Structural basis of phosphorylation-induced activation of the response regulator VbrR.

Structural basis of phosphorylation-induced activation of the response regulator VbrR.
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磷酸化诱导反应调节剂 VbrR 激活的结构基础。

DOI:
10.3724/abbs.2022200
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发表时间:
2023-01-25
影响因子:
3.7
通讯作者:
Yu F
Yu F
中科院分区:
生物学3区
文献类型:
--
作者:
Hong S;Guo J;Zhang X;Zhou X;Zhang P;Yu F

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双组分系统通常由成对的组氨酸激酶和反应调节器组成,并将环境变化与适应性反应结合起来。副溶血性弧菌的反应调节因子VbrR是OmpR/Phob家族的成员之一,它调控毒力和抗生素耐药基因。VbrR的激活机制尚不清楚。在这里,我们报道了全长VbrR与DNA在活性构象中的络合物以及在活性构象和非活性构象中的N-端接收域(RD)和C-端DNA结合域(DBD)的晶体结构。结构和生化分析表明,非磷酸化的VbrR在自身抑制状态下主要以非活性二聚体的形式通过DBD。在磷酸化后,RD经历了从单体到二聚体的转变,这进一步诱导了DBD从自抑制二聚体到活性二聚体的转变,并使其能够与靶DNA结合。我们的研究提出了一种新的磷酸化诱导反应调节因子激活的模型,并为副溶血性弧菌的致病机制提供了线索。
Two-component systems typically consist of a paired histidine kinase and response regulator and couple environmental changes to adaptive responses. The response regulator VbrR from Vibrio parahaemolyticus, a member of the OmpR/PhoB family, regulates virulence and antibiotic resistance genes. The activation mechanism of VbrR remains unclear. Here, we report the crystal structures of full-length VbrR in complex with DNA in the active conformation and the N-terminal receiver domain (RD) and the C-terminal DNA-binding domain (DBD) in both active and inactive conformations. Structural and biochemical analyses suggest that unphosphorylated VbrR adopts mainly as inactive dimers through the DBD at the autoinhibitory state. The RD undergoes a monomer-to-dimer transition upon phosphorylation, which further induces the transition of DBD from an autoinhibitory dimer to an active dimer and enables its binding with target DNA. Our study suggests a new model for phosphorylation-induced activation of response regulators and sheds light on the pathogenesis of V. parahaemolyticus.
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