ジャーナル: Nat Commun / 年: 2022 タイトル: Structural basis of template strand deoxyuridine promoter recognition by a viral RNA polymerase. 著者: Alec Fraser / Maria L Sokolova / Arina V Drobysheva / Julia V Gordeeva / Sergei Borukhov / John Jumper / Konstantin V Severinov / Petr G Leiman / 要旨: Recognition of promoters in bacterial RNA polymerases (RNAPs) is controlled by sigma subunits. The key sequence motif recognized by the sigma, the -10 promoter element, is located in the non-template ...Recognition of promoters in bacterial RNA polymerases (RNAPs) is controlled by sigma subunits. The key sequence motif recognized by the sigma, the -10 promoter element, is located in the non-template strand of the double-stranded DNA molecule ~10 nucleotides upstream of the transcription start site. Here, we explain the mechanism by which the phage AR9 non-virion RNAP (nvRNAP), a bacterial RNAP homolog, recognizes the -10 element of its deoxyuridine-containing promoter in the template strand. The AR9 sigma-like subunit, the nvRNAP enzyme core, and the template strand together form two nucleotide base-accepting pockets whose shapes dictate the requirement for the conserved deoxyuridines. A single amino acid substitution in the AR9 sigma-like subunit allows one of these pockets to accept a thymine thus expanding the promoter consensus. Our work demonstrates the extent to which viruses can evolve host-derived multisubunit enzymes to make transcription of their own genes independent of the host.
名称: AR9 nvRNAP promoter complex / タイプ: complex / ID: 1 / キメラ: Yes / 親要素: 0 / 含まれる分子: #1 詳細: The complex consists of the AR9 nvRNAP holoenzyme and two copies of the same oligonucleotide containing the P077 promoter. Only three bases in one of the oligonucleotides are sufficiently ...詳細: The complex consists of the AR9 nvRNAP holoenzyme and two copies of the same oligonucleotide containing the P077 promoter. Only three bases in one of the oligonucleotides are sufficiently ordered for atomic model building.
由来(天然)
生物種: Bacillus phage AR9 (ファージ)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
濃度
10 mg/mL
緩衝液
pH: 6.8
グリッド
モデル: Quantifoil R1.2/1.3 / 材質: COPPER
凍結
凍結剤: ETHANE
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 平均電子線量: 43.68 e/Å2