4D25

Crystal structure of the Bombyx mori Vasa helicase (E339Q) in complex with RNA and AMPPNP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

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Literature

RNA Clamping by Vasa Assembles a Pirna Amplifier Complex on Transposon Transcripts.

Xiol, J., Spinelli, P., Laussmann, M.A., Homolka, D., Yang, Z., Cora, E., Coute, Y., Conn, S., Kadlec, J., Sachidanandam, R., Kaksonen, M., Cusack, S., Ephrussi, A., Pillai, R.S.

(2014) Cell 157: 1698

  • DOI: 10.1016/j.cell.2014.05.018
  • Primary Citation of Related Structures:  
    4D25, 4D26

  • PubMed Abstract: 

    • Germline-specific Piwi-interacting RNAs (piRNAs) protect animal genomes against transposons and are essential for fertility. piRNAs targeting active transposons are amplified by the ping-pong cycle, which couples Piwi endonucleolytic slicing of target RNAs to biogenesis of new piRNAs ...

    Germline-specific Piwi-interacting RNAs (piRNAs) protect animal genomes against transposons and are essential for fertility. piRNAs targeting active transposons are amplified by the ping-pong cycle, which couples Piwi endonucleolytic slicing of target RNAs to biogenesis of new piRNAs. Here, we describe the identification of a transient Amplifier complex that mediates biogenesis of secondary piRNAs in insect cells. Amplifier is nucleated by the DEAD box RNA helicase Vasa and contains the two Piwi proteins participating in the ping-pong loop, the Tudor protein Qin/Kumo and antisense piRNA guides. These components assemble on the surface of Vasa's helicase domain, which functions as an RNA clamp to anchor Amplifier onto transposon transcripts. We show that ATP-dependent RNP remodeling by Vasa facilitates transfer of 5' sliced piRNA precursors between ping-pong partners, and loss of this activity causes sterility in Drosophila. Our results reveal the molecular basis for the small RNA amplification that confers adaptive immunity against transposons.

    Organizational Affiliation: 

    European Molecular Biology Laboratory, Grenoble Outstation, University Grenoble Alpes-EMBL-CNRS, 71 avenue des Martyrs, 38042, France; Unit for Virus Host-Cell Interactions, University Grenoble Alpes-EMBL-CNRS, 71 avenue des Martyrs, 38042, France. Electronic address: pillai@embl.fr.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BMVLG PROTEINA434Bombyx moriMutation(s): 2 
Gene Names: BmVLG
EC: 3.6.4.13
UniProt
Find proteins for O01378 (Bombyx mori)
Explore O01378 
Go to UniProtKB:  O01378
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO01378
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-R(*UP*GP*AP*CP*AP*UP)-3'B [auth D]6Bombyx mori
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP
Query on ANP
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C [auth A]PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N		 Ligand Interaction
GOL
Query on GOL
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E [auth D]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
MG
Query on MG
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D [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.48α = 90
b = 78.57β = 90
c = 104.58γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-18
    Type: Initial release
  • Version 1.1: 2014-07-02
    Changes: Database references