4NBO

Human steroid receptor RNA activator protein carboxy-terminal domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.807 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and function of steroid receptor RNA activator protein, the proposed partner of SRA noncoding RNA.

McKay, D.B.Xi, L.Barthel, K.K.Cech, T.R.

(2014) J.Mol.Biol. 426: 1766-1785

  • DOI: 10.1016/j.jmb.2014.01.006

  • PubMed Abstract: 
  • In a widely accepted model, the steroid receptor RNA activator protein (SRA protein; SRAP) modulates the transcriptional regulatory activity of SRA RNA by binding a specific stem-loop of SRA. We first confirmed that SRAP is present in the nucleus as ...

    In a widely accepted model, the steroid receptor RNA activator protein (SRA protein; SRAP) modulates the transcriptional regulatory activity of SRA RNA by binding a specific stem-loop of SRA. We first confirmed that SRAP is present in the nucleus as well as the cytoplasm of MCF-7 breast cancer cells, where it is expressed at the level of about 10(5) molecules per cell. However, our SRAP-RNA binding experiments, both in vitro with recombinant protein and in cultured cells with plasmid-expressed protein and RNA, did not reveal a specific interaction between SRAP and SRA. We determined the crystal structure of the carboxy-terminal domain of human SRAP and found that it does not have the postulated RRM (RNA recognition motif). The structure is a five-helix bundle that is distinct from known RNA-binding motifs and instead is similar to the carboxy-terminal domain of the yeast spliceosome protein PRP18, which stabilizes specific protein-protein interactions within a multisubunit mRNA splicing complex. SRA binding experiments with this domain gave negative results. Transcriptional regulation by SRA/SRAP was examined with siRNA knockdown. Effects on both specific estrogen-responsive genes and genes identified by RNA-seq as candidates for regulation were examined in MCF-7 cells. Only a small effect (~20% change) on one gene resulting from depletion of SRA/SRAP could be confirmed. We conclude that the current model for SRAP function must be reevaluated; we suggest that SRAP may function in a different context to stabilize specific intermolecular interactions in the nucleus.


    Organizational Affiliation

    BioFrontiers Institute, University of Colorado, Boulder, CO 80309, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Steroid receptor RNA activator 1
A, B
111Homo sapiensMutation(s): 0 
Gene Names: SRA1
Find proteins for Q9HD15 (Homo sapiens)
Go to Gene View: SRA1
Go to UniProtKB:  Q9HD15
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.807 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.245 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 85.901α = 90.00
b = 85.901β = 90.00
c = 100.408γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
ADSCdata collection
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-05
    Type: Initial release
  • Version 1.1: 2014-10-08
    Type: Database references