8DVI

T4 bacteriophage primosome with single strand DNA, State 2

8DVI の概要

• エントリーDOI: 10.2210/pdb8dvi/pdb
• 関連するPDBエントリー: 8DTP 8DUE 8DUO 8DVF
• EMDBエントリー: 27739
• 分子名称: DnaB-like replicative helicase, DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3'), DNA primase, ... (6 entities in total)
• 機能のキーワード: phage, complex, helicase, replication-dna-rna complex, replication/dna/rna
• 由来する生物種: Escherichia phage T4; 詳細
• タンパク質・核酸の鎖数: 9
• 化学式量合計: 369698.28

構造登録者

Feng, X.,Li, H. (登録日: 2022-07-29, 公開日: 2023-06-14, 最終更新日: 2023-08-23)

主引用文献

Feng, X.,Spiering, M.M.,de Luna Almeida Santos, R.,Benkovic, S.J.,Li, H.
Structural basis of the T4 bacteriophage primosome assembly and primer synthesis.
Nat Commun, 14:4396-4396, 2023

PubMed Abstract: The T4 bacteriophage gp41 helicase and gp61 primase assemble into a primosome to couple DNA unwinding with RNA primer synthesis for DNA replication. How the primosome is assembled and how the primer length is defined are unclear. Here we report a series of cryo-EM structures of T4 primosome assembly intermediates. We show that gp41 alone is an open spiral, and ssDNA binding triggers a large-scale scissor-like conformational change that drives the ring closure and activates the helicase. Helicase activation exposes a cryptic hydrophobic surface to recruit the gp61 primase. The primase binds the helicase in a bipartite mode in which the N-terminal Zn-binding domain and the C-terminal RNA polymerase domain each contain a helicase-interacting motif that bind to separate gp41 N-terminal hairpin dimers, leading to the assembly of one primase on the helicase hexamer. Our study reveals the T4 primosome assembly process and sheds light on the RNA primer synthesis mechanism.

PubMed: 37474605
DOI: 10.1038/s41467-023-40106-2

実験手法

ELECTRON MICROSCOPY (3.2 Å)