EMD-6906

Single-particle
5.7 Å
EMD-6906 Deposition: 07/02/2018
Map released: 09/05/2018
Last modified: 23/10/2024
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links

EMD-6906

Cryo-EM structure of human Dicer and its complexes with a pre-miRNA substrate

EMD-6906

Single-particle
5.7 Å
EMD-6906 Deposition: 07/02/2018
Map released: 09/05/2018
Last modified: 23/10/2024
Overview 3D View Sample Experiment Validation Volume Browser Additional data Links
Sample Organism: Homo sapiens
Sample: Dicer and trbp
Fitted models: 5zam (Avg. Q-score: 0.215)

Deposition Authors: Liu Z , Wang J
Cryo-EM Structure of Human Dicer and Its Complexes with a Pre-miRNA Substrate.
Liu Z , Wang J, Cheng H , Ke X , Sun L , Zhang QC, Wang HW
(2018) Cell , 173 , 1191 - 1203.e12
PUBMED: 29706542
DOI: doi:10.1016/j.cell.2018.03.080
ISSN: 1097-4172
Abstract:
Human Dicer (hDicer) is a multi-domain protein belonging to the RNase III family. It plays pivotal roles in small RNA biogenesis during the RNA interference (RNAi) pathway by processing a diverse range of double-stranded RNA (dsRNA) precursors to generate ∼22 nt microRNA (miRNA) or small interfering RNA (siRNA) products for sequence-directed gene silencing. In this work, we solved the cryoelectron microscopy (cryo-EM) structure of hDicer in complex with its cofactor protein TRBP and revealed the precise spatial arrangement of hDicer's multiple domains. We further solved structures of the hDicer-TRBP complex bound with pre-let-7 RNA in two distinct conformations. In combination with biochemical analysis, these structures reveal a property of the hDicer-TRBP complex to promote the stability of pre-miRNA's stem duplex in a pre-dicing state. These results provide insights into the mechanism of RNA processing by hDicer and illustrate the regulatory role of hDicer's N-terminal helicase domain.