7E90

Crystal structure of the receiver domain (D51E) of the response regulator VbrR from Vibrio parahaemolyticus

7E90 の概要

• エントリーDOI: 10.2210/pdb7e90/pdb
• 分子名称: DNA-binding response regulator (2 entities in total)
• 機能のキーワード: transcriptional regulation, receiver domain, response regulator, vbrr, vibrio parahaemolyticus, transcription
• 由来する生物種: Vibrio parahaemolyticus
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 27952.01

構造登録者

Cho, S.Y.,Yoon, S.I. (登録日: 2021-03-03, 公開日: 2021-04-28, 最終更新日: 2023-11-29)

主引用文献

Cho, S.Y.,Yoon, S.I.
Structural analysis of the activation and DNA interactions of the response regulator VbrR from Vibrio parahaemolyticus.
Biochem.Biophys.Res.Commun., 555:102-108, 2021

PubMed Abstract: VbrK and VbrR from the gastroenteritis-causing Vibrio parahaemolyticus are a histidine kinase and response regulator, respectively, that constitute a two-component regulatory system. VbrK responds to β-lactam antibiotics or nitrate and activates VbrR via phosphorylation. Consequently, VbrR transcriptionally regulates the expression of β-lactamase and ExsC and contributes to the survival or virulence of V. parahaemolyticus. Due to the unavailability of the VbrR structure, it remains unclear how VbrR is activated via its N-terminal receiver domain (RD) and recognizes dsDNA via its C-terminal DNA-binding domain (DBD). To reveal the mechanism underlying VbrR-mediated activation, we generated the phosphomimetic protein (VbrR) of the VbrR RD by replacing the D51 residue at the phosphorylation site with glutamate. VbrR exhibits a βα structure rather than the typical βα structure because it contains a unique two-stranded β-sheet. The VbrR structure represents an active state in which the D51E residue interacts with the T78 residue. As a result, the Y97 residue adopts an inward conformation, allowing VbrR to dimerize using the α4-β5-α5 face. These activation events are facilitated by a VbrR-specific residue, R52. Further structural study demonstrated that the VbrR DBD adopts a β-strand-decorated three-helix structure. Based on a comparative structural study, we propose that VbrR recognizes dsDNA by inserting the α8 helix into the major groove of dsDNA and interacting with the minor groove of dsDNA via the β11-β12 region. Our findings will provide a new avenue for development of new antibacterial drugs for treating V. parahaemolyticus infections.

PubMed: 33813268
DOI: 10.1016/j.bbrc.2021.03.114

実験手法

X-RAY DIFFRACTION (2.25 Å)