8SH0

Structure of human POT1 DNA binding domain bound to a 5'-phosphorylated junction of a telomeric DNA hairpin with a 3'-overhang

  • Classification: DNA BINDING PROTEIN/DNA
  • Organism(s): Homo sapiens
  • Expression System: Trichoplusia ni
  • Mutation(s): No 

  • Deposited: 2023-04-13 Released: 2023-08-30 
  • Deposition Author(s): Nandakumar, J., Tesmer, V.M.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD), American Cancer Society

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

Starting Model: experimental
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This is version 1.0 of the entry. See complete history


Literature

Human POT1 protects the telomeric ds-ss DNA junction by capping the 5' end of the chromosome.

Tesmer, V.M.Brenner, K.A.Nandakumar, J.

(2023) Science 381: 771-778

  • DOI: https://doi.org/10.1126/science.adi2436
  • Primary Citation of Related Structures:  
    8SH0, 8SH1

  • PubMed Abstract: 

    Protection of telomeres 1 (POT1) is the 3' single-stranded overhang-binding telomeric protein that prevents an ataxia telangiectasia and Rad3-related (ATR) DNA damage response (DDR) at chromosome ends. What precludes the DDR machinery from accessing the telomeric double-stranded-single-stranded junction is unknown. We demonstrate that human POT1 binds this junction by recognizing the phosphorylated 5' end of the chromosome. High-resolution crystallographic structures reveal that the junction is capped by POT1 through a "POT-hole" surface, the mutation of which compromises junction protection in vitro and telomeric 5'-end definition and DDR suppression in human cells. Whereas both mouse POT1 paralogs bind the single-stranded overhang, POT1a, not POT1b, contains a POT-hole and binds the junction, which explains POT1a's sufficiency for end protection. Our study shifts the paradigm for DDR suppression at telomeres by highlighting the importance of protecting the double-stranded-single-stranded junction.


  • Organizational Affiliation

    Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protection of telomeres protein 1300Homo 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

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(P*CP*CP*AP*GP*CP*AP*GP*GP*GP*GP*TP*TP*AP*GP*GP*GP*TP*TP*AP*G)-3')20Homo sapiens
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.23α = 90
b = 67.23β = 90
c = 143.373γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM120094
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM148276
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)United StatesR01HD108809
American Cancer SocietyUnited StatesRSG-17-037-01-DMC

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-30
    Type: Initial release