7NL0

Cryo-EM structure of the Lin28B nucleosome core particle


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Dissecting OCT4 defines the role of nucleosome binding in pluripotency.

Roberts, G.A.Ozkan, B.Gachulincova, I.O'Dwyer, M.R.Hall-Ponsele, E.Saxena, M.Robinson, P.J.Soufi, A.

(2021) Nat Cell Biol 23: 834-845

  • DOI: 10.1038/s41556-021-00727-5
  • Primary Citation of Related Structures:  
    7NL0

  • PubMed Abstract: 
  • Pioneer transcription factors such as OCT4 can target silent genes embedded in nucleosome-dense regions. How nucleosome interaction enables transcription factors to target chromatin and determine cell identity remains elusive. Here, we systematically dissect OCT4 to show that nucleosome binding is encoded within the DNA-binding domain and yet can be uncoupled from free-DNA binding ...

    Pioneer transcription factors such as OCT4 can target silent genes embedded in nucleosome-dense regions. How nucleosome interaction enables transcription factors to target chromatin and determine cell identity remains elusive. Here, we systematically dissect OCT4 to show that nucleosome binding is encoded within the DNA-binding domain and yet can be uncoupled from free-DNA binding. Furthermore, accelerating the binding kinetics of OCT4 to DNA enhances nucleosome binding. In cells, uncoupling nucleosome binding diminishes the ability of OCT4 to individually access closed chromatin, while more dynamic nucleosome binding results in expansive genome scanning within closed chromatin. However, both uncoupling and enhancing nucleosome binding are detrimental to inducing pluripotency from differentiated cells. Remarkably, stable interactions between OCT4 and nucleosomes are continuously required for maintaining the accessibility of pluripotency enhancers in stem cells. Our findings reveal how the affinity and residence time of OCT4-nucleosome complexes modulate chromatin accessibility during cell fate changes and maintenance.


    Organizational Affiliation

    Centre for Regenerative Medicine, Institute for Regeneration and Repair, Institute of Stem Cell Research, University of Edinburgh, Edinburgh, UK. Abdenour.Soufi@ed.ac.uk.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3.1A, E136Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P68431 (Homo sapiens)
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UniProt GroupP68431
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4B, F103Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P62805 (Homo sapiens)
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UniProt GroupP62805
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2A type 1-B/EC, G130Homo sapiensMutation(s): 0 
Gene Names: HIST1H2ABH2AFMHIST1H2AEH2AFAH2AC4H2AC8
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Find proteins for P04908 (Homo sapiens)
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UniProt GroupP04908
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2B type 1-JD, H126Homo sapiensMutation(s): 0 
Gene Names: HIST1H2BJH2BFRH2BC11
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Find proteins for P06899 (Homo sapiens)
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Entity ID: 5
MoleculeChainsLengthOrganismImage
DNA (131-MER)I 162Homo sapiens
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (131-MER)J 162Homo sapiens
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (MRC, United Kingdom)United KingdomMR/N024028/1
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/M0180404/1
Medical Research Council (MRC, United Kingdom)United KingdomMR/R008795/1
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/M010996/1
Wellcome TrustUnited Kingdom202679/Z/16/Z
Wellcome TrustUnited Kingdom206166/Z/17/Z

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-11
    Type: Initial release
  • Version 1.1: 2021-09-29
    Changes: Data collection, Database references