7UIC

Mediator-PIC Early (Tail A)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of a transcription pre-initiation complex on a divergent promoter.

Gorbea Colon, J.J.Palao 3rd, L.Chen, S.F.Kim, H.J.Snyder, L.Chang, Y.W.Tsai, K.L.Murakami, K.

(2023) Mol Cell 83: 574

  • DOI: https://doi.org/10.1016/j.molcel.2023.01.011
  • Primary Citation of Related Structures:  
    7UI9, 7UIC, 7UIF, 7UIG, 7UIK, 7UIL, 7UIO

  • PubMed Abstract: 

    Most eukaryotic promoter regions are divergently transcribed. As the RNA polymerase II pre-initiation complex (PIC) is intrinsically asymmetric and responsible for transcription in a single direction, it is unknown how divergent transcription arises. Here, the Saccharomyces cerevisiae Mediator complexed with a PIC (Med-PIC) was assembled on a divergent promoter and analyzed by cryoelectron microscopy. The structure reveals two distinct Med-PICs forming a dimer through the Mediator tail module, induced by a homodimeric activator protein localized near the dimerization interface. The tail dimer is associated with ∼80-bp upstream DNA, such that two flanking core promoter regions are positioned and oriented in a suitable form for PIC assembly in opposite directions. Also, cryoelectron tomography visualized the progress of the PIC assembly on the two core promoter regions, providing direct evidence for the role of the Med-PIC dimer in divergent transcription.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Biochemistry and Molecular Biophysics Graduate Group, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of RNA polymerase II transcription subunit 2A [auth b]431Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for Q12124 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Go to UniProtKB:  Q12124
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UniProt GroupQ12124
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of RNA polymerase II transcription subunit 3B [auth c]397Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P40356 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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UniProt GroupP40356
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of RNA polymerase II transcription subunit 5C [auth e]1,132Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P53114 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of RNA polymerase II transcription subunit 14D [auth n]1,082Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P19263 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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UniProt GroupP19263
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of RNA polymerase II transcription subunit 15E [auth o]1,081Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P19659 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Mediator of RNA polymerase II transcription subunit 16F [auth p]974Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P32259 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01-GM123233-01

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-15
    Type: Initial release
  • Version 1.1: 2023-03-08
    Changes: Database references
  • Version 1.2: 2024-06-12
    Changes: Data collection