3OAK

Crystal structure of a Spn1 (Iws1)-Spt6 complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 

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This is version 1.2 of the entry. See complete history. 


Literature

Structure and biological importance of the spn1-spt6 interaction, and its regulatory role in nucleosome binding.

McDonald, S.M., Close, D., Xin, H., Formosa, T., Hill, C.P.

(2010) Mol Cell 40: 725-735

  • DOI: 10.1016/j.molcel.2010.11.014
  • Primary Citation of Related Structures:  
    3O8Z, 3OAK

  • PubMed Abstract: 

    • Eukaryotic transcription and mRNA processing depend upon the coordinated interactions of many proteins, including Spn1 and Spt6, which are conserved across eukaryotes, are essential for viability, and associate with each other in some of their biological ...

    Eukaryotic transcription and mRNA processing depend upon the coordinated interactions of many proteins, including Spn1 and Spt6, which are conserved across eukaryotes, are essential for viability, and associate with each other in some of their biologically important contexts. Here we report crystal structures of the Spn1 core alone and in complex with the binding determinant of Spt6. Mutating interface residues greatly diminishes binding in vitro and causes strong phenotypes in vivo, including a defect in maintaining repressive chromatin. Overexpression of Spn1 partially suppresses the defects caused by an spt6 mutation affecting the Spn1 interface, indicating that the Spn1-Spt6 interaction is important for managing chromatin. Spt6 binds nucleosomes directly in vitro, and this interaction is blocked by Spn1, providing further mechanistic insight into the function of the interaction. These data thereby reveal the structural and biochemical bases of molecular interactions that function in the maintenance of chromatin structure.

    Organizational Affiliation: 

    Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112-5650, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transcription factor IWS1 A, B151Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: IWS1, SPN1, YPR133C
Find proteins for Q06505 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q06505 
Go to UniProtKB:  Q06505
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Transcription elongation factor SPT6 C, D31Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SPT6, CRE2, SSN20, YGR116W, G6169
Find proteins for P23615 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P23615 
Go to UniProtKB:  P23615
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.858α = 90
b = 68.697β = 90
c = 73.966γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-11-16
    Changes: Atomic model