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-Structure paper
タイトル | A unique binding between SspA and RNAP βNTH across low-GC Gram-negative bacteria facilitates SspA-mediated transcription regulation. |
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ジャーナル・号・ページ | Biochem Biophys Res Commun, Vol. 583, Page 86-92, Year 2021 |
掲載日 | 2021年10月27日 |
著者 | Fulin Wang / Yu Feng / Zhuo Shang / Wei Lin / |
PubMed 要旨 | Stringent starvation protein A (SspA) involved in nucleotide metabolism, acid tolerance and virulence of bacteria has been demonstrated to function as a transcription factor to regulate σ-dependent ...Stringent starvation protein A (SspA) involved in nucleotide metabolism, acid tolerance and virulence of bacteria has been demonstrated to function as a transcription factor to regulate σ-dependent gene transcription through interacting with σ region 4 and the zinc binding domain (ZBD) of E. coli RNA polymerase (EcoRNAP) β' subunit simultaneously. Despite extensive biochemical and structural analyses were reported recently, the interactions of SspA with RNAP are not comprehensively understood. Here, we reprocessed our previous cryo-EM dataset of EcoRNAP-promoter open complex with SspA (SspA-RPo) and obtained a significantly improved density map. Unexpectedly, the new map showed that SspA interacts with both N-terminal helix of β' subunit (β'ΝΤΗ) and ω subunit, which contributes to stabilize the SspA-EcoRNAP σ holoenzyme complex. Sequence alignments and phylogenetic tree analyses of N-terminal sequences of β' subunit from different classes of bacteria revealed that β'ΝΤΗ is highly conserved and exclusively found in low-GC-content Gram-negative bacteria that harbor SspA, implying a co-evolution of β'ΝΤΗ and SspA. The transcription assays of wild-type SspA and its mutants demonstrated the interaction between SspA and β'ΝΤΗ facilitates the transcription regulation of SspA. Together, our results provide a more comprehensive insight into the interactions between SspA and RNAP and their roles in bacterial transcription regulation. |
リンク | Biochem Biophys Res Commun / PubMed:34735884 |
手法 | EM (単粒子) |
解像度 | 3.68 Å |
構造データ | EMDB-30914, PDB-7dy6: |
化合物 | ChemComp-MG: ChemComp-ZN: |
由来 |
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キーワード | TRANSCRIPTION / bacterial RNA polymerase / Complex |