- EMDB-36225: Cryo-EM structure of the SaCas9-sgRNA-AcrIIA15-promoter DNA dimer -
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基本情報
登録情報
データベース: EMDB / ID: EMD-36225
タイトル
Cryo-EM structure of the SaCas9-sgRNA-AcrIIA15-promoter DNA dimer
マップデータ
試料
複合体: SaCas9-sgRNA-AcrIIA15-promoter DNA complex
複合体: SaCas9
タンパク質・ペプチド: CRISPR-associated endonuclease Cas9
複合体: sgRNA
RNA: sgRNA
複合体: AcrIIA15
タンパク質・ペプチド: AcrIIA15
複合体: DNA
DNA: DNA (25-MER)
DNA: DNA (25-MER)
キーワード
II-A type anti-CRISPR protein / VIRAL PROTEIN
機能・相同性
機能・相同性情報
maintenance of CRISPR repeat elements / endonuclease activity / defense response to virus / 加水分解酵素; エステル加水分解酵素 / DNA binding / RNA binding / metal ion binding 類似検索 - 分子機能
National Natural Science Foundation of China (NSFC)
31930065
中国
National Natural Science Foundation of China (NSFC)
31725008
中国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: An anti-CRISPR that represses its own transcription while blocking Cas9-target DNA binding. 著者: Xieshuting Deng / Wei Sun / Xueyan Li / Jiuyu Wang / Zhi Cheng / Gang Sheng / Yanli Wang / 要旨: AcrIIA15 is an anti-CRISPR (Acr) protein that inhibits Staphylococcus aureus Cas9 (SaCas9). Although previous studies suggested it has dual functions, the structural and biochemical basis for its two ...AcrIIA15 is an anti-CRISPR (Acr) protein that inhibits Staphylococcus aureus Cas9 (SaCas9). Although previous studies suggested it has dual functions, the structural and biochemical basis for its two activities remains unclear. Here, we determined the cryo-EM structure of AcrIIA15 in complex with SaCas9-sgRNA to reveal the inhibitory mechanism of the Acr's C-terminal domain (CTD) in mimicking dsDNA to block protospacer adjacent motif (PAM) recognition. For the N-terminal domain (NTD), our crystal structures of the AcrIIA15-promoter DNA show that AcrIIA15 dimerizes through its NTD to recognize double-stranded (ds) DNA. Further, AcrIIA15 can simultaneously bind to both SaCas9-sgRNA and promoter DNA, creating a supercomplex of two Cas9s bound to two CTDs converging on a dimer of the NTD bound to a dsDNA. These findings shed light on AcrIIA15's inhibitory mechanisms and its autoregulation of transcription, enhancing our understanding of phage-host interactions and CRISPR defense.