Mouse endoribonuclease Dicer (composite structure)

Experimental Data Snapshot

  • Resolution: 3.84 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structural and functional basis of mammalian microRNA biogenesis by Dicer.

Zapletal, D.Taborska, E.Pasulka, J.Malik, R.Kubicek, K.Zanova, M.Much, C.Sebesta, M.Buccheri, V.Horvat, F.Jenickova, I.Prochazkova, M.Prochazka, J.Pinkas, M.Novacek, J.Joseph, D.F.Sedlacek, R.Bernecky, C.O'Carroll, D.Stefl, R.Svoboda, P.

(2022) Mol Cell 82: 4064-4079.e13

  • DOI: https://doi.org/10.1016/j.molcel.2022.10.010
  • Primary Citation of Related Structures:  
    7YYM, 7YYN, 7YZ4, 7ZPI, 7ZPJ, 7ZPK

  • PubMed Abstract: 

    MicroRNA (miRNA) and RNA interference (RNAi) pathways rely on small RNAs produced by Dicer endonucleases. Mammalian Dicer primarily supports the essential gene-regulating miRNA pathway, but how it is specifically adapted to miRNA biogenesis is unknown. We show that the adaptation entails a unique structural role of Dicer's DExD/H helicase domain. Although mice tolerate loss of its putative ATPase function, the complete absence of the domain is lethal because it assures high-fidelity miRNA biogenesis. Structures of murine Dicer•-miRNA precursor complexes revealed that the DExD/H domain has a helicase-unrelated structural function. It locks Dicer in a closed state, which facilitates miRNA precursor selection. Transition to a cleavage-competent open state is stimulated by Dicer-binding protein TARBP2. Absence of the DExD/H domain or its mutations unlocks the closed state, reduces substrate selectivity, and activates RNAi. Thus, the DExD/H domain structurally contributes to mammalian miRNA biogenesis and underlies mechanistical partitioning of miRNA and RNAi pathways.

  • Organizational Affiliation

    CEITEC-Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic; National Centre for Biomolecular Research, Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endoribonuclease Dicer2,004Mus musculusMutation(s): 0 
Gene Names: Dicer1DicerMdcr
UniProt & NIH Common Fund Data Resources
Find proteins for Q8R418 (Mus musculus)
Explore Q8R418 
Go to UniProtKB:  Q8R418
IMPC:  MGI:2177178
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8R418
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.84 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Czech Science FoundationCzech RepublicGA22-19896S
Ministry of Education, Youth and Sports of the Czech RepublicCzech RepublicLM2018127

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-16
    Type: Initial release