1H6O

Dimerisation domain from human TRF1

• PDB DOI:  https://doi.org/10.2210/pdb1H6O/pdb

• Classification: TELOMERE BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2001-06-20 Released: 2001-09-05 
• Deposition Author(s): Fairall, L., Chapman, L., Rhodes, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.303 
• R-Value Work: 0.250 
• R-Value Observed: 0.250 

Literature

Structure of the TRFH dimerization domain of the human telomeric proteins TRF1 and TRF2.

Fairall, L., Chapman, L., Moss, H., de Lange, T., Rhodes, D.

(2001) Mol Cell 8: 351-361

• PubMed: 11545737 
• DOI: https://doi.org/10.1016/s1097-2765(01)00321-5
• Primary Citation of Related Structures:  
  1H6O, 1H6P


• PubMed Abstract: 
  

TRF1 and TRF2 are key components of vertebrate telomeres. They bind to double-stranded telomeric DNA as homodimers. Dimerization involves the TRF homology (TRFH) domain, which also mediates interactions with other telomeric proteins. The crystal structures of the dimerization domains from human TRF1 and TRF2 were determined at 2.9 and 2.2 A resolution, respectively. Despite a modest sequence identity, the two TRFH domains have the same entirely alpha-helical architecture, resembling a twisted horseshoe. The dimerization interfaces feature unique interactions that prevent heterodimerization. Mutational analysis of TRF1 corroborates the structural data and underscores the importance of the TRFH domain in dimerization, DNA binding, and telomere localization. A possible structural homology between the TRFH domain of fission yeast telomeric protein Taz1 with those of the vertebrate TRFs is suggested.

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Related Citations: 

• A Human Telomeric Protein
  Chong, L., Van Steensel, B., Broccoli, D., Erdjument-Bromage, H., Hannish, J., Tempst, P., de Lange, T.
  (1995) Science 270: 1663

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Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Hills Road, CB2 2QH, Cambridge, United Kingdom.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 23.33 kDa 
• Atom Count: 1,475 
• Modelled Residue Count: 195 
• Deposited Residue Count: 204 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TELOMERIC REPEAT BINDING FACTOR 1	A	204	Homo sapiens	Mutation(s): 0  Gene Names: TERF1, PIN2, TRBF1, TRF, TRF1
UniProt & NIH Common Fund Data Resources
Find proteins for P54274 (Homo sapiens) Explore P54274  Go to UniProtKB:  P54274
PHAROS:  P54274

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.303 
• R-Value Work: 0.250 
• R-Value Observed: 0.250 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.39	α = 90
b = 85.39	β = 90
c = 91.63	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling
CCP4	phasing
SOLVE	phasing
SHARP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-09-05 
Deposition Author(s): Fairall, L., Chapman, L., Rhodes, D.

Revision History  

• Version 1.0: 2001-09-05
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-06-13
  Changes: Data collection, Database references
• Version 1.4: 2019-10-09
  Changes: Data collection, Database references, Other