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-Structure paper
タイトル | CryoEM structures of open dimers of gyrase A in complex with DNA illuminate mechanism of strand passage. |
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ジャーナル・号・ページ | Elife, Vol. 7, Year 2018 |
掲載日 | 2018年11月20日 |
著者 | Katarzyna M Soczek / Tim Grant / Peter B Rosenthal / Alfonso Mondragón / |
PubMed 要旨 | Gyrase is a unique type IIA topoisomerase that uses ATP hydrolysis to maintain the negatively supercoiled state of bacterial DNA. In order to perform its function, gyrase undergoes a sequence of ...Gyrase is a unique type IIA topoisomerase that uses ATP hydrolysis to maintain the negatively supercoiled state of bacterial DNA. In order to perform its function, gyrase undergoes a sequence of conformational changes that consist of concerted gate openings, DNA cleavage, and DNA strand passage events. Structures where the transported DNA molecule (T-segment) is trapped by the A subunit have not been observed. Here we present the cryoEM structures of two oligomeric complexes of open gyrase A dimers and DNA. The protein subunits in these complexes were solved to 4 Å and 5.2 Å resolution. One of the complexes traps a linear DNA molecule, a putative T-segment, which interacts with the open gyrase A dimers in two states, representing steps either prior to or after passage through the DNA-gate. The structures locate the T-segment in important intermediate conformations of the catalytic cycle and provide insights into gyrase-DNA interactions and mechanism. |
リンク | Elife / PubMed:30457554 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.0 - 6.35 Å |
構造データ | EMDB-9316, PDB-6n1p: |
由来 |
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キーワード | ISOMERASE/DNA / topoisomerase / oligomeric complex / DNA complex / gyrase / T-segment / ISOMERASE-DNA complex / ISOMERASE |