2XC7

Solution Structure of PHAX-RBD in complex with ssRNA


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: LEAST ENERGY 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and RNA Recognition by the Snrna and Snorna Transport Factor Phax.

Mourao, A.Varrot, A.Mackereth, C.D.Cusack, S.Sattler, M.

(2010) RNA 16: 1205

  • DOI: 10.1261/rna.2009910
  • Primary Citation of Related Structures:  
    2W4S, 2XC7

  • PubMed Abstract: 
  • Small nuclear and small nucleolar RNAs (snRNAs and snoRNAs) are critical components of snRNPs and snoRNPs and play an essential role in the maturation of, respectively, mRNAs and rRNAs within the nucleus of eukaryotic cells. Complex and specific pathways exist for the assembly of snRNPs and snoRNPs, involving, for instance, nucleocytoplasmic transport of snRNAs and intranuclear transport between compartments of snoRNAs ...

    Small nuclear and small nucleolar RNAs (snRNAs and snoRNAs) are critical components of snRNPs and snoRNPs and play an essential role in the maturation of, respectively, mRNAs and rRNAs within the nucleus of eukaryotic cells. Complex and specific pathways exist for the assembly of snRNPs and snoRNPs, involving, for instance, nucleocytoplasmic transport of snRNAs and intranuclear transport between compartments of snoRNAs. The phosphorylated adaptor for nuclear export (PHAX) is required for nuclear export of snRNAs in metazoans and also involved in the intranuclear transport of snoRNAs to Cajal bodies. PHAX contains a conserved single-stranded nucleic acid binding domain (RNA_GG_bind domain) with no sequence homology with any other known RNA-binding module. Here, we report NMR and X-ray crystallography studies that elucidate the structural basis for RNA recognition by the PHAX RNA-binding domain (PHAX-RBD). The crystal structure of the RNA_GG_bind domain from the parasite Cryptosporidium parvum (Cp RBD) forms well-folded dimers in solution in the absence of any ligand. The human PHAX-RBD is monomeric and only adopts a tertiary fold upon RNA binding. The PHAX-RBD represents a novel helical fold and binds single-stranded RNA with micromolar affinity without sequence specificity. RNA recognition by human PHAX-RBD is consistent with mutational analysis that affects RNA binding and PHAX-mediated nuclear export. Our data suggest that the PHAX-RBD mediates auxiliary RNA contacts with the snRNA and snoRNA substrates that are required for transport and/or substrate release.


    Organizational Affiliation

    Institute of Structural Biology, Helmholtz Zentrum München, 85764 Neuherberg, Germany.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHOSPHORYLATED ADAPTER RNA EXPORT PROTEINA104Homo sapiensMutation(s): 0 
Gene Names: PHAXRNUXA
Find proteins for Q9H814 (Homo sapiens)
Explore Q9H814 
Go to UniProtKB:  Q9H814
NIH Common Fund Data Resources
PHAROS:  Q9H814
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-(AP*UP*CP*GP)-3'B [auth P]4N/A
    Protein Feature View
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    • Reference Sequence
    Experimental Data & Validation

    Experimental Data

    • Method: SOLUTION NMR
    • Conformers Calculated: 100 
    • Conformers Submitted: 10 
    • Selection Criteria: LEAST ENERGY 
    • OLDERADO: 2XC7 Olderado

    Structure Validation

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    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2010-04-28
      Type: Initial release
    • Version 1.1: 2011-05-08
      Changes: Version format compliance
    • Version 1.2: 2011-07-13
      Changes: Version format compliance