9GDS

Cryo-EM structure of Vibrio cholerae RNA polymerase Transcription Activation Complex with ToxR and TcpP transcription factors and a toxT promoter DNA fragment

9GDS の概要

• エントリーDOI: 10.2210/pdb9gds/pdb
• EMDBエントリー: 51277
• 分子名称: Toxin co-regulated pilus biosynthesis protein P, MAGNESIUM ION, ZINC ION, ... (11 entities in total)
• 機能のキーワード: rna polymerase, transcription activation complex, toxt, toxr, tcpp, vibrio cholerae, transcription
• 由来する生物種: Vibrio cholerae O395; 詳細
• タンパク質・核酸の鎖数: 12
• 化学式量合計: 602971.75

構造登録者

Alcaide-Jimenez, A.,Baudin, F.,Canals, A.,Machon, C.,Murciano, B.,Fabrega-Ferrer, M.,Bantysh, O.,Perez-Luque, R.,Krukonis, E.S.,Muller, C.W.,Coll, M. (登録日: 2024-08-06, 公開日: 2025-12-17, 最終更新日: 2026-01-28)

主引用文献

Alcaide-Jimenez, A.,Canals, A.,Baudin, F.,Machon, C.,Fabrega-Ferrer, M.,Bantysh, O.,Perez-Luque, R.,Murciano, B.,Mohammad, A.A.,Rowse, M.J.,Ferracciolo, J.M.,Krukonis, E.S.,Muller, C.W.,Coll, M.
Structures of Vibrio cholerae transcription complexes reveal how ToxR and TcpP recruit the RNA polymerase and activate virulence genes.
Sci Adv, 12:eadx9680-eadx9680, 2026

PubMed Abstract: Activation of virulence in , the etiological agent of cholera disease, is mediated by two transmembrane one-component signal-transduction proteins, ToxR and TcpP, which are also transcription factors. Using cryo-electron microscopy, we have solved five structures of the and transcription activation complexes, including the RNA polymerase (RNAP) holoenzyme, promoter DNAs, transcribed RNA, and their corresponding transcription factors, ToxR or TcpP and ToxR-TcpP, respectively. Activation is achieved through the interaction of ToxR or TcpP with the α-C-terminal repeat domain of RNAP where a single residue of the activator, a phenylalanine, appears to be the most critical contact, as confirmed by mutagenesis. No interactions of the transcription factors were observed with other subunits of the RNAP, i.e., the σ subunit as it occurs in the structurally related PhoB family of two-component transcription factors. The structures, and their comparison with our previously solved DNA promoter-ToxR x-ray structures, unveil the molecular mechanism of cholera virulence gene activation.

PubMed: 41533787
DOI: 10.1126/sciadv.adx9680

実験手法

ELECTRON MICROSCOPY (2.9 Å)