7C5D

Crystal structure of TRF2 TRFH domain in complex with a MCPH1 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Microcephalin 1/BRIT1-TRF2 interaction promotes telomere replication and repair, linking telomere dysfunction to primary microcephaly.

Cicconi, A.Rai, R.Xiong, X.Broton, C.Al-Hiyasat, A.Hu, C.Dong, S.Sun, W.Garbarino, J.Bindra, R.S.Schildkraut, C.Chen, Y.Chang, S.

(2020) Nat Commun 11: 5861-5861

  • DOI: https://doi.org/10.1038/s41467-020-19674-0
  • Primary Citation of Related Structures:  
    7C5D

  • PubMed Abstract: 

    Telomeres protect chromosome ends from inappropriately activating the DNA damage and repair responses. Primary microcephaly is a key clinical feature of several human telomere disorder syndromes, but how microcephaly is linked to dysfunctional telomeres is not known. Here, we show that the microcephalin 1/BRCT-repeats inhibitor of hTERT (MCPH1/BRIT1) protein, mutated in primary microcephaly, specifically interacts with the TRFH domain of the telomere binding protein TRF2. The crystal structure of the MCPH1-TRF2 complex reveals that this interaction is mediated by the MCPH1 330 YRLSP 334 motif. TRF2-dependent recruitment of MCPH1 promotes localization of DNA damage factors and homology directed repair of dysfunctional telomeres lacking POT1-TPP1. Additionally, MCPH1 is involved in the replication stress response, promoting telomere replication fork progression and restart of stalled telomere replication forks. Our work uncovers a previously unrecognized role for MCPH1 in promoting telomere replication, providing evidence that telomere replication defects may contribute to the onset of microcephaly.


  • Organizational Affiliation

    Department of Laboratory Medicine, Yale University School of Medicine, 330 Cedar St., New Haven, CT, 06520, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Telomeric repeat-binding factor 2
A, B
204Homo sapiensMutation(s): 0 
Gene Names: TRF2
UniProt & NIH Common Fund Data Resources
Find proteins for Q15554 (Homo sapiens)
Explore Q15554 
Go to UniProtKB:  Q15554
PHAROS:  Q15554
GTEx:  ENSG00000132604 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15554
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Microcephalin
C, D
21Homo sapiensMutation(s): 0 
Gene Names: MCPH1
UniProt & NIH Common Fund Data Resources
Find proteins for Q8NEM0 (Homo sapiens)
Explore Q8NEM0 
Go to UniProtKB:  Q8NEM0
PHAROS:  Q8NEM0
GTEx:  ENSG00000147316 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NEM0
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.737α = 90
b = 74.941β = 90
c = 98.418γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data scaling
PHASERphasing
PDB_EXTRACTdata extraction
HKL-3000data reduction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31970576

Revision History  (Full details and data files)

  • Version 1.0: 2020-10-21
    Type: Initial release
  • Version 1.1: 2020-12-02
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Data collection, Database references, Refinement description