Human Triose Phosphate Isomerase Q181P

Experimental Data Snapshot

  • Resolution: 1.31 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.137 
  • R-Value Observed: 0.137 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Itavastatin and resveratrol increase triosephosphate isomerase protein in a newly identified variant of TPI deficiency.

VanDemark, A.P.Hrizo, S.L.Eicher, S.L.Kowalski, J.Myers, T.D.Pfeifer, M.R.Riley, K.N.Koeberl, D.D.Palladino, M.J.

(2022) Dis Model Mech 15

  • DOI: https://doi.org/10.1242/dmm.049261
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Triosephosphate isomerase (TPI) deficiency (TPI Df) is an untreatable glycolytic enzymopathy that results in hemolytic anemia, progressive muscular impairment and irreversible brain damage. Although there is a 'common' mutation (TPIE105D), other pathogenic mutations have been described. We identified patients who were compound heterozygous for a newly described mutation, TPIQ181P, and the common TPIE105D mutation. Intriguingly, these patients lacked neuropathy or cognitive impairment. We then initiated biochemical and structural studies of TPIQ181P. Surprisingly, we found that purified TPIQ181P protein had markedly impaired catalytic properties whereas crystallographic studies demonstrated that the TPIQ181P mutation resulted in a highly disordered catalytic lid. We propose that genetic complementation occurs between the two alleles, one with little activity (TPIQ181P) and one with low stability (TPIE105D). Consistent with this, TPIQ181P/E105D fibroblasts exhibit a significant reduction in the TPI protein. These data suggest that impaired stability, and not catalytic activity, is a better predictor of TPI Df severity. Lastly, we tested two recently discovered chemical modulators of mutant TPI stability, itavastatin and resveratrol, and observed a significant increase in TPI in TPIQ181P/E105D patient cells.

  • Organizational Affiliation

    Biological Sciences and Structural Biology, University of Pittsburgh, Pittsburgh, PA 15260, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Triosephosphate isomerase
A, B
249Homo sapiensMutation(s): 1 
Gene Names: TPI1TPI
EC: (PDB Primary Data), (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P60174 (Homo sapiens)
Explore P60174 
Go to UniProtKB:  P60174
PHAROS:  P60174
GTEx:  ENSG00000111669 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60174
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.31 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.137 
  • R-Value Observed: 0.137 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.189α = 90
b = 77.822β = 90
c = 84.295γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
autoPROCdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM103369

Revision History  (Full details and data files)

  • Version 1.0: 2022-05-04
    Type: Initial release
  • Version 1.1: 2022-11-16
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description