6LXD image
Entry Detail
PDB ID:
6LXD
EMDB ID:
Title:
Pri-miRNA bound DROSHA-DGCR8 complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-02-10
Release Date:
2020-04-15
Method Details:
Experimental Method:
Resolution:
3.90 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ribonuclease 3
Mutations:E1045Q, E1222Q
Chain IDs:A
Chain Length:990
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Microprocessor complex subunit DGCR8
Chain IDs:B, C
Chain Length:773
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polyribonucleotide
Description:RNA (102-mer)
Chain IDs:D
Chain Length:102
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural Basis for pri-miRNA Recognition by Drosha.
Mol.Cell 78 423 ? (2020)
PMID: 32220645 DOI: 10.1016/j.molcel.2020.02.024

Abstact

A commencing and critical step in miRNA biogenesis involves processing of pri-miRNAs in the nucleus by Microprocessor. An important, but not completely understood, question is how Drosha, the catalytic subunit of Microprocessor, binds pri-miRNAs and correctly specifies cleavage sites. Here we report the cryoelectron microscopy structures of the Drosha-DGCR8 complex with and without a pri-miRNA. The RNA-bound structure provides direct visualization of the tertiary structure of pri-miRNA and shows that a helix hairpin in the extended PAZ domain and the mobile basic (MB) helix in the RNase IIIa domain of Drosha coordinate to recognize the single-stranded to double-stranded junction of RNA, whereas the dsRNA binding domain makes extensive contacts with the RNA stem. Furthermore, the RNA-free structure reveals an autoinhibitory conformation of the PAZ helix hairpin. These findings provide mechanistic insights into pri-miRNA cleavage site selection and conformational dynamics governing pri-miRNA recognition by the catalytic component of Microprocessor.

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Primary Citation of related structures