- EMDB-71115: Cas1-2/3 integration complex, 32 bp foreign DNA without PAM, firs... -
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基本情報
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データベース: EMDB / ID: EMD-71115
タイトル
Cas1-2/3 integration complex, 32 bp foreign DNA without PAM, first transesterification
マップデータ
試料
複合体: Integration complex formed by Cas1-2/3 integrase with integration host factor alpha and beta, the CRISPR leader and CRISPR array, and a short foreign DNA fragment
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM134867
米国
引用
ジャーナル: Structure / 年: 2025 タイトル: Structures reveal how the Cas1-2/3 integrase captures, delivers, and integrates foreign DNA into CRISPR loci. 著者: William S Henriques / Jarrett Bowman / Laina N Hall / Colin C Gauvin / Hui Wei / Huihui Kuang / Christina M Zimanyi / Edward T Eng / Andrew Santiago-Frangos / Blake Wiedenheft / 要旨: Cas1 and Cas2 are the hallmark proteins of prokaryotic adaptive immunity. However, these two proteins are often fused to other proteins and the functional association of these fusions often remain ...Cas1 and Cas2 are the hallmark proteins of prokaryotic adaptive immunity. However, these two proteins are often fused to other proteins and the functional association of these fusions often remain poorly understood. Here we purify and determine structures of Cas1 and the Cas2/3 fusion proteins from Pseudomonas aeruginosa at distinct stages of CRISPR adaptation. Collectively, these structures reveal a prominent, positively charged channel on one face of the integration complex that captures short fragments of foreign DNA. Foreign DNA binding triggers conformational changes in Cas2/3 that expose new DNA binding surfaces necessary for homing the DNA-bound integrase to specific CRISPR loci. The length of the foreign DNA substrate determines if Cas1-2/3 docks completely onto the CRISPR repeat to successfully catalyze two sequential transesterification reactions required for integration. Together, these structures clarify how the Cas1-2/3 proteins orchestrate foreign DNA capture, site-specific delivery, and integration of new DNA into the bacterial genome.
全体 : Integration complex formed by Cas1-2/3 integrase with integration...
全体
名称: Integration complex formed by Cas1-2/3 integrase with integration host factor alpha and beta, the CRISPR leader and CRISPR array, and a short foreign DNA fragment
要素
複合体: Integration complex formed by Cas1-2/3 integrase with integration host factor alpha and beta, the CRISPR leader and CRISPR array, and a short foreign DNA fragment
複合体: Cas1-2/3 integrase and associated proteins
複合体: Nucleic Acid
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超分子 #1: Integration complex formed by Cas1-2/3 integrase with integration...
超分子
名称: Integration complex formed by Cas1-2/3 integrase with integration host factor alpha and beta, the CRISPR leader and CRISPR array, and a short foreign DNA fragment タイプ: complex / ID: 1 / 親要素: 0
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超分子 #2: Cas1-2/3 integrase and associated proteins