5UN7 | pdb_00005un7

Structure of the human POT1-TPP1 telomeric complex

  • Classification: PROTEIN BINDING
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2017-01-30 Released: 2017-04-12 
  • Deposition Author(s): Rice, C., Doukov, T., Skordalakes, E.
  • Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 
    0.222 (Depositor), 0.224 (DCC) 
  • R-Value Work: 
    0.182 (Depositor), 0.186 (DCC) 
  • R-Value Observed: 
    0.184 (Depositor) 

wwPDB Validation 3D Report Full Report

Validation slider image for 5UN7

This is version 1.4 of the entry. See complete history. 

Literature

Structural and functional analysis of the human POT1-TPP1 telomeric complex.

Rice, C., Shastrula, P.K., Kossenkov, A.V., Hills, R., Baird, D.M., Showe, L.C., Doukov, T., Janicki, S., Skordalakes, E.

(2017) Nat Commun 8: 14928-14928

  • DOI: https://doi.org/10.1038/ncomms14928
  • Primary Citation Related Structures: 
    5UN7

  • PubMed Abstract: 

    POT1 and TPP1 are part of the shelterin complex and are essential for telomere length regulation and maintenance. Naturally occurring mutations of the telomeric POT1-TPP1 complex are implicated in familial glioma, melanoma and chronic lymphocytic leukaemia. Here we report the atomic structure of the interacting portion of the human telomeric POT1-TPP1 complex and suggest how several of these mutations contribute to malignant cancer. The POT1 C-terminus (POT1C) forms a bilobal structure consisting of an OB-fold and a holiday junction resolvase domain. TPP1 consists of several loops and helices involved in extensive interactions with POT1C. Biochemical data shows that several of the cancer-associated mutations, partially disrupt the POT1-TPP1 complex, which affects its ability to bind telomeric DNA efficiently. A defective POT1-TPP1 complex leads to longer and fragile telomeres, which in turn promotes genomic instability and cancer.

    • Organizational Affiliation: 
    • The Wistar Institute, 3601 Spruce St, Philadelphia, Pennsylvania 19104, USA.

Macromolecule Content 

  • Total Structure Weight: 44.16 kDa 
  • Atom Count: 3,374 
  • Modeled Residue Count: 363 
  • Deposited Residue Count: 394 
  • Unique protein chains: 2

Macromolecules

Find similar proteins by:
|  3D Structure
Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Protection of telomeres protein 1308Homo 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:
|  3D Structure
Entity ID: 2
MoleculeChains  Sequence LengthOrganismDetailsImage
Adrenocortical dysplasia protein homolog86Homo sapiensMutation(s): 0 
Gene Names: ACD, PIP1, PTOP, TINT1, TPP1
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

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free:  0.222 (Depositor), 0.224 (DCC) 
  • R-Value Work:  0.182 (Depositor), 0.186 (DCC) 
  • R-Value Observed: 0.184 (Depositor) 
Space Group: P 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.53α = 90
b = 99.53β = 90
c = 122.14γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
SHELXDphasing

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History 

& Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR01CA201312
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM088332-03
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP30 CA10815

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-04-26
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence
  • Version 1.3: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.4: 2024-03-06
    Changes: Data collection, Database references, Derived calculations