5I2Y

Crystal Structure of TPP1 K170A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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.USA 113: 13021-13026

  • DOI: 10.1073/pnas.1605685113
  • Primary Citation of Related Structures:  

  • 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 telomeras ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Adrenocortical dysplasia protein homolog
A, B
161Homo sapiensMutation(s): 1 
Gene Names: ACD (PIP1, PTOP, TINT1, TPP1)
Find proteins for Q96AP0 (Homo sapiens)
Go to Gene View: ACD
Go to UniProtKB:  Q96AP0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.194 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 119.197α = 90.00
b = 119.197β = 90.00
c = 171.350γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
SCALAdata scaling
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer InstituteUnited StatesR00-CA-167644

Revision History 

  • Version 1.0: 2016-11-09
    Type: Initial release
  • Version 1.1: 2016-11-16
    Type: Database references
  • Version 1.2: 2016-11-30
    Type: Database references
  • Version 1.3: 2017-09-20
    Type: Author supporting evidence, Database references