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-Structure paper
タイトル | Structural basis of σ appropriation. |
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ジャーナル・号・ページ | Nucleic Acids Res, Vol. 47, Issue 17, Page 9423-9432, Year 2019 |
掲載日 | 2019年9月26日 |
著者 | Jing Shi / Aijia Wen / Minxing Zhao / Linlin You / Yu Zhang / Yu Feng / |
PubMed 要旨 | Bacteriophage T4 middle promoters are activated through a process called σ appropriation, which requires the concerted effort of two T4-encoded transcription factors: AsiA and MotA. Despite ...Bacteriophage T4 middle promoters are activated through a process called σ appropriation, which requires the concerted effort of two T4-encoded transcription factors: AsiA and MotA. Despite extensive biochemical and genetic analyses, puzzle remains, in part, because of a lack of precise structural information for σ appropriation complex. Here, we report a single-particle cryo-electron microscopy (cryo-EM) structure of an intact σ appropriation complex, comprising AsiA, MotA, Escherichia coli RNA polymerase (RNAP), σ70 and a T4 middle promoter. As expected, AsiA binds to and remodels σ region 4 to prevent its contact with host promoters. Unexpectedly, AsiA undergoes a large conformational change, takes over the job of σ region 4 and provides an anchor point for the upstream double-stranded DNA. Because σ region 4 is conserved among bacteria, other transcription factors may use the same strategy to alter the landscape of transcription immediately. Together, the structure provides a foundation for understanding σ appropriation and transcription activation. |
リンク | Nucleic Acids Res / PubMed:31392983 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.79 Å |
構造データ | |
化合物 | ChemComp-MG: ChemComp-ZN: |
由来 |
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キーワード | TRANSCRIPTION / RNA polymerase / sigma appropriation / transcription activation / promoter |