5XYF

Crystal structure of the human TIN2-TPP1-TRF2 telomeric complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.202 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural and functional analyses of the mammalian TIN2-TPP1-TRF2 telomeric complex.

Hu, C.Rai, R.Huang, C.Broton, C.Long, J.Xu, Y.Xue, J.Lei, M.Chang, S.Chen, Y.

(2017) Cell Res. 27: 1485-1502

  • DOI: 10.1038/cr.2017.144

  • PubMed Abstract: 
  • Telomeres are nucleoprotein complexes that play essential roles in protecting chromosome ends. Mammalian telomeres consist of repetitive DNA sequences bound by the shelterin complex. In this complex, the POT1-TPP1 heterodimer binds to single-stranded ...

    Telomeres are nucleoprotein complexes that play essential roles in protecting chromosome ends. Mammalian telomeres consist of repetitive DNA sequences bound by the shelterin complex. In this complex, the POT1-TPP1 heterodimer binds to single-stranded telomeric DNAs, while TRF1 and TRF2-RAP1 interact with double-stranded telomeric DNAs. TIN2, the linchpin of this complex, simultaneously interacts with TRF1, TRF2, and TPP1 to mediate the stable assembly of the shelterin complex. However, the molecular mechanism by which TIN2 interacts with these proteins to orchestrate telomere protection remains poorly understood. Here, we report the crystal structure of the N-terminal domain of TIN2 in complex with TIN2-binding motifs from TPP1 and TRF2, revealing how TIN2 interacts cooperatively with TPP1 and TRF2. Unexpectedly, TIN2 contains a telomeric repeat factor homology (TRFH)-like domain that functions as a protein-protein interaction platform. Structure-based mutagenesis analyses suggest that TIN2 plays an important role in maintaining the stable shelterin complex required for proper telomere end protection.


    Organizational Affiliation

    State Key Laboratory of Molecular Biology, National Center for Protein Science Shanghai, Shanghai Science Research Center, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences; University of Chinese Academy of Sciences, 333 Haike Road, Shanghai 201210, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TERF1-interacting nuclear factor 2
A
204Homo sapiensMutation(s): 0 
Gene Names: TINF2 (TIN2)
Find proteins for Q9BSI4 (Homo sapiens)
Go to Gene View: TINF2
Go to UniProtKB:  Q9BSI4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Telomeric repeat-binding factor 2
C
18Homo sapiensMutation(s): 0 
Gene Names: TERF2 (TRBF2, TRF2)
Find proteins for Q15554 (Homo sapiens)
Go to Gene View: TERF2
Go to UniProtKB:  Q15554
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Adrenocortical dysplasia protein homolog
B
40Homo sapiensMutation(s): 0 
Gene Names: ACD (PIP1, PTOP, TINT1, TPP1)
Find proteins for Q96AP0 (Homo sapiens)
Go to Gene View: ACD
Go to UniProtKB:  Q96AP0
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.202 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 46.222α = 90.00
b = 112.258β = 90.00
c = 121.209γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data scaling
HKL-2000data reduction
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-07-07 
  • Released Date: 2017-12-13 
  • Deposition Author(s): Hu, C., Chen, Y.

Funding OrganizationLocationGrant Number
National Natural Science FoundationChina31470737
Ministry of Science and Technology of ChinaChina2013CB910401

Revision History 

  • Version 1.0: 2017-12-13
    Type: Initial release