- PDB-5f9r: Crystal structure of catalytically-active Streptococcus pyogenes ... -
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データベース: PDB / ID: 5f9r
タイトル
Crystal structure of catalytically-active Streptococcus pyogenes CRISPR-Cas9 in complex with single-guided RNA and double-stranded DNA primed for target DNA cleavage
要素
CRISPR-associated endonuclease Cas9/Csn1
DNA (30-MER)
DNA (5'-D(P*AP*TP*GP*AP*GP*AP*CP*GP*CP*TP*GP*GP*AP*GP*TP*AP*CP*AP*C)-3')
maintenance of CRISPR repeat elements / 3'-5' exonuclease activity / DNA 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
ジャーナル: Science / 年: 2016 タイトル: Structures of a CRISPR-Cas9 R-loop complex primed for DNA cleavage. 著者: Fuguo Jiang / David W Taylor / Janice S Chen / Jack E Kornfeld / Kaihong Zhou / Aubri J Thompson / Eva Nogales / Jennifer A Doudna / 要旨: Bacterial adaptive immunity and genome engineering involving the CRISPR (clustered regularly interspaced short palindromic repeats)-associated (Cas) protein Cas9 begin with RNA-guided DNA unwinding ...Bacterial adaptive immunity and genome engineering involving the CRISPR (clustered regularly interspaced short palindromic repeats)-associated (Cas) protein Cas9 begin with RNA-guided DNA unwinding to form an RNA-DNA hybrid and a displaced DNA strand inside the protein. The role of this R-loop structure in positioning each DNA strand for cleavage by the two Cas9 nuclease domains is unknown. We determine molecular structures of the catalytically active Streptococcus pyogenes Cas9 R-loop that show the displaced DNA strand located near the RuvC nuclease domain active site. These protein-DNA interactions, in turn, position the HNH nuclease domain adjacent to the target DNA strand cleavage site in a conformation essential for concerted DNA cutting. Cas9 bends the DNA helix by 30°, providing the structural distortion needed for R-loop formation.