3PSI

Crystal Structure of the Spt6 core domain from Saccharomyces cerevisiae, Form Spt6(239-1451)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.265 
  • R-Value Observed: 0.269 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of the S. cerevisiae Spt6 core and C-terminal tandem SH2 domain.

Close, D.Johnson, S.J.Sdano, M.A.McDonald, S.M.Robinson, H.Formosa, T.Hill, C.P.

(2011) J Mol Biol 408: 697-713

  • DOI: 10.1016/j.jmb.2011.03.002
  • Primary Citation of Related Structures:  
    3PSF, 3PSI, 3PSJ, 3PSK

  • PubMed Abstract: 
  • The conserved and essential eukaryotic protein Spt6 functions in transcription elongation, chromatin maintenance, and RNA processing. Spt6 has three characterized functions. It is a histone chaperone capable of reassembling nucleosomes, a central com ...

    The conserved and essential eukaryotic protein Spt6 functions in transcription elongation, chromatin maintenance, and RNA processing. Spt6 has three characterized functions. It is a histone chaperone capable of reassembling nucleosomes, a central component of transcription elongation complexes, and is required for recruitment of RNA processing factors to elongating RNA polymerase II (RNAPII). Here, we report multiple crystal structures of the 168-kDa Spt6 protein from Saccharomyces cerevisiae that together represent essentially all of the ordered sequence. Our two structures of the ∼900-residue core region reveal a series of putative nucleic acid and protein-protein interaction domains that fold into an elongated form that resembles the bacterial protein Tex. The similarity to a bacterial transcription factor suggests that the core domain performs nucleosome-independent activities, and as with Tex, we find that Spt6 binds DNA. Unlike Tex, however, the Spt6 S1 domain does not contribute to this activity. Crystal structures of the Spt6 C-terminal region reveal a tandem SH2 domain structure composed of two closely associated SH2 folds. One of these SH2 folds is cryptic, while the other shares striking structural similarity with metazoan SH2 domains and possesses structural features associated with the ability to bind phosphorylated substrates including phosphotyrosine. Binding studies with phosphopeptides that mimic the RNAPII C-terminal domain revealed affinities typical of other RNAPII C-terminal domain-binding proteins but did not indicate a specific interaction. Overall, these findings provide a structural foundation for understanding how Spt6 encodes several distinct functions within a single polypeptide chain.


    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transcription elongation factor SPT6A1219Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: CRE2G6169SPT6SSN20YGR116W
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: 3.30 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.265 
  • R-Value Observed: 0.269 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.747α = 90
b = 118.747β = 90
c = 214.408γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-08-03
    Changes: Database references