Crystal Structure of TPP1 K170del

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

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Structural and functional consequences of a disease mutation in the telomere protein TPP1.

Bisht, K.Smith, E.M.Tesmer, V.M.Nandakumar, J.

(2016) Proc Natl Acad Sci U S A 113: 13021-13026

  • DOI: https://doi.org/10.1073/pnas.1605685113
  • Primary Citation of Related Structures:  
    5I2X, 5I2Y

  • PubMed Abstract: 

    Telomerase replicates chromosome ends to facilitate continued cell division. Mutations that compromise telomerase function result in stem cell failure diseases, such as dyskeratosis congenita (DC). One such mutation (K170Δ), residing in the telomerase-recruitment factor TPP1, provides an excellent opportunity to structurally, biochemically, and genetically dissect the mechanism of such diseases. We show through site-directed mutagenesis and X-ray crystallography that this TPP1 disease mutation deforms the conformation of two critical amino acids of the TEL [TPP1's glutamate (E) and leucine-rich (L)] patch, the surface of TPP1 that binds telomerase. Using CRISPR-Cas9 technology, we demonstrate that introduction of this mutation in a heterozygous manner is sufficient to shorten telomeres in human cells. Our findings rule out dominant-negative effects of the mutation. Instead, these findings implicate reduced TEL patch dosage in causing telomere shortening. Our studies provide mechanistic insight into telomerase-deficiency diseases and encourage the development of gene therapies to counter such diseases.

  • Organizational Affiliation

    Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Adrenocortical dysplasia protein homolog
A, B
160Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q96AP0 (Homo sapiens)
Explore Q96AP0 
Go to UniProtKB:  Q96AP0
GTEx:  ENSG00000102977 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96AP0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.026α = 90
b = 119.026β = 90
c = 170.778γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesR00-CA-167644

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-09
    Type: Initial release
  • Version 1.1: 2016-11-16
    Changes: Database references
  • Version 1.2: 2016-11-30
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references
  • Version 1.4: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Refinement description