Macrophage Locus Protein A, C-terminal domain / Stringent starvation protein A, C-terminal / : / Glutathione S-transferase, N-terminal domain / Glutathione S-transferase, N-terminal domain / Glutathione S-transferase, C-terminal domain / Glutathione transferase family / Glutathione S-transferase, C-terminal / Glutathione S-transferase, C-terminal-like / Soluble glutathione S-transferase C-terminal domain profile. ...Macrophage Locus Protein A, C-terminal domain / Stringent starvation protein A, C-terminal / : / Glutathione S-transferase, N-terminal domain / Glutathione S-transferase, N-terminal domain / Glutathione S-transferase, C-terminal domain / Glutathione transferase family / Glutathione S-transferase, C-terminal / Glutathione S-transferase, C-terminal-like / Soluble glutathione S-transferase C-terminal domain profile. / Soluble glutathione S-transferase N-terminal domain profile. / Glutathione S-transferase, N-terminal / Glutathione S-transferase, C-terminal domain superfamily / Thioredoxin-like superfamily 類似検索 - ドメイン・相同性
GUANOSINE-5',3'-TETRAPHOSPHATE / GST N-terminal domain-containing protein / Macrophage growth locus, subunit A / Stringent starvation protein A, regulator of transcription / Transposase 類似検索 - 構成要素
ジャーナル: Mol Cell / 年: 2021 タイトル: Structural Basis for Virulence Activation of Francisella tularensis. 著者: Brady A Travis / Kathryn M Ramsey / Samantha M Prezioso / Thomas Tallo / Jamie M Wandzilak / Allen Hsu / Mario Borgnia / Alberto Bartesaghi / Simon L Dove / Richard G Brennan / Maria A Schumacher / 要旨: The bacterium Francisella tularensis (Ft) is one of the most infectious agents known. Ft virulence is controlled by a unique combination of transcription regulators: the MglA-SspA heterodimer, PigR, ...The bacterium Francisella tularensis (Ft) is one of the most infectious agents known. Ft virulence is controlled by a unique combination of transcription regulators: the MglA-SspA heterodimer, PigR, and the stress signal, ppGpp. MglA-SspA assembles with the σ-associated RNAP holoenzyme (RNAPσ), forming a virulence-specialized polymerase. These factors activate Francisella pathogenicity island (FPI) gene expression, which is required for virulence, but the mechanism is unknown. Here we report FtRNAPσ-promoter-DNA, FtRNAPσ-(MglA-SspA)-promoter DNA, and FtRNAPσ-(MglA-SspA)-ppGpp-PigR-promoter DNA cryo-EM structures. Structural and genetic analyses show MglA-SspA facilitates σ binding to DNA to regulate virulence and virulence-enhancing genes. Our Escherichia coli RNAPσhomodimeric EcSspA structure suggests this is a general SspA-transcription regulation mechanism. Strikingly, our FtRNAPσ-(MglA-SspA)-ppGpp-PigR-DNA structure reveals ppGpp binding to MglA-SspA tethers PigR to promoters. PigR in turn recruits FtRNAP αCTDs to DNA UP elements. Thus, these studies unveil a unique mechanism for Ft pathogenesis involving a virulence-specialized RNAP that employs two (MglA-SspA)-based strategies to activate virulence genes.
C: Stringent starvation protein A, regulator of transcription A: MglA D: Stringent starvation protein A, regulator of transcription B: MglA P: Peptide ヘテロ分子