3NFQ

Crystal structure of the conserved central domain of yeast Spn1/Iws1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.207 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The Transcription Factor Spn1 Regulates Gene Expression via a Highly Conserved Novel Structural Motif.

Pujari, V.Radebaugh, C.A.Chodaparambil, J.V.Muthurajan, U.M.Almeida, A.R.Fischbeck, J.A.Luger, K.Stargell, L.A.

(2010) J Mol Biol 404: 1-15

  • DOI: 10.1016/j.jmb.2010.09.040
  • Primary Citation of Related Structures:  
    3NFQ

  • PubMed Abstract: 
  • Spn1/Iws1 plays essential roles in the regulation of gene expression by RNA polymerase II (RNAPII), and it is highly conserved in organisms ranging from yeast to humans. Spn1 physically and/or genetically interacts with RNAPII, TBP (TATA-binding protein) ...

    Spn1/Iws1 plays essential roles in the regulation of gene expression by RNA polymerase II (RNAPII), and it is highly conserved in organisms ranging from yeast to humans. Spn1 physically and/or genetically interacts with RNAPII, TBP (TATA-binding protein), TFIIS (transcription factor IIS), and a number of chromatin remodeling factors (Swi/Snf and Spt6). The central domain of Spn1 (residues 141-305 out of 410) is necessary and sufficient for performing the essential functions of SPN1 in yeast cells. Here, we report the high-resolution (1.85 Å) crystal structure of the conserved central domain of Saccharomyces cerevisiae Spn1. The central domain is composed of eight α-helices in a right-handed superhelical arrangement and exhibits structural similarity to domain I of TFIIS. A unique structural feature of Spn1 is a highly conserved loop, which defines one side of a pronounced cavity. The loop and the other residues forming the cavity are highly conserved at the amino acid level among all Spn1 family members, suggesting that this is a signature motif for Spn1 orthologs. The locations and the molecular characterization of temperature-sensitive mutations in Spn1 indicate that the cavity is a key attribute of Spn1 that is critical for its regulatory functions during RNAPII-mediated transcriptional activity.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523-1870, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transcription factor IWS1 AB170Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: IWS1SPN1YPR133C
Find proteins for Q06505 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q06505 
Go to UniProtKB:  Q06505
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A,BL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.6α = 90
b = 67.8β = 90
c = 76γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
SOLVEphasing
REFMACrefinement
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance