Guiding strand passage: DNA-induced movement of the gyrase C-terminal domains defines an early step in the supercoiling cycle.

Guiding strand passage: DNA-induced movement of the gyrase C-terminal domains defines an early step in the supercoiling cycle.
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DOI:
10.1093/nar/gkr680
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发表时间:
2011-12
影响因子:
14.9
通讯作者:
Klostermeier D
Klostermeier D
中科院分区:
生物学2区
文献类型:
--
作者:
Lanz MA;Klostermeier D

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DNA促旋酶在链传递机制中催化DNA的ATP依赖性负超螺旋。DNA的双链区段,即T区段,通过促旋酶中三个蛋白质界面的协调关闭和打开而穿过瞬时切割的G区段中的差距。T-片段捕获被认为是由旋转酶的GyrA亚基的C-末端结构域引导的,所述结构域将DNA包裹在其周边周围并引起具有正手性的DNA交叉。我们在这里表明,在没有DNA的情况下,C末端结构域处于向下的方向,但当DNA结合时,C末端结构域会向上摆动并旋转远离促旋酶体。C-末端结构域的向上移动是促旋酶催化循环中的早期事件,其由G-区段的结合和DNA与C-末端结构域的首次接触触发,并且有助于T-区段捕获和随后的链通过。
DNA gyrase catalyzes ATP-dependent negative supercoiling of DNA in a strand passage mechanism. A double-stranded segment of DNA, the T-segment, is passed through the gap in a transiently cleaved G-segment by coordinated closing and opening of three protein interfaces in gyrase. T-segment capture is thought to be guided by the C-terminal domains of the GyrA subunit of gyrase that wrap DNA around their perimeter and cause a DNA-crossing with a positive handedness. We show here that the C-terminal domains are in a downward-facing orientation in the absence of DNA, but swing up and rotate away from the gyrase body when DNA binds. The upward movement of the C-terminal domains is an early event in the catalytic cycle of gyrase that is triggered by binding of a G-segment, and first contacts of the DNA with the C-terminal domains, and contributes to T-segment capture and subsequent strand passage.
DOI: 10.1073/pnas.93.25.14416
发表时间: 1996-12-10
影响因子: 11.1
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