- PDB-5mbv: Cryo-EM structure of Lambda Phage protein GamS bound to RecBCD. -
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基本情報
登録情報
データベース: PDB / ID: 5mbv
タイトル
Cryo-EM structure of Lambda Phage protein GamS bound to RecBCD.
要素
Host-nuclease inhibitor protein gam
RecBCD enzyme subunit RecB
RecBCD enzyme subunit RecC
RecBCD enzyme subunit RecD
キーワード
DNA BINDING PROTEIN / Inhibitor / Complex / DNA repair / Helicase/Nuclease
機能・相同性
機能・相同性情報
symbiont-mediated evasion of DNA end degradation by host / exodeoxyribonuclease V / exodeoxyribonuclease V activity / exodeoxyribonuclease V complex / deoxyribonuclease inhibitor activity / clearance of foreign intracellular DNA / DNA translocase activity / DNA 5'-3' helicase / single-stranded DNA helicase activity / recombinational repair ...symbiont-mediated evasion of DNA end degradation by host / exodeoxyribonuclease V / exodeoxyribonuclease V activity / exodeoxyribonuclease V complex / deoxyribonuclease inhibitor activity / clearance of foreign intracellular DNA / DNA translocase activity / DNA 5'-3' helicase / single-stranded DNA helicase activity / recombinational repair / DNA 3'-5' helicase / 3'-5' DNA helicase activity / ATP-dependent activity, acting on DNA / DNA helicase activity / DNA endonuclease activity / double-strand break repair via homologous recombination / helicase activity / response to radiation / 5'-3' DNA helicase activity / DNA recombination / symbiont-mediated suppression of host innate immune response / DNA damage response / magnesium ion binding / ATP hydrolysis activity / DNA binding / ATP binding / cytosol 類似検索 - 分子機能
ジャーナル: Elife / 年: 2016 タイトル: Structural basis for the inhibition of RecBCD by Gam and its synergistic antibacterial effect with quinolones. 著者: Martin Wilkinson / Luca Troman / Wan Ak Wan Nur Ismah / Yuriy Chaban / Matthew B Avison / Mark S Dillingham / Dale B Wigley / 要旨: Our previous paper (Wilkinson , 2016) used high-resolution cryo-electron microscopy to solve the structure of the RecBCD complex, which acts in both the repair of double-stranded DNA breaks and the ...Our previous paper (Wilkinson , 2016) used high-resolution cryo-electron microscopy to solve the structure of the RecBCD complex, which acts in both the repair of double-stranded DNA breaks and the degradation of bacteriophage DNA. To counteract the latter activity, bacteriophage λ encodes a small protein inhibitor called Gam that binds to RecBCD and inactivates the complex. Here, we show that Gam inhibits RecBCD by competing at the DNA-binding site. The interaction surface is extensive and involves molecular mimicry of the DNA substrate. We also show that expression of Gam in or increases sensitivity to fluoroquinolones; antibacterials that kill cells by inhibiting topoisomerases and inducing double-stranded DNA breaks. Furthermore, fluoroquinolone-resistance in clinical isolates is reversed by expression of Gam. Together, our data explain the synthetic lethality observed between topoisomerase-induced DNA breaks and the RecBCD gene products, suggesting a new co-antibacterial strategy.
分子量: 11661.924 Da / 分子数: 2 / Mutation: L79I same as crystal structure / 由来タイプ: 組換発現 詳細: GamL is cleaved at position Y44 when expressed in E.coli into GamS (see paper - pubmed id 17544443). We had the GamS gene synthesised to start at M41 for this project. It purifies as a dimer. 由来: (組換発現) Enterobacteria phage lambda (λファージ) 遺伝子: gam, gamma / プラスミド: pET22b / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) / 参照: UniProt: P03702
濃度: 1.4 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
試料支持
詳細: Grids were thinned by glow discharge in 30s steps with 1 minute wait in between treatments. Then left for 1-2 weeks prior to overnight treatment with 1 mM Ampiphol A8-35 to render surface ...詳細: Grids were thinned by glow discharge in 30s steps with 1 minute wait in between treatments. Then left for 1-2 weeks prior to overnight treatment with 1 mM Ampiphol A8-35 to render surface hydrophilic. Grids were washed with 5 drops of water prior to use. EMS グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: C-flat-1/1
急速凍結
装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 90 % / 凍結前の試料温度: 277 K / 詳細: 3 ul sample applied Blot force of -4 for 1 s