4PJ3

Structural insight into the function and evolution of the spliceosomal helicase Aquarius, Structure of Aquarius in complex with AMPPNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

The RNA helicase Aquarius exhibits structural adaptations mediating its recruitment to spliceosomes.

De, I.Bessonov, S.Hofele, R.Dos Santos, K.Will, C.L.Urlaub, H.Luhrmann, R.Pena, V.

(2015) Nat Struct Mol Biol 22: 138-144

  • DOI: 10.1038/nsmb.2951
  • Primary Citation of Related Structures:  
    4PJ3

  • PubMed Abstract: 
  • Aquarius is a multifunctional putative RNA helicase that binds precursor-mRNA introns at a defined position. Here we report the crystal structure of human Aquarius, revealing a central RNA helicase core and several unique accessory domains, including an ARM-repeat domain ...

    Aquarius is a multifunctional putative RNA helicase that binds precursor-mRNA introns at a defined position. Here we report the crystal structure of human Aquarius, revealing a central RNA helicase core and several unique accessory domains, including an ARM-repeat domain. We show that Aquarius is integrated into spliceosomes as part of a pentameric intron-binding complex (IBC) that, together with the ARM domain, cross-links to U2 snRNP proteins within activated spliceosomes; this suggests that the latter aid in positioning Aquarius on the intron. Aquarius's ARM domain is essential for IBC formation, thus indicating that it has a key protein-protein-scaffolding role. Finally, we provide evidence that Aquarius is required for efficient precursor-mRNA splicing in vitro. Our findings highlight the remarkable structural adaptations of a helicase to achieve position-specific recruitment to a ribonucleoprotein complex and reveal a new building block of the human spliceosome.


    Organizational Affiliation

    Macromolecular Crystallography, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Intron-binding protein aquariusA1475Homo sapiensMutation(s): 0 
Gene Names: AQRKIAA0560
EC: 3.6.4.13
UniProt & NIH Common Fund Data Resources
Find proteins for O60306 (Homo sapiens)
Explore O60306 
Go to UniProtKB:  O60306
PHAROS:  O60306
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ANP (Subject of Investigation/LOI)
Query on ANP

Download Ideal Coordinates CCD File 
B [auth A]PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth A], D [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.986α = 90
b = 140.444β = 90
c = 144.761γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SHELXphasing
PDB_EXTRACTdata extraction
Cootmodel building
XSCALEdata scaling
SHELXDphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2015-02-11
    Changes: Database references
  • Version 1.2: 2015-02-25
    Changes: Database references
  • Version 1.3: 2016-06-01
    Changes: Data collection
  • Version 1.4: 2017-11-22
    Changes: Advisory, Derived calculations, Refinement description