- EMDB-63118: structure of phage T4 topoisomerase II central domain -
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基本情報
登録情報
データベース: EMDB / ID: EMD-63118
タイトル
structure of phage T4 topoisomerase II central domain
マップデータ
map
試料
複合体: Phage T4 topoisomerase II central domian apo state
タンパク質・ペプチド: DNA topoisomerase medium subunit
タンパク質・ペプチド: DNA topoisomerase large subunit,DNA topoisomerase small subunit
キーワード
topoisomerase II / ISOMERASE
機能・相同性
機能・相同性情報
sister chromatid segregation / DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) complex / DNA topoisomerase type II (double strand cut, ATP-hydrolyzing) activity / DNA topoisomerase (ATP-hydrolysing) / DNA topological change / protein-containing complex / DNA binding / ATP binding 類似検索 - 分子機能
C-terminal associated domain of TOPRIM / C-terminal associated domain of TOPRIM / DNA topoisomerase II, eukaryotic-type / : / Topoisomerase (Topo) IIA-type catalytic domain profile. / DNA topoisomerase, type IIA, alpha-helical domain superfamily / DNA topoisomerase, type IIA, domain A / DNA topoisomerase, type IIA, domain A, alpha-beta / DNA gyrase/topoisomerase IV, subunit A / DNA Topoisomerase IV ...C-terminal associated domain of TOPRIM / C-terminal associated domain of TOPRIM / DNA topoisomerase II, eukaryotic-type / : / Topoisomerase (Topo) IIA-type catalytic domain profile. / DNA topoisomerase, type IIA, alpha-helical domain superfamily / DNA topoisomerase, type IIA, domain A / DNA topoisomerase, type IIA, domain A, alpha-beta / DNA gyrase/topoisomerase IV, subunit A / DNA Topoisomerase IV / DNA topoisomerase, type IIA, subunit B, domain 2 / DNA gyrase B / DNA topoisomerase, type IIA / DNA topoisomerase, type IIA, conserved site / DNA topoisomerase II signature. / TopoisomeraseII / DNA topoisomerase, type IIA, subunit B, C-terminal / DNA topoisomerase, type IIA-like domain superfamily / Histidine kinase-, DNA gyrase B-, and HSP90-like ATPase / Histidine kinase-like ATPases / Histidine kinase/HSP90-like ATPase / Histidine kinase/HSP90-like ATPase superfamily / Ribosomal protein S5 domain 2-type fold, subgroup / Ribosomal protein S5 domain 2-type fold 類似検索 - ドメイン・相同性
DNA topoisomerase medium subunit / DNA topoisomerase large subunit / DNA topoisomerase small subunit 類似検索 - 構成要素
ジャーナル: Sci Adv / 年: 2025 タイトル: Direct trapping of the transport-segment DNA by the central domain of type IIA topoisomerases. 著者: Yuhui Xin / Runqi Xian / Congrong Liu / Oujia Zhang / Zihe Rao / Xuemei Li / Yutao Chen / 要旨: Type IIA topoisomerases modulate DNA topology by coordinating the cleavage of gate-segment DNA and the passage of transport-segment DNA-a mechanism conserved across species and essential for diverse ...Type IIA topoisomerases modulate DNA topology by coordinating the cleavage of gate-segment DNA and the passage of transport-segment DNA-a mechanism conserved across species and essential for diverse cellular processes. While gate-segment interactions have been extensively studied, direct structural evidence of transport-segment capture has remained elusive, limiting our understanding of the full catalytic cycle. Here, we present a cryo-electron microscopy structure of the T4 bacteriophage topoisomerase II with a transport-segment DNA bound directly to its central domain. The structure reveals conformational rearrangements in the central domain that accommodate the transport-segment DNA, suggesting an alternative sequence of events in which the enzyme sliding along the loosely bound religated gate segment may precede transport-segment passage through the coiled-coil gate. Supported by mutational and biochemical assays, our findings provide previously unidentified mechanistic insights and open potential avenues for the development of next-generation type IIA topoisomerase inhibitors.