5A4A

Crystal structure of the OSK domain of Drosophila Oskar


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.699 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Crystal Structure of the Drosophila Germline Inducer Oskar Identifies Two Domains with Distinct Vasa Helicase-and RNA-Binding Activities.

Jeske, M.Bordi, M.Glatt, S.Muller, S.Rybin, V.Muller, C.W.Ephrussi, A.

(2015) Cell Rep. 12: 587

  • DOI: 10.1016/j.celrep.2015.06.055
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In many animals, the germ plasm segregates germline from soma during early development. Oskar protein is known for its ability to induce germ plasm formation and germ cells in Drosophila. However, the molecular basis of germ plasm formation remains u ...

    In many animals, the germ plasm segregates germline from soma during early development. Oskar protein is known for its ability to induce germ plasm formation and germ cells in Drosophila. However, the molecular basis of germ plasm formation remains unclear. Here, we show that Oskar is an RNA-binding protein in vivo, crosslinking to nanos, polar granule component, and germ cell-less mRNAs, each of which has a role in germline formation. Furthermore, we present high-resolution crystal structures of the two Oskar domains. RNA-binding maps in vitro to the C-terminal domain, which shows structural similarity to SGNH hydrolases. The highly conserved N-terminal LOTUS domain forms dimers and mediates Oskar interaction with the germline-specific RNA helicase Vasa in vitro. Our findings suggest a dual function of Oskar in RNA and Vasa binding, providing molecular clues to its germ plasm function.


    Organizational Affiliation

    Developmental Biology Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany; Structural and Computational Biology Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MATERNAL EFFECT PROTEIN OSKAR
A
208Drosophila melanogasterMutation(s): 0 
Gene Names: osk
Find proteins for P25158 (Drosophila melanogaster)
Go to UniProtKB:  P25158
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.699 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.166 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 68.430α = 90.00
b = 68.430β = 90.00
c = 101.070γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-07-29
    Type: Database references
  • Version 1.2: 2015-08-12
    Type: Database references
  • Version 1.3: 2017-08-23
    Type: Data collection