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-Structure paper
タイトル | Structural organization of a Type III-A CRISPR effector subcomplex determined by X-ray crystallography and cryo-EM. |
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ジャーナル・号・ページ | Nucleic Acids Res, Vol. 47, Issue 7, Page 3765-3783, Year 2019 |
掲載日 | 2019年4月23日 |
著者 | Bryan W Dorsey / Lei Huang / Alfonso Mondragón / |
PubMed 要旨 | Clustered regularly interspaced short palindromic repeats (CRISPR) and their associated Cas proteins provide an immune-like response in many prokaryotes against extraneous nucleic acids. CRISPR-Cas ...Clustered regularly interspaced short palindromic repeats (CRISPR) and their associated Cas proteins provide an immune-like response in many prokaryotes against extraneous nucleic acids. CRISPR-Cas systems are classified into different classes and types. Class 1 CRISPR-Cas systems form multi-protein effector complexes that includes a guide RNA (crRNA) used to identify the target for destruction. Here we present crystal structures of Staphylococcus epidermidis Type III-A CRISPR subunits Csm2 and Csm3 and a 5.2 Å resolution single-particle cryo-electron microscopy (cryo-EM) reconstruction of an in vivo assembled effector subcomplex including the crRNA. The structures help to clarify the quaternary architecture of Type III-A effector complexes, and provide details on crRNA binding, target RNA binding and cleavage, and intermolecular interactions essential for effector complex assembly. The structures allow a better understanding of the organization of Type III-A CRISPR effector complexes as well as highlighting the overall similarities and differences with other Class 1 effector complexes. |
リンク | Nucleic Acids Res / PubMed:30759237 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.4 - 5.2 Å |
構造データ | EMDB-0442: PDB-6nbt: PDB-6nbu: |
化合物 | ChemComp-CA: ChemComp-SM: ChemComp-HOH: |
由来 |
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キーワード | RNA BINDING PROTEIN / CRISPR / RNA Binding / RNA Recognition Motif / Samarium (III) chloride / STRUCTURAL PROTEIN |