4YBG

Crystal structure of the MAEL domain of Drosophila melanogaster Maelstrom


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal Structure and Activity of the Endoribonuclease Domain of the piRNA Pathway Factor Maelstrom

Matsumoto, N.Sato, K.Nishimasu, H.Namba, Y.Miyakubi, K.Dohmae, N.Ishitani, R.Siomi, H.Siomi, M.C.Nureki, O.

(2015) Cell Rep 11: 366-375

  • DOI: 10.1016/j.celrep.2015.03.030
  • Primary Citation of Related Structures:  
    4YBG

  • PubMed Abstract: 
  • PIWI-interacting RNAs (piRNAs) protect the genome from transposons in animal gonads. Maelstrom (Mael) is an evolutionarily conserved protein, composed of a high-mobility group (HMG) domain and a MAEL domain, and is essential for piRNA-mediated transc ...

    PIWI-interacting RNAs (piRNAs) protect the genome from transposons in animal gonads. Maelstrom (Mael) is an evolutionarily conserved protein, composed of a high-mobility group (HMG) domain and a MAEL domain, and is essential for piRNA-mediated transcriptional transposon silencing in various species, such as Drosophila and mice. However, its structure and biochemical function have remained elusive. Here, we report the crystal structure of the MAEL domain from Drosophila melanogaster Mael, at 1.6 Å resolution. The structure reveals that the MAEL domain has an RNase H-like fold but lacks canonical catalytic residues conserved among RNase H-like superfamily nucleases. Our biochemical analyses reveal that the MAEL domain exhibits single-stranded RNA (ssRNA)-specific endonuclease activity. Our cell-based analyses further indicate that ssRNA cleavage activity appears dispensable for piRNA-mediated transcriptional transposon silencing in Drosophila. Our findings provide clues toward understanding the multiple roles of Mael in the piRNA pathway.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo 113-0032, Japan. Electronic address: nureki@bs.s.u-tokyo.ac.jp.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein maelstromA255Drosophila melanogasterMutation(s): 1 
Gene Names: maelCG11254
Find proteins for Q9VNS0 (Drosophila melanogaster)
Explore Q9VNS0 
Go to UniProtKB:  Q9VNS0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download CCD File 
A
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.892α = 90
b = 71.892β = 90
c = 88.389γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SHARPphasing
Cootmodel building

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-04-29
    Type: Initial release
  • Version 1.1: 2015-05-06
    Changes: Database references
  • Version 1.2: 2020-02-05
    Changes: Data collection, Derived calculations, Source and taxonomy