4J19

Structure of a novel telomere repeat binding protein bound to DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

wwPDB Validation   3D Report Full Report


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


Literature

HOT1 is a mammalian direct telomere repeat-binding protein contributing to telomerase recruitment.

Kappei, D., Butter, F., Benda, C., Scheibe, M., Draskovic, I., Stevense, M., Novo, C.L., Basquin, C., Araki, M., Araki, K., Krastev, D.B., Kittler, R., Jessberger, R., Londono-Vallejo, J.A., Mann, M., Buchholz, F.

(2013) EMBO J 32: 1681-1701

  • DOI: 10.1038/emboj.2013.105
  • Primary Citation of Related Structures:  
    4J19

  • PubMed Abstract: 

    • Telomeres are repetitive DNA structures that, together with the shelterin and the CST complex, protect the ends of chromosomes. Telomere shortening is mitigated in stem and cancer cells through the de novo addition of telomeric repeats by telomerase. Telomere elongation requires the delivery of the telomerase complex to telomeres through a not yet fully understood mechanism ...

    Telomeres are repetitive DNA structures that, together with the shelterin and the CST complex, protect the ends of chromosomes. Telomere shortening is mitigated in stem and cancer cells through the de novo addition of telomeric repeats by telomerase. Telomere elongation requires the delivery of the telomerase complex to telomeres through a not yet fully understood mechanism. Factors promoting telomerase-telomere interaction are expected to directly bind telomeres and physically interact with the telomerase complex. In search for such a factor we carried out a SILAC-based DNA-protein interaction screen and identified HMBOX1, hereafter referred to as homeobox telomere-binding protein 1 (HOT1). HOT1 directly and specifically binds double-stranded telomere repeats, with the in vivo association correlating with binding to actively processed telomeres. Depletion and overexpression experiments classify HOT1 as a positive regulator of telomere length. Furthermore, immunoprecipitation and cell fractionation analyses show that HOT1 associates with the active telomerase complex and promotes chromatin association of telomerase. Collectively, these findings suggest that HOT1 supports telomerase-dependent telomere elongation.

    Organizational Affiliation: 

    Medical Systems Biology, Faculty of Medicine Carl Gustav Carus, University Cancer Center, Dresden University of Technology, 01307 Dresden, Germany.



Macromolecules

Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Homeobox-containing protein 1A, B113Homo sapiensMutation(s): 0 
Gene Names: HMBOX1, HOT1, TAH1
Find proteins for Q6NT76 (Homo sapiens)
Explore Q6NT76 
Go to UniProtKB:  Q6NT76
NIH Common Fund Data Resources
PHAROS:  Q6NT76
GTEx:  ENSG00000147421
Protein Feature View
Expand
  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*CP*TP*GP*TP*TP*AP*GP*GP*GP*TP*TP*AP*GP*GP*GP*TP*TP*AP*G)-3')C19N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
      • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*TP*CP*TP*AP*AP*CP*CP*CP*TP*AP*AP*CP*CP*CP*TP*AP*AP*CP*A)-3')D19N/A
      Small Molecules
      Ligands 1 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      CL
      Query on CL
      Download Ideal Coordinates CCD File 
      		 E [auth C]CHLORIDE ION
      Cl
      VEXZGXHMUGYJMC-UHFFFAOYSA-M      		 Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.90 Å
      • R-Value Free: 0.221 
      • R-Value Work: 0.172 
      • R-Value Observed: 0.174 
      • Space Group: C 2 2 21
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 111.433α = 90
      b = 116.49β = 90
      c = 75.67γ = 90
      Software Package:
      Software NamePurpose
      PHENIXmodel building
      PHENIXrefinement
      XDSdata reduction
      XDSdata scaling
      PHENIXphasing

      Structure Validation

      View Full Validation Report


      View more in-depth experimental data

      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2013-05-29
        Type: Initial release
      • Version 1.1: 2013-07-10
        Changes: Database references
      • Version 1.2: 2017-11-15
        Changes: Refinement description