2HZS

Structure of the Mediator head submodule Med8C/18/20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.236 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure and TBP binding of the Mediator head subcomplex Med8-Med18-Med20.

Lariviere, L.Geiger, S.Hoeppner, S.Rother, S.Strasser, K.Cramer, P.

(2006) Nat Struct Mol Biol 13: 895-901

  • DOI: 10.1038/nsmb1143
  • Primary Citation of Related Structures:  
    2HZM, 2HZS

  • PubMed Abstract: 
  • The Mediator head module stimulates basal RNA polymerase II (Pol II) transcription and enables transcriptional regulation. Here we show that the head subunits Med8, Med18 and Med20 form a subcomplex (Med8/18/20) with two submodules. The highly conserved N-terminal domain of Med8 forms one submodule that binds the TATA box-binding protein (TBP) in vitro and is essential in vivo ...

    The Mediator head module stimulates basal RNA polymerase II (Pol II) transcription and enables transcriptional regulation. Here we show that the head subunits Med8, Med18 and Med20 form a subcomplex (Med8/18/20) with two submodules. The highly conserved N-terminal domain of Med8 forms one submodule that binds the TATA box-binding protein (TBP) in vitro and is essential in vivo. The second submodule consists of the C-terminal region of Med8 (Med8C), Med18 and Med20. X-ray analysis of this submodule reveals that Med18 and Med20 form related beta-barrel folds. A conserved putative protein-interaction face on the Med8C/18/20 submodule includes sites altered by srb mutations, which counteract defects resulting from Pol II truncation. Our results and published data support a positive role of the Med8/18/20 subcomplex in initiation-complex formation and suggest that the Mediator head contains a multipartite TBP-binding site that can be modulated by transcriptional activators.


    Organizational Affiliation

    Gene Center Munich, Department of Chemistry and Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Str. 25, 81377 Munich, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RNA polymerase II mediator complex subunit 20A, C, E, G209Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SRB2HRS2MED20
UniProt
Find proteins for P34162 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P34162 
Go to UniProtKB:  P34162
Entity Groups  
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UniProt GroupP34162
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
RNA polymerase II mediator complex subunit 18B, D, F, H306Saccharomyces cerevisiaeMutation(s): 1 
Gene Names: SRB5MED18
UniProt
Find proteins for P32585 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32585 
Go to UniProtKB:  P32585
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UniProt GroupP32585
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
RNA polymerase II mediator complex subunit 8I, J, K, L27Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MED8
UniProt
Find proteins for P38304 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P38304 
Go to UniProtKB:  P38304
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP38304
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.236 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.365α = 90
b = 115.762β = 98.49
c = 129.159γ = 90
Software Package:
Software NamePurpose
PHASERphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-12
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references