2EB1

Crystal Structure of the C-Terminal RNase III Domain of Human Dicer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Homodimeric Structure and Double-stranded RNA Cleavage Activity of the C-terminal RNase III Domain of Human Dicer

Takeshita, D.Zenno, S.Lee, W.C.Nagata, K.Saigo, K.Tanokura, M.

(2007) J.Mol.Biol. 374: 106-120

  • DOI: 10.1016/j.jmb.2007.08.069

  • PubMed Abstract: 
  • Human Dicer contains two RNase III domains (RNase IIIa and RNase IIIb) that are responsible for the production of short interfering RNAs and microRNAs. These small RNAs induce gene silencing known as RNA interference. Here, we report the crystal stru ...

    Human Dicer contains two RNase III domains (RNase IIIa and RNase IIIb) that are responsible for the production of short interfering RNAs and microRNAs. These small RNAs induce gene silencing known as RNA interference. Here, we report the crystal structure of the C-terminal RNase III domain (RNase IIIb) of human Dicer at 2.0 A resolution. The structure revealed that the RNase IIIb domain can form a tightly associated homodimer, which is similar to the dimers of the bacterial RNase III domains and the two RNase III domains of Giardia Dicer. Biochemical analysis showed that the RNase IIIb homodimer can cleave double-stranded RNAs (dsRNAs), and generate short dsRNAs with 2 nt 3' overhang, which is characteristic of RNase III products. The RNase IIIb domain contained two magnesium ions per monomer around the active site. The distance between two Mg-1 ions is approximately 20.6 A, almost identical with those observed in bacterial RNase III enzymes and Giardia Dicer, while the locations of two Mg-2 ions were not conserved at all. We presume that Mg-1 ions act as catalysts for dsRNA cleavage, while Mg-2 ions are involved in RNA binding.


    Organizational Affiliation

    Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Endoribonuclease Dicer
A, B, C
200Homo sapiensMutation(s): 0 
Gene Names: DICER1 (DICER, HERNA, KIAA0928)
EC: 3.1.26.3
Find proteins for Q9UPY3 (Homo sapiens)
Go to Gene View: DICER1
Go to UniProtKB:  Q9UPY3
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.211 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 88.602α = 90.00
b = 199.743β = 90.00
c = 119.640γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
MOLREPphasing
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance