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Investigating the role of the latch in the positive supercoiling mechanism of reverse gyrase.

Biochemistry. 2003 May 27;42(20):5993-6004. doi:10.1021/bi034188l
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摘要


Reverse gyrase is the only topoisomerase known to positively supercoil DNA and the only protein unique to hyperthermophiles. The enzyme comprises an N-terminal ATPase domain and a C-terminal topoisomerase I domain, which interact to couple the hydrolysis of ATP to the overwinding of DNA. The part of the ATPase domain termed the "latch" represses topoisomerase activity in the absence of nucleotide. Here I provide evidence that the latch, in addition to its regulatory role, participates in the supercoiling mechanism during the DNA cleavage and religation steps. The latch also contributes to the coordination of ATP hydrolysis and positive supercoiling by inhibiting ATPase activity in the absence of supercoiling. The latch therefore plays an important role in the communication between the two domains of reverse gyrase.

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