5UN7

Structure of the human POT1-TPP1 telomeric complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1038/ncomms14928

  • 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 leu ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protection of telomeres protein 1
A
308Homo 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
86Homo 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 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
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: 0.222 
  • R-Value Work: 0.182 
  • Space Group: P 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 99.530α = 90.00
b = 99.530β = 90.00
c = 122.140γ = 90.00
Software Package:
Software NamePurpose
SHELXDphasing
XSCALEdata scaling
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer InstituteUnited StatesR01CA201312
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM088332-03
National Institutes of Health/National Cancer InstituteUnited StatesP30 CA10815

Revision History 

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-04-26
    Type: Database references
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence