1XJV

Crystal structure of human POT1 bound to telomeric single-stranded DNA (TTAGGGTTAG)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.232 

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This is version 1.2 of the entry. See complete history. 


Literature

Structure of human POT1 bound to telomeric single-stranded DNA provides a model for chromosome end-protection

Lei, M., Podell, E.R., Cech, T.R.

(2004) Nat Struct Mol Biol 11: 1223-1229

  • DOI: 10.1038/nsmb867
  • Primary Citation of Related Structures:  
    1XJV

  • PubMed Abstract: 

    • The POT1 (protection of telomeres 1) protein binds the single-stranded overhang at the ends of chromosomes in diverse eukaryotes. It is essential for chromosome end-protection in the fission yeast Schizosaccharomyces pombe, and it is involved in regulation of telomere length in human cells ...

    The POT1 (protection of telomeres 1) protein binds the single-stranded overhang at the ends of chromosomes in diverse eukaryotes. It is essential for chromosome end-protection in the fission yeast Schizosaccharomyces pombe, and it is involved in regulation of telomere length in human cells. Here, we report the crystal structure at a resolution of 1.73 A of the N-terminal half of human POT1 (hPOT1) protein bound to a telomeric single-stranded DNA (ssDNA) decamer, TTAGGGTTAG, the minimum tight-binding sequence indicated by in vitro binding assays. The structure reveals that hPOT1 contains two oligonucleotide/ oligosaccharide-binding (OB) folds; the N-terminal OB fold binds the first six nucleotides, resembling the structure of the S. pombe Pot1pN-ssDNA complex, whereas the second OB fold binds and protects the 3' end of the ssDNA. These results provide an atomic-resolution model for chromosome end-capping.

    Organizational Affiliation: 

    Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA.



Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protection of telomeres 1B [auth A]294Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NUX5
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
hT10 d(TTAGGGTTAG)A [auth B]10N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.73 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.232 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.026α = 90
b = 103.243β = 90
c = 71.664γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
CNSrefinement
HKL-2000data reduction
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-12-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance