Trapping of the transport-segment DNA by the ATPase domains of a type II topoisomerase.

Trapping of the transport-segment DNA by the ATPase domains of a type II topoisomerase.
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DOI:
10.1038/s41467-018-05005-x
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发表时间:
2018-07-03
影响因子:
16.6
通讯作者:
Sanderson MR
Sanderson MR
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Laponogov I;Pan XS;Veselkov DA;Skamrova GB;Umrekar TR;Fisher LM;Sanderson MR

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Type II topoisomerases alter DNA topology to control DNA supercoiling and chromosome segregation and are targets of clinically important anti-infective and anticancer therapeutics. They act as ATP-operated clamps to trap a DNA helix and transport it through a transient break in a second DNA. Here, we present the first X-ray crystal structure solved at 2.83 Å of a closed clamp complete with trapped T-segment DNA obtained by co-crystallizing the ATPase domain of S. pneumoniae topoisomerase IV with a nonhydrolyzable ATP analogue and 14-mer duplex DNA. The ATPase dimer forms a 22 Å protein hole occupied by the kinked DNA bound asymmetrically through positively charged residues lining the hole, and whose mutagenesis impacts the DNA decatenation, DNA relaxation and DNA-dependent ATPase activities of topo IV. These results and a side-bound DNA-ParE structure help explain how the T-segment DNA is captured and transported by a type II topoisomerase, and reveal a new enzyme–DNA interface for drug discovery. Type 2 topoisomerases alter DNA supercoiling by an ATP-dependent reaction involving DNA passage through a cleaved DNA duplex. Here the authors present the crystal structure of the ParE ATPase domains of S. pneumoniae topoisomerase IV, in complex with a captured DNA oligonucleotide.
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