8OX0

Structure of apo telomeric nucleosome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history


Literature

Structural basis of telomeric nucleosome recognition by shelterin factor TRF1.

Hu, H.van Roon, A.M.Ghanim, G.E.Ahsan, B.Oluwole, A.O.Peak-Chew, S.Y.Robinson, C.V.Nguyen, T.H.D.

(2023) Sci Adv 9: eadi4148-eadi4148

  • DOI: https://doi.org/10.1126/sciadv.adi4148
  • Primary Citation of Related Structures:  
    8OX0, 8OX1

  • PubMed Abstract: 

    Shelterin and nucleosomes are the key players that organize mammalian chromosome ends into the protective telomere caps. However, how they interact with each other at telomeres remains unknown. We report cryo-electron microscopy structures of a human telomeric nucleosome both unbound and bound to the shelterin factor TRF1. Our structures reveal that TRF1 binds unwrapped nucleosomal DNA ends by engaging both the nucleosomal DNA and the histone octamer. Unexpectedly, TRF1 binding shifts the register of the nucleosomal DNA by 1 bp. We discovered that phosphorylation of the TRF1 C terminus and a noncanomical DNA binding surface on TRF1 are critical for its association with telomeric nucleosomes. These insights into shelterin-chromatin interactions have crucial implications for understanding telomeric chromatin organization and other roles of shelterin at telomeres including replication and transcription.


  • Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3.1
A, E
140Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P68431 (Homo sapiens)
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PHAROS:  P68431
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UniProt GroupP68431
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H4
B, F
107Homo sapiensMutation(s): 0 
Gene Names: 
UniProt & NIH Common Fund Data Resources
Find proteins for P62805 (Homo sapiens)
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PHAROS:  P62805
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UniProt GroupP62805
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2A type 1-C
C, G
134Homo sapiensMutation(s): 0 
Gene Names: H2AC6H2AFLHIST1H2AC
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Find proteins for Q93077 (Homo sapiens)
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PHAROS:  Q93077
GTEx:  ENSG00000180573 
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UniProt GroupQ93077
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2B type 1-C/E/F/G/I
D, H
130Homo sapiensMutation(s): 0 
Gene Names: 
UniProt & NIH Common Fund Data Resources
Find proteins for P62807 (Homo sapiens)
Explore P62807 
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PHAROS:  P62807
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UniProt GroupP62807
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Entity ID: 5
MoleculeChains LengthOrganismImage
Telomeric DNA G strandI [auth J]145Homo sapiens
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Entity ID: 6
MoleculeChains LengthOrganismImage
Telomeric DNA C strandJ [auth I]145Homo sapiens
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTREFMAC5.8.0256
MODEL REFINEMENTPHENIX1.20

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
UK Research and Innovation (UKRI)United KingdomMC_UP_1201/19
European Molecular Biology Organization (EMBO)European Union--
Jane Coffin Childs (JCC) FundUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-30
    Type: Initial release
  • Version 1.1: 2023-09-06
    Changes: Database references