ジャーナル: Cell / 年: 2015 タイトル: An Atypical AAA+ ATPase Assembly Controls Efficient Transposition through DNA Remodeling and Transposase Recruitment. 著者: Ernesto Arias-Palomo / James M Berger / 要旨: Transposons are ubiquitous genetic elements that drive genome rearrangements, evolution, and the spread of infectious disease and drug-resistance. Many transposons, such as Mu, Tn7, and IS21, require ...Transposons are ubiquitous genetic elements that drive genome rearrangements, evolution, and the spread of infectious disease and drug-resistance. Many transposons, such as Mu, Tn7, and IS21, require regulatory AAA+ ATPases for function. We use X-ray crystallography and cryo-electron microscopy to show that the ATPase subunit of IS21, IstB, assembles into a clamshell-shaped decamer that sandwiches DNA between two helical pentamers of ATP-associated AAA+ domains, sharply bending the duplex into a 180° U-turn. Biochemical studies corroborate key features of the structure and further show that the IS21 transposase, IstA, recognizes the IstB•DNA complex and promotes its disassembly by stimulating ATP hydrolysis. Collectively, these studies reveal a distinct manner of higher-order assembly and client engagement by a AAA+ ATPase and suggest a mechanistic model where IstB binding and subsequent DNA bending primes a selected insertion site for efficient transposition.
ダウンロード / ファイル: emd_3032.map.gz / 形式: CCP4 / 大きさ: 11.1 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
IstB decamer bound to ATP
ボクセルのサイズ
X=Y=Z: 2.05 Å
密度
表面レベル
登録者による: 0.0125 / ムービー #1: 0.0125
最小 - 最大
-0.00432957 - 0.05730631
平均 (標準偏差)
0.0005459 (±0.0035429)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
0
0
0
サイズ
144
144
144
Spacing
144
144
144
セル
A=B=C: 295.19998 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
2.05
2.05
2.05
M x/y/z
144
144
144
origin x/y/z
0.000
0.000
0.000
length x/y/z
295.200
295.200
295.200
α/β/γ
90.000
90.000
90.000
MAP C/R/S
1
2
3
start NC/NR/NS
0
0
0
NC/NR/NS
144
144
144
D min/max/mean
-0.004
0.057
0.001
-
添付データ
-
試料の構成要素
-
全体 : ATP-bound IstB decamer
全体
名称: ATP-bound IstB decamer
要素
試料: ATP-bound IstB decamer
タンパク質・ペプチド: IstB
-
超分子 #1000: ATP-bound IstB decamer
超分子
名称: ATP-bound IstB decamer / タイプ: sample / ID: 1000 / 詳細: The sample was monodisperse 集合状態: IstB oligomerizes into pentamer of dimers when bound to ATP Number unique components: 1