8FCW

Cryo-EM structure of TnsC-DNA complex in type I-B CAST system

8FCW の概要

• エントリーDOI: 10.2210/pdb8fcw/pdb
• EMDBエントリー: 28997
• 分子名称: TnsC, DNA (60-MER), ADENOSINE-5'-TRIPHOSPHATE, ... (5 entities in total)
• 機能のキーワード: transposon, tnsc, tniq, dna, dna binding protein
• 由来する生物種: Nostoc sp. 'Peltigera membranacea cyanobiont' 210A; 詳細
• タンパク質・核酸の鎖数: 7
• 化学式量合計: 257250.79

構造登録者

Chang, L.,Wang, S. (登録日: 2022-12-01, 公開日: 2023-08-09, 最終更新日: 2024-01-31)

主引用文献

Wang, S.,Gabel, C.,Siddique, R.,Klose, T.,Chang, L.
Molecular mechanism for Tn7-like transposon recruitment by a type I-B CRISPR effector.
Cell, 186:4204-4215.e19, 2023

PubMed Abstract: Tn7-like transposons have co-opted CRISPR-Cas systems to facilitate the movement of their own DNA. These CRISPR-associated transposons (CASTs) are promising tools for programmable gene knockin. A key feature of CASTs is their ability to recruit Tn7-like transposons to nuclease-deficient CRISPR effectors. However, how Tn7-like transposons are recruited by diverse CRISPR effectors remains poorly understood. Here, we present the cryo-EM structure of a recruitment complex comprising the Cascade complex, TniQ, TnsC, and the target DNA in the type I-B CAST from Peltigera membranacea cyanobiont 210A. Target DNA recognition by Cascade induces conformational changes in Cas6 and primes TniQ recruitment through its C-terminal domain. The N-terminal domain of TniQ is bound to the seam region of the TnsC spiral heptamer. Our findings provide insights into the diverse mechanisms for the recruitment of Tn7-like transposons to CRISPR effectors and will aid in the development of CASTs as gene knockin tools.

PubMed: 37557170
DOI: 10.1016/j.cell.2023.07.010

実験手法

ELECTRON MICROSCOPY (2.87 Å)