+検索条件
-Structure paper
タイトル | Essential structural and functional roles of the Cmr4 subunit in RNA cleavage by the Cmr CRISPR-Cas complex. |
---|---|
ジャーナル・号・ページ | Cell Rep, Vol. 9, Issue 5, Page 1610-1617, Year 2014 |
掲載日 | 2014年12月11日 |
著者 | Nancy F Ramia / Michael Spilman / Li Tang / Yaming Shao / Joshua Elmore / Caryn Hale / Alexis Cocozaki / Nilakshee Bhattacharya / Rebecca M Terns / Michael P Terns / Hong Li / Scott M Stagg / |
PubMed 要旨 | The Cmr complex is the multisubunit effector complex of the type III-B clustered regularly interspaced short palindromic repeats (CRISPR)-Cas immune system. The Cmr complex recognizes a target RNA ...The Cmr complex is the multisubunit effector complex of the type III-B clustered regularly interspaced short palindromic repeats (CRISPR)-Cas immune system. The Cmr complex recognizes a target RNA through base pairing with the integral CRISPR RNA (crRNA) and cleaves the target at multiple regularly spaced locations within the complementary region. To understand the molecular basis of the function of this complex, we have assembled information from electron microscopic and X-ray crystallographic structural studies and mutagenesis of a complete Pyrococcus furiosus Cmr complex. Our findings reveal that four helically packed Cmr4 subunits, which make up the backbone of the Cmr complex, act as a platform to support crRNA binding and target RNA cleavage. Interestingly, we found a hook-like structural feature associated with Cmr4 that is likely the site of target RNA binding and cleavage. Our results also elucidate analogies in the mechanisms of crRNA and target molecule binding by the distinct Cmr type III-A and Cascade type I-E complexes. |
リンク | Cell Rep / PubMed:25482566 / PubMed Central |
手法 | EM (単粒子) / EM (らせん対称) / X線回折 |
解像度 | 2.85 - 13.0 Å |
構造データ | EMDB-6165: EMDB-6166: EMDB-6167: PDB-4rdp: |
由来 |
|
キーワード | RNA BINDING PROTEIN / RRM / Ferredoxin-like fold |