8XVC

CryoEM structure of ADP-DNA-MuB conformation1

8XVC の概要

• エントリーDOI: 10.2210/pdb8xvc/pdb
• EMDBエントリー: 38696
• 分子名称: ATP-dependent target DNA activator B, ADENOSINE-5'-DIPHOSPHATE (2 entities in total)
• 機能のキーワード: mub, mub-adp, ring, viral protein
• 由来する生物種: Escherichia phage Mu
• タンパク質・核酸の鎖数: 18
• 化学式量合計: 640446.01

構造登録者

Zhao, X.,Zhang, K.,Li, S. (登録日: 2024-01-14, 公開日: 2024-08-14, 最終更新日: 2025-07-02)

主引用文献

Zhao, X.,Gao, Y.,Gong, Q.,Zhang, K.,Li, S.
Elucidating the Architectural dynamics of MuB filaments in bacteriophage Mu DNA transposition.
Nat Commun, 15:6445-6445, 2024

PubMed Abstract: MuB is a non-specific DNA-binding protein and AAA+ ATPase that significantly influences the DNA transposition process of bacteriophage Mu, especially in target DNA selection for transposition. While studies have established the ATP-dependent formation of MuB filament as pivotal to this process, the high-resolution structure of a full-length MuB protomer and the underlying molecular mechanisms governing its oligomerization remain elusive. Here, we use cryo-EM to obtain a 3.4-Å resolution structure of the ATP(+)-DNA(+)-MuB helical filament, which encapsulates the DNA substrate within its axial channel. The structure categorizes MuB within the initiator clade of the AAA+ protein family and precisely locates the ATP and DNA binding sites. Further investigation into the oligomeric states of MuB show the existence of various forms of the filament. These findings lead to a mechanistic model where MuB forms opposite helical filaments along the DNA, exposing potential target sites on the bare DNA and then recruiting MuA, which stimulates MuB's ATPase activity and disrupts the previously formed helical structure. When this happens, MuB generates larger ring structures and dissociates from the DNA.

PubMed: 39085263
DOI: 10.1038/s41467-024-50722-1

実験手法

ELECTRON MICROSCOPY (4.32 Å)