8dg5 | pdb_00008dg5

Structural Basis of MicroRNA Biogenesis by Dicer-1 and Its Partner Protein Loqs-PB - complex IIb

spinqualitylabelsall models 8dg5, resolution 3.26Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8dg5 is a 3 chain structure with sequence from Drosophila melanogaster. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.26Å Ligands: MG, U5P Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DCR1_DROME Endoribonuclease which functions in microRNA- (miRNA) gene silencing and, independently of its ribonuclease III activity, also acts in the short interfering RNA- (siRNA) gene silencing pathway (PubMed:11201747, PubMed:11498593, PubMed:15066283, PubMed:15918769, PubMed:15985611, PubMed:17666393, PubMed:17928574, PubMed:19451544, PubMed:19635780, PubMed:21419681, PubMed:21926993, PubMed:24488111, PubMed:36182693). Cleaves hairpin precursor miRNAs (pre-miRNA) to generate mature miRNAs (miRNAs) that are between twenty-one to twenty-four nucleotides in length and function in RNA silencing and post-transcriptional regulation of gene expression (PubMed:15066283, PubMed:15918769, PubMed:15985611, PubMed:17666393, PubMed:17928574, PubMed:19451544, PubMed:19635780, PubMed:21419681, PubMed:21926993, PubMed:23063653, PubMed:24488111, PubMed:36182693). Also functions in miRNA loading and assembly of the Argonaute 1 (AGO1)-containing RNA-induced silencing complex (miRISC), with the miRNAs serving as a guide to direct the miRISC to complementary RNAs to degrade them or prevent their translation (PubMed:15066283, PubMed:17928574, PubMed:19451544). Independently of its catalytic activity, functions in the siRNA silencing pathway by promoting assembly of the siRNA-directed Argonaute 2 (AGO2)-containing RISC (siRISC) (PubMed:15066283). Required for the proper formation of a stable intermediate (R2) in siRISC assembly, which is formed from the R1 precursor complex (containing Dcr-2, R2D2 and the siRNA) and is used for assembly of the mature (R3) siRISC complex (PubMed:15066283). It is not required for siRNA biogenesis (PubMed:15066283, PubMed:21419681). During embryogenesis, involved in germline fate determination (PubMed:16949822). Publication Abstract from PubMed In animals and plants, Dicer enzymes collaborate with double-stranded RNA-binding domain (dsRBD) proteins to convert precursor-microRNAs (pre-miRNAs) into miRNA duplexes. We report six cryo-EM structures of Drosophila Dicer-1 that show how Dicer-1 and its partner Loqs‑PB cooperate (1) before binding pre-miRNA, (2) after binding and in a catalytically competent state, (3) after nicking one arm of the pre-miRNA, and (4) following complete dicing and initial product release. Our reconstructions suggest that pre-miRNA binds a rare, open conformation of the Dicer‑1⋠Loqs‑PB heterodimer. The Dicer-1 dsRBD and three Loqs‑PB dsRBDs form a tight belt around the pre-miRNA, distorting the RNA helix to place the scissile phosphodiester bonds in the RNase III active sites. Pre-miRNA cleavage shifts the dsRBDs and partially closes Dicer-1, which may promote product release. Our data suggest a model for how the Dicer‑1⋠Loqs‑PB complex affects a complete cycle of pre-miRNA recognition, stepwise endonuclease cleavage, and product release. Structural basis of microRNA biogenesis by Dicer-1 and its partner protein Loqs-PB.,Jouravleva K, Golovenko D, Demo G, Dutcher RC, Hall TMT, Zamore PD, Korostelev AA Mol Cell. 2022 Nov 3;82(21):4049-4063.e6. doi: 10.1016/j.molcel.2022.09.002. Epub , 2022 Sep 30. PMID:36182693 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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