5H65

Crystal structure of human POT1 and TPP1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into POT1-TPP1 interaction and POT1 C-terminal mutations in human cancer.

Chen, C.Gu, P.Wu, J.Chen, X.Niu, S.Sun, H.Wu, L.Li, N.Peng, J.Shi, S.Fan, C.Huang, M.Wong, C.C.Gong, Q.Kumar-Sinha, C.Zhang, R.Pusztai, L.Rai, R.Chang, S.Lei, M.

(2017) Nat Commun 8: 14929-14929

  • DOI: https://doi.org/10.1038/ncomms14929
  • Primary Citation of Related Structures:  
    5H65

  • PubMed Abstract: 

    Mammalian shelterin proteins POT1 and TPP1 form a stable heterodimer that protects chromosome ends and regulates telomerase-mediated telomere extension. However, how POT1 interacts with TPP1 remains unknown. Here we present the crystal structure of the C-terminal portion of human POT1 (POT1C) complexed with the POT1-binding motif of TPP1. The structure shows that POT1C contains two domains, a third OB fold and a Holliday junction resolvase-like domain. Both domains are essential for binding to TPP1. Notably, unlike the heart-shaped structure of ciliated protozoan Oxytricha nova TEBPα-β complex, POT1-TPP1 adopts an elongated V-shaped conformation. In addition, we identify several missense mutations in human cancers that disrupt the POT1C-TPP1 interaction, resulting in POT1 instability. POT1C mutants that bind TPP1 localize to telomeres but fail to repress a DNA damage response and inappropriate repair by A-NHEJ. Our results reveal that POT1 C terminus is essential to prevent initiation of genome instability permissive for tumorigenesis.


  • Organizational Affiliation

    National Center for Protein Science Shanghai, State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 333 Haike Road, Shanghai 201210, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protection of telomeres protein 1294Homo sapiensMutation(s): 0 
Gene Names: POT1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NUX5 (Homo sapiens)
Explore Q9NUX5 
Go to UniProtKB:  Q9NUX5
PHAROS:  Q9NUX5
GTEx:  ENSG00000128513 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NUX5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Adrenocortical dysplasia protein homolog53Homo sapiensMutation(s): 0 
Gene Names: ACDPIP1PTOPTINT1TPP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q96AP0 (Homo sapiens)
Explore Q96AP0 
Go to UniProtKB:  Q96AP0
PHAROS:  Q96AP0
GTEx:  ENSG00000102977 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96AP0
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.231α = 90
b = 87.824β = 90
c = 87.12γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
PDB_EXTRACTdata extraction
HKL-3000data processing
HKL-3000data scaling
PHENIXphasing
PHENIXrefinement
HKLdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-31
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Data collection, Database references