5H65

Crystal structure of human POT1 and TPP1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.0 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: 10.1038/ncomms14929

  • 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 t ...

    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.,Department of Pathology, Yale School of Medicine, New Haven, Connecticut 05620, USA.,Department of Laboratory Medicine, Yale School of Medicine, New Haven, Connecticut 05620, USA.,Department of Pathology, University of Michigan School of Medicine, Ann Arbor, Michigan 48109, USA.,Department of Medicine, Yale School of Medicine, New Haven, Connecticut 05620, USA.,Department of Molecular Biophysics and Biochemistry, Yale School of Medicine, New Haven, Connecticut 05620, USA.,Shanghai Research Center, Chinese Academy of Sciences, Shanghai 200031, China.,National Laboratory for Physical Science at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protection of telomeres protein 1
A
294Homo sapiensMutation(s): 0 
Gene Names: POT1
Find proteins for Q9NUX5 (Homo sapiens)
Go to Gene View: POT1
Go to UniProtKB:  Q9NUX5
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Adrenocortical dysplasia protein homolog
B
53Homo sapiensMutation(s): 0 
Gene Names: ACD (PIP1, PTOP, TINT1, TPP1)
Find proteins for Q96AP0 (Homo sapiens)
Go to Gene View: ACD
Go to UniProtKB:  Q96AP0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 49.231α = 90.00
b = 87.824β = 90.00
c = 87.120γ = 90.00
Software Package:
Software NamePurpose
HKLdata scaling
PHENIXphasing
HKL-3000data scaling
HKL-3000data collection
HKL-3000data processing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-11-10 
  • Released Date: 2017-05-31 
  • Deposition Author(s): Chen, C., Wu, J., Lei, M.

Revision History 

  • Version 1.0: 2017-05-31
    Type: Initial release