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-Structure paper
| タイトル | Transcription activation mechanism of a noncanonical DNA damage response pathway by the WYL-activator, DriD. |
|---|---|
| ジャーナル・号・ページ | Sci Adv, Vol. 12, Issue 12, Page eaec6337, Year 2026 |
| 掲載日 | 2026年3月20日 |
著者 | Rajiv R Singh / Amani Chinni / Emily Cannistraci / Raul Salinas / Sunny Yadav / Kevin Gozzi / Maria A Schumacher / ![]() |
| PubMed 要旨 | DNA damage repair mechanisms are vital for cell survival. In the bacterium, , DriD is the master regulator of a unique, noncanonical DNA damage pathway. DriD binding to ssDNA, produced upon DNA ...DNA damage repair mechanisms are vital for cell survival. In the bacterium, , DriD is the master regulator of a unique, noncanonical DNA damage pathway. DriD binding to ssDNA, produced upon DNA damage, stimulates its ability to activate transcription from several promoters involved in DNA damage responses. However, the mechanism by which DriD interfaces with the RNAP holoenzyme to activate transcription from its multiple promoters has been unclear. Here, we describe cryo-EM structures of DriD-ssDNA bound to RNAP-holoenzyme and three DriD-regulated promoters. Each subunit of homodimeric DriD contains an DNA binding -terminal winged helix-turn-helix (wHTH) connected to WYL domains by a linker 3-helix bundle (3HB) module. The structures reveal a mechanism of assembly on promoters whereby DriD's 3HBs bind the RNAP α-CTD and β domains, anchoring the RNAP-holoenzyme to regulated promoters. The 3HBs form autoinhibitory contacts with DNABDs in apo DriD and therefore acts as an ssDNA-driven trigger domain, switching between DNABD-bound apo and RNAP-bound forms upon ssDNA-mediated activation. Thus, the structures reveal a unique transcription activation mechanism, likely conserved among the large family of homodimeric WYL activators. |
リンク | Sci Adv / PubMed:41861017 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.54 - 4.24 Å |
| 構造データ | EMDB-71610, PDB-9pfq: EMDB-71615, PDB-9pfv: EMDB-71624, PDB-9pga: EMDB-71632, PDB-9pgh: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | TRANSCRIPTION/DNA / bapE promoter transcription activation complex / DriD / Caulobacter / TRANSCRIPTION / Non-canonical DNA Repair / TRANSCRIPTION-DNA complex / CCNA_03891-CCNA_01149 promoter Transcription Activation Complex / didA promoter transcription activation complex / CCNA_03891-CCNA_01149 promoter complex / RNA Polymerase |
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caulobacter vibrioides na1000 (バクテリア)
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