ジャーナル: bioRxiv / 年: 2025 タイトル: Distinct Quaternary States, Intermediates, and Autoinhibition During Loading of the DnaB-Replicative Helicase by the Phage λP Helicase Loader. 著者: Abhipsa Shatarupa / Dhanjai Brown / Paul Dominic B Olinares / Jillian Chase / Eta Isiorho / Brian T Chait / David Jeruzalmi 要旨: Replicative helicases require loader proteins for assembly at the origins of DNA replication. Multiple copies of the bacteriophage λP (P) loader bind to and load the DnaB (B) replicative helicase ...Replicative helicases require loader proteins for assembly at the origins of DNA replication. Multiple copies of the bacteriophage λP (P) loader bind to and load the DnaB (B) replicative helicase on replication-origin-derived single-stranded DNA. We find that the DnaB•λP complex exists in two forms: B P and B P . In the 2.66 Å cryo-EM model of B P , five copies of the λP loader assemble into a crown-like shape that tightly grips DnaB. In this complex, closed planar DnaB is reconfigured into an open spiral with a sufficiently sized breach to permit ssDNA to enter an internal chamber. The transition to the open spiral involves λP-mediated changes to the Docking Helix (DH)-Linker Helix (LH) interface. The loader directly stabilizes the open spiral. Unexpectedly, one λP chain in B P is bound across the breach, precluding entry of replication-origin-derived ssDNA into DnaB's central chamber. We suggest that the B P complex is an early intermediate in the helicase activation pathway wherein neither the DnaB helicase nor the λP loader has attained its final form. DnaB in this complex adopts a partially open planar configuration, termed ajar planar. The partially ordered λP loader assembly features a much looser interaction with DnaB. The ssDNA and ATP sites in both complexes are in a configuration ill-suited for binding or hydrolysis. Our work specifies the conformational changes required for the intermediate B P to transition to B P on the pathway to recruitment by the initiator protein complex to the replication origin.
全体 : Replication initiation intermediate with Escherichia coli DnaB he...
全体
名称: Replication initiation intermediate with Escherichia coli DnaB helicase and Phage Lambda loader P in a 6:6 stoichiometry ratio
要素
複合体: Replication initiation intermediate with Escherichia coli DnaB helicase and Phage Lambda loader P in a 6:6 stoichiometry ratio
複合体: Ecoli DnaB helicase
タンパク質・ペプチド: Replicative DNA helicase
複合体: Phage Lambda loader P
タンパク質・ペプチド: Helicase loader
リガンド: ADENOSINE-5'-DIPHOSPHATE
リガンド: MAGNESIUM ION
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超分子 #1: Replication initiation intermediate with Escherichia coli DnaB he...
超分子
名称: Replication initiation intermediate with Escherichia coli DnaB helicase and Phage Lambda loader P in a 6:6 stoichiometry ratio タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV 詳細: Protein BP (1.5 uM), ssDNA (1.875 uM), and LO-156-299-NHis (2.25 uM) was mixed at 1.25 and 1.5 molar excess, respectively. 3uL of the sample was added to a plasma-cleaned grid at 4 degrees ...詳細: Protein BP (1.5 uM), ssDNA (1.875 uM), and LO-156-299-NHis (2.25 uM) was mixed at 1.25 and 1.5 molar excess, respectively. 3uL of the sample was added to a plasma-cleaned grid at 4 degrees celsius, 100 percent humidity, blot force 4, blot time 4s, wait time 30s, total blots 1, and plunge-frozen into liquid nitrogen-cooled ethane..