+検索条件
-Structure paper
| タイトル | Sequential structural rearrangements at the PAM-distal site of a type I-F3 CRISPR-Cas effector enabling RNA-guided DNA transposition. |
|---|---|
| ジャーナル・号・ページ | Nucleic Acids Res, Vol. 54, Issue 1, Year 2026 |
| 掲載日 | 2026年1月5日 |
著者 | Kazuki Ishihara / Shunsuke Matsumoto / Christoph Gerle / Chai C Gopalasingam / Hideki Shigematsu / Tsuyoshi Shirai / Tomoyuki Numata / ![]() |
| PubMed 要旨 | Some prokaryotes carry CRISPR-associated transposons (CASTs), Tn7-like elements that incorporate genes encoding CRISPR-Cas effectors. CAST insertion is directed by CRISPR-Cas effectors through RNA- ...Some prokaryotes carry CRISPR-associated transposons (CASTs), Tn7-like elements that incorporate genes encoding CRISPR-Cas effectors. CAST insertion is directed by CRISPR-Cas effectors through RNA-guided DNA binding and interactions with transposition-associated proteins. Although efficient sequence-specific DNA integration requires both precise target DNA recognition and coordinated interactions between effectors and transposition-associated proteins, the underlying mechanism remains elusive. Here, we determined three cryo-EM structures of target DNA-bound type I-F3 TniQ-Cascade from Vibrio parahaemolyticus, revealing how Cas8/5 recognizes the protospacer adjacent motif (PAM) and identifying a key residue responsible for the cytidine preference at position -2 of the PAM. We revealed mismatch tolerance at the PAM-proximal site. Structural analyses showed that correct base pairing at the PAM-distal site correlates with conformational changes in the Cas8/5 helical bundle and TniQ, bending the DNA to guide its downstream region toward the transposition machinery. Together, these dynamic rearrangements at the PAM-distal region provide insights into the licensing mechanism of type I-F3 CAST transposition and highlight its potential for genome engineering applications. |
リンク | Nucleic Acids Res / PubMed:41495894 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.68 - 2.89 Å |
| 構造データ | EMDB-65338, PDB-9vtp: EMDB-65339, PDB-9vtq: EMDB-65340, PDB-9vtr: |
| 化合物 | ![]() ChemComp-MG: |
| 由来 |
|
キーワード | DNA BINDING PROTEIN / CRISPR-associated transposon |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク






vibrio parahaemolyticus rimd 2210633 (腸炎ビブリオ)
キーワード