4J19

Structure of a novel telomere repeat binding protein bound to DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 

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

  • 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. ...

    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: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Homeobox-containing protein 1
A, B
113Homo sapiensMutation(s): 0 
Gene Names: HMBOX1 (HOT1, TAH1)
Find proteins for Q6NT76 (Homo sapiens)
Go to Gene View: HMBOX1
Go to UniProtKB:  Q6NT76
Entity ID: 2
MoleculeChainsLengthOrganism
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
Entity ID: 3
MoleculeChainsLengthOrganism
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 SDF File 
Download CCD File 
C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 111.433α = 90.00
b = 116.490β = 90.00
c = 75.670γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXphasing
XDSdata scaling
PHENIXmodel building
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

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