- EMDB-31339: Cryo-EM structure of the Gp168-beta-clamp complex -
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基本情報
登録情報
データベース: EMDB / ID: EMD-31339
タイトル
Cryo-EM structure of the Gp168-beta-clamp complex
マップデータ
Cryo-EM structure of the Gp168-beta-clamp complex
試料
複合体: Gp168-beta-clamp complex
複合体: Beta sliding clamp 2
タンパク質・ペプチド: Beta sliding clamp
複合体: Gp168
タンパク質・ペプチド: Sliding clamp inhibitor
キーワード
gp168 / DNA beta-clamp / cross-species inhibitor / ANTIMICROBIAL PROTEIN
機能・相同性
機能・相同性情報
DNA polymerase III complex / DNA strand elongation involved in DNA replication / 3'-5' exonuclease activity / DNA-directed DNA polymerase activity / DNA binding / cytoplasm 類似検索 - 分子機能
DNA polymerase III, beta sliding clamp / DNA polymerase III, beta sliding clamp, N-terminal / DNA polymerase III, beta sliding clamp, C-terminal / DNA polymerase III, beta sliding clamp, central / DNA polymerase III beta subunit, N-terminal domain / DNA polymerase III beta subunit, central domain / DNA polymerase III beta subunit, C-terminal domain / DNA polymerase III beta subunit / : 類似検索 - ドメイン・相同性
National Natural Science Foundation of China (NSFC)
81871662
中国
引用
ジャーナル: Nucleic Acids Res / 年: 2021 タイトル: Bacteriophage Twort protein Gp168 is a β-clamp inhibitor by occupying the DNA sliding channel. 著者: Bing Liu / Shanshan Li / Yang Liu / Huan Chen / Zhenyue Hu / Zhihao Wang / Yimin Zhao / Lei Zhang / Biyun Ma / Hongliang Wang / Steve Matthews / Yawen Wang / Kaiming Zhang / 要旨: Bacterial chromosome replication is mainly catalyzed by DNA polymerase III, whose beta subunits enable rapid processive DNA replication. Enabled by the clamp-loading complex, the two beta subunits ...Bacterial chromosome replication is mainly catalyzed by DNA polymerase III, whose beta subunits enable rapid processive DNA replication. Enabled by the clamp-loading complex, the two beta subunits form a ring-like clamp around DNA and keep the polymerase sliding along. Given the essential role of β-clamp, its inhibitors have been explored for antibacterial purposes. Similarly, β-clamp is an ideal target for bacteriophages to shut off host DNA synthesis during host takeover. The Gp168 protein of phage Twort is such an example, which binds to the β-clamp of Staphylococcus aureus and prevents it from loading onto DNA causing replication arrest. Here, we report a cryo-EM structure of the clamp-Gp168 complex at 3.2-Å resolution. In the structure of the complex, the Gp168 dimer occupies the DNA sliding channel of β-clamp and blocks its loading onto DNA, which represents a new inhibitory mechanism against β-clamp function. Interestingly, the key residues responsible for this interaction on the β-clamp are well conserved among bacteria. We therefore demonstrate that Gp168 is potentially a cross-species β-clamp inhibitor, as it forms complex with the Bacillus subtilis β-clamp. Our findings reveal an alternative mechanism for bacteriophages to inhibit β-clamp and provide a new strategy to combat bacterial drug resistance.