DNA is asymmetrically wrapped around the gyrase-specific C-terminal β-pinwheel domains and guided to introduce negative supercoils through cooperativity between the ATPase and β-pinwheel domains. The overall conformation of the drug-induced DNA binding-cleavage complex also suggests that ciprofloxacin traps a DNA pre-transport conformation.
ダウンロード / ファイル: emd_2361.map.gz / 形式: CCP4 / 大きさ: 26.4 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Recontruction of the full length Thermus thermophilus DNA gyrase bound to DNA.
ボクセルのサイズ
X=Y=Z: 1.92 Å
密度
表面レベル
登録者による: 0.55 / ムービー #1: 0.55
最小 - 最大
-1.24862158 - 3.11563373
平均 (標準偏差)
0.02745328 (±0.18016443)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
-96
-96
-96
サイズ
192
192
192
Spacing
192
192
192
セル
A=B=C: 368.63998 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
1.92
1.92
1.92
M x/y/z
192
192
192
origin x/y/z
0.000
0.000
0.000
length x/y/z
368.640
368.640
368.640
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
0
0
-40
NX/NY/NZ
55
55
81
MAP C/R/S
1
2
3
start NC/NR/NS
-96
-96
-96
NC/NR/NS
192
192
192
D min/max/mean
-1.249
3.116
0.027
-
添付データ
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試料の構成要素
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全体 : DNA-bound complex of Thermus thermophilus DNA gyrase with a 155bp...
全体
名称: DNA-bound complex of Thermus thermophilus DNA gyrase with a 155bp DNA in presence of ADPNP and ciprofoxacin.
要素
試料: DNA-bound complex of Thermus thermophilus DNA gyrase with a 155bp DNA in presence of ADPNP and ciprofoxacin.
タンパク質・ペプチド: DNA gyrase
DNA: linear DNA
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超分子 #1000: DNA-bound complex of Thermus thermophilus DNA gyrase with a 155bp...
超分子
名称: DNA-bound complex of Thermus thermophilus DNA gyrase with a 155bp DNA in presence of ADPNP and ciprofoxacin. タイプ: sample / ID: 1000 / 詳細: monodisperse complex / 集合状態: dimer / Number unique components: 1
名称: DNA gyrase / タイプ: protein_or_peptide / ID: 1 / Name.synonym: bacterial DNA topoisomerase 2A 詳細: The two subinits of the DNA gyrase were fused for structural stability. 集合状態: dimer / 組換発現: Yes
名称: linear DNA / タイプ: dna / ID: 2 詳細: A 155bp DNA was used to form the DNA-bound complex. ADPNP (a non hydrolyzable analog of ATP) and ciprofloxacin (quinolone antibiotic) were added to stabilize the complex 分類: DNA / Structure: DOUBLE HELIX / Synthetic?: No